RESTATED
                          CERTIFICATE OF INCORPORATION
                                       OF
                             A. O. SMITH CORPORATION


        1.   The name of the corporation is A. O. Smith Corporation (the
   "Corporation").  The date of filing of its original Certificate of
   Incorporation with the Secretary of State of the State of Delaware was
   July 9, 1986.

        2.   This Restated Certificate of Incorporation restates and
   integrates and further amends the Certificate of Incorporation of this
   corporation to read as herein set forth in full:

                                    ARTICLE 1

        The name of the corporation is "A. O. SMITH CORPORATION."

                                    ARTICLE 2

        The address of the corporation's Registered Office in the State of
   Delaware is The Prentice-Hall Corporation System, Inc., 1013 Centre Road,
   City of Wilmington, County of New Castle.  The name of its Registered
   Agent at such address is The Prentice-Hall Corporation System, Inc.

                                    ARTICLE 3

        The nature of the business or purposes to be conducted or promoted
   are:

        (A)  1.   To manufacture, buy, sell, export, import and generally
   deal in all kinds of manufactured products and materials therefor, and in
   particular, steel and iron products and materials therefor.

             2.   To carry on the business of mining, milling, concentrating,
   converting, smelting, treating, preparing for market, manufacturing,
   buying, selling, exchanging and otherwise producing and dealing in gold,
   silver, copper, lead, zinc, brass, iron, steel and all kinds of ores,
   metals and minerals and the products and by-products thereof.  Without in
   any way limiting the foregoing to search for, prospect and explore for
   ores and minerals and to locate mining claims, grounds or lodes in the
   United States of America or the states or territories thereof or in other
   countries and record the same pursuant to the mining laws of the said
   United States or the states or territories thereof or other countries.

             3.   To manufacture, buy, sell, lease and deal in machinery for
   mining and other uses and to buy or otherwise acquire, apply for, sell,
   deal in, trade and let to lease upon rents or royalties and patents or
   patent rights on machinery, tools or equipment which may be used in mining
   and to conduct a general mining and manufacturing business.

             4.   In general, but in connection with the purposes set forth
   in this Article 3, to carry on any other business, whether manufacturing
   or otherwise, and to have and exercise all the powers conferred by the
   laws of Delaware upon secular corporations.

        (B)  To apply for, obtain, register, purchase, lease, or otherwise
   acquire, and to hold, own, use, operate and introduce, and to sell, assign
   or otherwise dispose of letters patent, licenses, trademarks, trade names,
   and any and all inventions, improvements and processes used in connection
   with, or secured under letters patent of the United States of America or
   of any other country or government and pending applications therefor,
   including any interest therein, and to grant licenses in respect thereto,
   or otherwise turn the same to the use and account of the corporation.

        (C)  To acquire by purchase, lease or otherwise, upon such terms and
   conditions and in such manner as the board of directors of the corporation
   shall determine or agree to, and to the extent which the same may be
   allowed by the Delaware General Corporation Law, all or any part of the
   property, real and personal, tangible or intangible, of any nature
   whatsoever, including the good will, business and rights of all kinds, or
   any other corporation or of any person, firm or association, which may be
   useful or convenient in the business of the corporation, and to pay for
   the same in cash, stocks, bonds or in other securities of this
   corporation, or partly in cash and partly in such stocks, bonds or in
   other securities, or in such other manner as may be agreed, and to hold,
   possess and improve such properties, and to conduct in any legal manner
   the whole or any part of the business so acquired, and to pledge,
   mortgage, sell or otherwise dispose of the same.

        (D)  To borrow money, and, from time to time, to make, accept,
   endorse, execute and issue bonds, debentures, promissory notes, bills of
   exchange and other obligations of the corporation for moneys borrowed or
   in payment for property acquired or for any of the other objects or
   purposes of the corporation or its business, and as permitted by law to
   secure the payment of any such obligations by mortgage, pledge, deed,
   indenture, agreement or other instrument of trust, or by other lien upon,
   assignment of or agreement in regard to, all or any part of the property,
   rights, privileges or franchises of the corporation wheresoever situated,
   whether now owned or hereafter to be acquired.

        (E)  To acquire by purchase, subscription or otherwise, and to hold
   and own and to sell, assign, transfer, pledge or otherwise dispose of the
   stock, or certificates of interest in shares of stocks, bonds, debentures,
   obligations and other evidences of indebtedness of any other corporation,
   domestic or foreign, and to issue in exchange therefor the stock, bonds,
   or other obligations of the corporation and while the owner of any such
   stock, certificates of interest in shares of stock, bonds, debentures,
   obligations and other evidences of indebtedness, to possess and exercise
   in respect thereof all of the rights, powers and privileges of ownership,
   including the right to vote thereon, and also in the manner, and to the
   extent, now or hereafter authorized or permitted by the laws of the State
   of Delaware, to purchase, acquire, own and hold and to dispose of (except
   as herein otherwise expressly provided) the stock, bonds or other
   evidences of indebtedness of the corporation; and to organize or cause to
   be organized under the laws of any state or other government,
   corporations, companies, associations, trusts, partnerships and other
   organizations for any lawful purpose, and to dissolve, liquidate, wind up,
   reorganize, merge or consolidate the same or cause the same to be
   dissolved, liquidated, wound up, reorganized, merged or consolidated.

        (F)  To the extent permitted by law, guarantee the payment of
   dividends on, or the payment or principal of or interest on, any stocks,
   bonds, notes, debentures, or other securities or obligations of any
   individual, corporation, company, association, trust, partnership or other
   organization in which the corporation has an interest or any of whose
   securities it owns; to the extent permitted by law, to become surety for
   and to guarantee the carrying out or performance of contracts of every
   kind and character of any individual, corporation, company, association,
   trust, partnership of other organization in which the corporation has an
   interest or any of whose securities it owns; and to aid in any lawful
   manner any individual, corporation, company, association, trust,
   partnership or other organization in which the corporation has an interest
   or any of whose securities it owns.

        (G)  To execute and deliver general or special powers of attorney to
   individuals, corporations, companies, associations, trusts, partnerships
   and other organizations, whether public or private, as the board of
   directors shall determine.

        (H)  In general to do any or all of the things hereinbefore set
   forth, and such other things as are incidental or conducive to the
   attainment of the objects and purposes of the corporation, as principal,
   factor, agent, contractor or otherwise, either alone or in conjunction
   with any person, firm, association or corporation, and in carrying on its
   business and for the purpose of attaining or furthering any of its objects
   to make and perform contracts, and to do such acts and things and to
   exercise any and all such powers to the same extent as a natural person
   might or could lawfully do to the extent allowed by law.

        (I)  To have one or more offices and to carry on its operations and
   transact its business within and without the State of Delaware, and,
   without restriction or limit as to amount, to purchase or otherwise
   acquire, hold, own, mortgage, sell, convey or otherwise dispose of real
   and personal property of every class and description in any of the states,
   districts, territories or dependencies of the United States, and in any
   and all foreign countries, subject always to the laws of such state,
   district, territory, dependency or foreign country.

        The foregoing clauses shall each be construed as both purposes and
   powers, and the matters expressed in each clause shall, except as
   otherwise expressly provided, be in no wise limited by reference to or
   inference from the terms of any other clause, but shall be regarded as
   independent purposes and powers, and the enumeration of specific purposes
   and powers shall not be construed to limit or restrict in any manner the
   meaning of general terms or the general powers of the corporation; nor
   shall the expression of one thing be deemed to exclude another, although
   it be of like nature, not expressed.

                                    ARTICLE 4

        The aggregate number of shares which the corporation has the
   authority to issue shall be seventy-seven million (77,000,000) shares,
   consisting of:

        (a)  fourteen million (14,000,000) shares designated as "Class A
   Common Stock," with a par value of Five Dollars ($5) per share;

        (b)  sixty million (60,000,000) shares designated as "Common Stock,"
   with a par value of One Dollar ($1) per share; and

        (c)  three million (3,000,000) shares designated as "Preferred
   Stock," with a par  value of One Dollar ($1) per share.

        Any and all such shares of Class A Common Stock, Common Stock and
   Preferred Stock may be issued for such consideration, not less than the
   par value thereof, as shall be fixed from time to time by the board of
   directors. Upon any distribution of authorized but unissued shares to
   stockholders, the part of the surplus of the corporation (not less than
   the par value of such shares) which is concurrently transferred to stated
   capital shall be deemed the consideration for the issue of such shares.
   Any and all such shares so issued, the full consideration for which has
   been paid, delivered or so transferred, shall be deemed fully paid stock
   and shall not be liable to any further call or assessment thereon, and the
   holders of such shares shall not be liable for any further payments except
   as otherwise provided by applicable law of the State of Delaware or any
   other state in which the corporation holds a certificate of authority to
   do business. The relative rights, preferences and limitations of each
   class shall be as follows:

   (A)  Class A Common Stock and Common Stock

        Except as provided in this Article 4, the Class A Common Stock and
   the Common stock shall have the same rights and privileges and shall rank
   equally, share ratably and be identical in all respects as to all matters.

        (1)  Dividends; Combinations; and Subdivisions.

             (a)  The holders of the Class A Common Stock and Common Stock
                  shall be entitled to receive, when and as declared by the
                  board of directors, such dividends including share
                  distributions (as defined in paragraph (A)(1)(b)) as may be
                  declared from time to time by the board of directors
                  subject to any limitations applicable by law of the State
                  of Delaware, to the rights of the holders of the Preferred
                  Stock, and to the following limitation. Whenever a dividend
                  which is not a share distribution is paid to the holders of
                  Class A Common Stock, the corporation shall also pay to the
                  holders of Common Stock a dividend per share at least equal
                  to the dividend per share paid to the holders of the Class
                  A Common Stock. The corporation may pay dividends which are
                  not share distributions to holders of Common Stock in
                  excess of dividends paid, or without paying dividends, to
                  holders of Class A Common Stock.

             (b)  If at any time a distribution is to be paid in Class A
                  Common Stock or Common Stock (a "share distribution"), such
                  share distribution may be declared and distributed only as
                  follows:

                  (i)  Shares of one class of either the Class A Common Stock
                       or the Common Stock (the "first class") may be
                       distributed on shares of that class, provided that
                       there is declared and paid a simultaneous distribution
                       of shares of the other class of stock (the "second
                       class") to the holders of the second class which
                       simultaneous distribution shall consist of a number of
                       shares of the second class equal on a per share basis
                       to the number of shares of the first class which are
                       distributed to holders of the first class.

                  (ii) Subject to any limitations of the laws of the State of
                       Delaware, shares of the first class may be distributed
                       on shares of the second class, provided that there is
                       declared and paid a simultaneous distribution of
                       shares of the first class to holders of shares of the
                       first class which simultaneous distribution shall
                       consist of a number of shares of the first class equal
                       on a per share basis to the number of shares of the
                       first class which are distributed to holders of the
                       second class.

             (c)  The corporation shall not combine or subdivide shares of
                  the first class without making a simultaneous combination
                  or subdivision of shares of the second class which is equal
                  on a per share basis to the combination or subdivision of
                  the shares of the first class.

   (2)  Voting.

        Voting power shall be divided between the Class A Common Stock and
   the Common Stock as follows:

        (a)  With respect to the election of directors, holders of the Common
             Stock, voting as a separate class, shall be entitled to elect
             that number of directors which constitutes 25% of the authorized
             number of members of the board of directors and, if such 25% is
             not a whole number, then the holders of the Common Stock shall
             be entitled to elect to the nearest higher whole number of
             directors that is at least 25% of such membership. Holders of
             Class A Common Stock, voting as a separate class but subject to
             any voting rights which may be granted to holders of Preferred
             Stock, shall be entitled to elect the remaining directors.

        (b)  The holders of Class A Common Stock shall be entitled to vote as
             a separate class but subject to any voting rights which may be
             granted to holders of Preferred Stock, on the removal with or
             without cause, of any director elected by the holders of Class A
             Common Stock, and the holders of Common Stock shall be entitled
             to vote as a separate class on the removal, with or without
             cause, of any director elected by the holders of Common Stock.

        (c)  In the discretion of the board of directors, (i) any vacancy in
             the office of a director elected by the holders of the Class A
             Common Stock may be filled by a vote of such holders, voting as
             a separate class but subject to any voting rights which may be
             granted to holders of Preferred Stock, and any vacancy in the
             office of a director elected by the holders of the Common Stock
             may be filled by a vote of such holders, voting as a separate
             class, or (ii) in the case of a vacancy in the office of a
             director elected by either class, such vacancy may be filled by
             the remaining directors. Any director elected by the board of
             directors to fill a vacancy shall serve until the next Annual
             Meeting of Stockholders and until his successor has been elected
             and has qualified. If permitted by the By-Laws, the board of
             directors may (i) increase the number of directors and any
             vacancy so created may be filled by the board of directors, or
             (ii) decrease the number of directors; provided that, so long as
             the holders of Common Stock had the rights provided in paragraph
             (A)(2)(a) of this Article 4 in respect of the last Annual
             Meeting of Stockholders, the board of directors may be so
             enlarged (or so decreased) only to the extent that at least 25%
             of the enlarged (or decreased) board consists of directors
             elected by the holders of the Common Stock or by directors
             appointed to fill vacancies created by the death, resignation or
             removal of directors elected by the holders of the Common Stock.

        (d)  The Common Stock will not have the right to elect directors set
             forth in paragraphs (A)(2)(a) and (A)(2)(c) of this Article 4,
             if, on the record date of any stockholder meeting at which
             directors are to be elected, the number of issued and
             outstanding shares of Common Stock is less than 10% of the
             aggregate number of issued and outstanding shares of Class A
             Common Stock and Common Stock.  In such case, all directors to
             be elected at such meeting shall be elected by holders of Class
             A Common Stock and Common Stock, voting together as a single
             class but subject to any voting rights which may be granted to
             holders of Preferred Stock, provided that with respect to said
             election, the holders of Class A Common Stock shall have one
             vote per share and holders of Common Stock shall have one-tenth
             vote per share. The Class A Common Stock will not have the right
             to elect directors set forth in paragraphs (A)(2)(a) and
             (A)(2)(c) of this Article 4, if, on the record date for any
             stockholder meeting at which directors are to be elected, the
             number of issued and outstanding shares of Class A Common Stock
             is less than 12.5% of the aggregate number of issued and
             outstanding shares of Class A Common Stock and Common Stock. In
             such case, holders of Common Stock, voting as a separate class,
             shall have the right to elect 25% of the members of the board of
             directors as provided in paragraph (A)(2)(a) of this Article 4,
             and holders of Class A Common Stock and Common Stock voting
             together as a separate class but subject to any voting rights
             which may be granted to holders of Preferred Stock, shall be
             entitled to elect the remaining directors, provided that with
             respect to said election, the holders of Class A Common Stock
             shall have one vote per share and the holders of Common Stock
             shall have one-tenth vote per share.

        (e)  Subject to the provisions of section (D) of this Article 4, the
             holders of Class A Common Stock and Common Stock shall in all
             matters not specified in paragraphs (A)(2)(a), (b), (c) and (d)
             of this Article 4 vote together as a single class but subject to
             any voting rights which may be granted to holders of Preferred
             Stock, provided that the holders of Class A Common Stock shall
             have one vote per share and the holders of Common Stock shall
             have one-tenth vote per share.

        (f)  Notwithstanding anything in this subsection (A)(2) or in section
             (D) of this Article 4 to the contrary but subject to any voting
             rights which may be granted to holders of Preferred Stock, the
             holders of Class A Common Stock shall have exclusive voting
             power on all matters, at any time when no Common Stock is issued
             and outstanding, and the holders of Common Stock shall have
             exclusive voting power on all matters at any time when no Class
             A Common Stock is issued and outstanding.

   (3)  Conversion.

        (a)  The holder of any shares of Class A Common Stock at his option
             will be entitled at any time to convert each share of Class A
             Common Stock into one share of Common Stock.  Such right shall
             be exercised by the surrender of the shares of Class A Common
             Stock so to be converted to the corporation at any time during
             normal business hours at the office or agency then maintained by
             it for payment of dividends on the shares of the Class A Common
             Stock and the Common Stock (the "Payment Office"), accompanied
             by written notice of such holder's election to convert and (if
             so required by the corporation or any conversion agent) by
             instruments of transfer, in form satisfactory to the corporation
             and to any conversion agent, duly executed by the registered
             holder or by his duly authorized attorney.

        (b)  As promptly as practicable after the surrender for conversion of
             any shares of Class A Common Stock in the manner provided in
             paragraph A(3)(a) of this Article 4, the corporation will
             deliver or cause to be delivered at the Payment Office to or
             upon the written order of the holder of such shares,
             certificates representing the number of full shares of Common
             Stock issuable upon such conversion, issued in such name or
             names as such holder may direct. Such conversion shall be deemed
             to have been made immediately prior to the close of business on
             the date of such surrender of the shares of Class A Common
             Stock, and all rights of the holder of such shares as a holder
             of such shares shall cease at such time and the person or
             persons in whose name or names the certificates for shares of
             Common Stock are to be issued shall be treated for all purposes
             as having become the record holder or holders thereof at such
             time; provided, however, that any such surrender on any date
             when the stock transfer books of the corporation shall be closed
             shall constitute the person or persons in whose name or names
             the certificates for such shares of Common Stock are to be
             issued as the record holder or holders thereof for all purposes
             immediately prior to the close of business on the next
             succeeding day on which such stock transfer books are opened.

        (c)  No adjustments in respect of dividends shall be made upon the
             conversion of any shares of the Class A Common Stock; provided,
             however, that if shares of Class A Common Stock shall be
             converted subsequent to the record date preceding a dividend
             payment on the Class A Common Stock but prior to the payment
             date for such dividend, the registered holder of such shares of
             Class A Common Stock at the close of business on such record
             date nonetheless shall be entitled to receive the dividend paid
             on such shares, if any, on such payment date notwithstanding the
             conversion thereof.

        (d)  The corporation covenants that it will at all times reserve and
             keep available, solely for the purpose of issue upon conversion
             of the shares of Class A Common Stock, such number of shares of
             Common Stock as shall be issuable upon the conversion of all
             such outstanding shares of Class A Common Stock, provided, that
             nothing contained herein shall be construed to preclude the
             corporation from satisfying its obligations in respect of the
             conversion of the shares of Class A Common Stock by delivery of
             shares of Common Stock which are held in the treasury of the
             corporation.

             The corporation covenants that all shares of Common Stock which
             shall be issued upon conversion of the shares of the Class A
             Common Stock will upon issue be fully paid and non-assessable
             and not subject to any preemptive rights, except as otherwise
             required by applicable law.

   (B) Preferred Stock

        (1)  Series of Preferred Stock

                  The board of directors shall have authority, by resolution
             or resolutions, to divide the Preferred Stock into series, to
             establish and designate each such series and the number of
             shares thereof (which number, by like action of the board of
             directors from time to time thereafter, may be increased except
             when otherwise provided by the board of directors in creating
             such series, or may be decreased but not below the number of
             shares thereof then outstanding), and to determine and fix the
             rights, preferences and limitations in respect of the shares of
             each series established prior to the issuance thereof, and the
             relative variations therein as between series, to the fullest
             extent now or hereafter permitted by applicable law of the State
             of Delaware, and (without limiting the generality of the
             foregoing) particularly with respect to:

             (a)  The rate of dividend and the initial original issue date or
                  other date from which such dividends shall be cumulative;

             (b)  The price or prices, at the period or periods within, and
                  the terms and conditions on which shares may or shall be
                  redeemed;

             (c)  The amounts payable upon shares in the event of voluntary
                  liquidation or involuntary liquidation;

             (d)  The terms of the sinking fund provisions or redemption or
                  purchase account, if any, for the redemption or purchase of
                  shares;

             (e)  The terms and conditions on which shares may be converted
                  into shares of Class A Common Stock or Common Stock, if the
                  shares of any series are issued with the privilege of
                  conversion; and

             (f)  Whether or not shares shall have voting powers, and the
                  terms and conditions upon which any voting powers may be
                  exercised; provided that, so long as any Common Stock is
                  outstanding, no Preferred Stock with voting powers shall
                  have more than one vote per share nor shall any such
                  Preferred Stock be entitled to vote with the Common Stock
                  in the election of 25% of the members of the board of
                  directors pursuant to paragraph (A)(2)(a) of this Article
                  4, on the removal of directors elected by holders of Common
                  Stock pursuant to paragraph (A)(2)(b) of this Article 4, or
                  in the filling of vacancies in the office of a director
                  elected by holders of Common Stock pursuant to paragraph
                  (A)(2)(d) of this Article 4.

        Except as to the matters in respect to which variations are permitted
   under this subsection (B)(1), all series of the Preferred Stock of the
   corporation, whenever designated and issued, shall have the same rights,
   preferences and limitations and shall rank equally, share ratably and be
   identical in all respects as to all matters.

        All shares of any one series of Preferred Stock established as
   hereinabove authorized shall be alike in every particular, and each series
   thereof shall be distinctively designated by letter or descriptive words
   or figures.

        Any shares of Preferred Stock reacquired by the corporation by
   purchase or redemption, through conversion, or through the operation of
   any sinking fund or redemption or purchase account and which are
   thereafter cancelled shall have the status of authorized but unissued
   shares of Preferred Stock of the corporation, and, subject to the
   provisions of any series of the Preferred Stock, may thereafter be
   reissued as part of the same series or may be reclassified and reissued by
   the board of directors in the same manner as any other authorized but
   unissued shares of Preferred Stock

        (2)  Dividends.

                  Before any dividends, other than stock dividends, shall be
             paid or set apart for payment upon either the Class A Common
             Stock or the Common Stock, the holders of Preferred Stock shall
             be entitled to receive dividends at the rate per annum specified
             as to each series pursuant to paragraph (B)(1)(a), payable
             quarter-annually when and as declared by the board of directors.

                  Except as otherwise provided with respect to a particular
             series pursuant to paragraph (B)(1)(a), dividends shall accrue,
             in the case of shares of each particular series:

             (i)  if issued prior to the record date for the first dividend
             on shares of such series, then from the date of initial original
             issue of shares of such series;

             (ii) if issued during the period commencing immediately after
             the record date for a dividend on shares of such series and
             terminating at the close of the payment date for such dividend,
             then from such last mentioned dividend payment date; and

             (iii)  otherwise from the quarterly dividend payment date
             next preceding the date of original issue of such shares;

             provided, that if the date of initial original issue of shares
             of any series shall be within thirty (30) days prior to the date
             when the first quarter-annual dividend would otherwise be
             payable, the board of directors may provide that such first
             dividend shall be payable only at the time of payment of the
             dividend for the next quarter-annual period, in which case no
             deficiency in payment of such first dividend shall exist by
             reason of such deferral.

        All dividends of Preferred Stock shall be cumulative so that if the
   corporation shall not pay the quarterly dividend, or any part thereof, on
   the Preferred Stock then issued and outstanding, such deficiency in the
   dividend on the Preferred Stock shall thereafter be fully paid, but
   without interest, before any cash dividend shall be paid or set apart for
   payment on either the Class A Common Stock or the Common Stock.

        Any dividend paid upon the Preferred Stock at a time when any accrued
   dividends for any prior period are delinquent shall be expressly declared
   as a dividend in whole or partial payment of the accrued dividend for the
   earliest period for which dividends are then delinquent, and shall be so
   designated to each shareholder to whom payment is made.

        All shares of Preferred Stock shall rank equally and shall share
   ratably, in proportion to the rate of dividend fixed pursuant to paragraph
   (B)(1)(a) in respect to each such share, in all dividends paid or set
   aside for payment for any dividend period or part thereof upon any such
   shares.

        (3)  Liquidation, Dissolution or Winding Up.

                  In case of voluntary or involuntary liquidation,
             dissolution or winding up of the corporation, the holders of
             shares of each series of Preferred Stock shall be entitled to
             receive out of the assets of the corporation in money or money's
             worth the applicable amount specified pursuant to paragraph
             (B)(1)(c) with respect to that series of Preferred Stock,
             together with all accrued but unpaid dividends thereon (whether
             or not earned or declared), before any of such assets shall be
             paid or distributed to holders of Class A Common Stock or Common
             Stock, and if the assets of the corporation shall be
             insufficient to pay the holders of all of the Preferred Stock
             then outstanding the entire amounts to which they may be
             entitled, the holders of each outstanding series of the
             Preferred Stock shall share ratably in such assets in proportion
             to the amounts which would be payable with respect to such
             series if all amounts payable thereon were paid in full. The
             consolidating or merger of the corporation with or into any
             other corporation or corporations, or the merger of any other
             corporation or corporations into the corporation, in pursuance
             of the laws of the State of Delaware and of any other applicable
             state providing for consolidation or merger, shall not be deemed
             a liquidation, dissolution or winding up of the affairs of the
             corporation within the meaning of the foregoing provisions of
             this subsection (B)(3), unless otherwise provided pursuant to
             paragraph (B)(1)(c).

   (C) Preemptive Rights.

        No holder of Preferred, Class A Common Stock or Common Stock shall be
   entitled, as of right because of his ownership of such stock, to subscribe
   for, purchase or receive any part of any new or additional issue of stock,
   whether Preferred Stock, Class A Common Stock or Common Stock, or of
   bonds, debentures or other securities convertible into stock, or any part
   of any reacquired shares or convertible securities held in treasury, but
   all such shares of stock or bonds, debentures or other securities
   convertible into stock may be issued and disposed of by the board of
   directors to such person or persons and on such terms and for such
   consideration (so far as may be permitted by law) as the board of
   directors in its absolute discretion may deem advisable. The provisions of
   this section (C) shall not impair any conversion right of any such
   convertible securities or any other right authorized by the board of
   directors to purchase or exchange, or to receive any distribution of, any
   securities of the corporation.

   (D) Special Voting Rights of Stockholders

        (1)  Subject to the voting rights of holders of Preferred Stock as
             may be established pursuant to subsection (B)(1) of this Article
             4, the holders of Class A Common Stock and the holders of Common
             Stock shall be entitled to vote, and to vote as separate
             classes, upon the authorization of any amendment to this
             Certificate of Incorporation, and, in addition to the
             authorization of any such amendment by vote of a majority of the
             total number of votes represented by all outstanding shares
             entitled to vote thereon, the amendment shall be authorized by
             vote of a majority of the total number of votes represented by
             all outstanding shares of the Class A Common Stock and/or the
             Common Stock if such amendment contains any provision which
             would:

             (a)  exclude or limit their right to vote on any matter, except
                  as such right may be limited by voting rights given to new
                  shares then being authorized of any existing or new class
                  or series,

             (b)  reduce the par value of their shares; or change their
                  shares into a different number of shares of the same class
                  or into the same or a different number of shares of any one
                  or more classes or any series thereof, either with or
                  without par value; or fix, change or abolish the
                  designation or any of the relative rights, preferences and
                  limitations of their shares, including any provision in
                  respect to any undeclared dividends, whether or not
                  cumulative or accrued, or the redemption of any shares, or
                  any sinking fund for the redemption or purchase of their
                  shares, or any preemptive right to acquire shares or other
                  securities; or alter the terms or conditions upon which
                  their shares are convertible or change the shares issuable
                  upon conversion of their shares; if any such action would
                  adversely affect such holders, or

             (c)  subordinate their rights, by authorizing shares having
                  preferences which would be in any respect superior to those
                  rights.

        (2)  Any plan of merger or consolidation shall be adopted at a
             meeting of stockholders by a vote of two-thirds of the total
             number of votes represented by the outstanding shares entitled
             to vote thereon. The holders of shares of a class or series
             shall be entitled to vote and to vote as a class if the plan of
             merger or consolidation contains any provision which, if
             contained in an amendment to the Certificate of Incorporation,
             would entitle the holders of shares of such class or series to
             vote and vote as a class thereon pursuant to subsection (D)(1)
             of this Article 4. In such case, in addition to the
             authorization of the plan of merger or consolidation by vote of
             two-thirds of the total number of votes represented by all
             outstanding shares entitled to vote thereon, the plan of merger
             or consolidation shall be authorized by vote of the majority of
             the total number of votes represented by all outstanding shares
             entitled to vote thereon. Any plan of merger or consolidation of
             any subsidiary corporation or corporations, whether domestic or
             foreign, with and into the corporation shall not be subject to
             the provisions of this subsection (D)(2) if the corporation owns
             at least ninety percent of the outstanding shares of each class
             of capital stock of such subsidiary corporation or corporations.

                  For the purposes of this subsection (D)(2), the financial
             or other effect of any merger or consolidation on the
             corporation shall not be deemed to affect adversely the powers,
             preferences or rights of any class or series of stock.

        (3)  Any sale, lease, exchange or other disposition of all or
             substantially all the assets of the corporation, if not made in
             the usual or regular course of the business actually conducted
             by the corporation shall be authorized by vote at a meeting of
             stockholders of two-thirds of the total number of votes
             represented by all outstanding shares entitled to vote thereon.

        (4)  Any amendment to the Certificate of Incorporation of the
             corporation which adds a provision specifying that any
             stockholders, or the holders of any specified number or
             proportion of shares, or of any specified number or proportion
             of shares of any class or series thereof, may require the
             dissolution of the corporation at will or upon the occurrence of
             a specified event, or which changes or strikes out such a
             provision, shall be authorized at a meeting of stockholders by a
             vote of a majority of the total votes represented by all
             outstanding shares, whether or not otherwise entitled to vote on
             any such amendment.

        (5)  Any amendment to the Certificate of Incorporation of the
             corporation which changes or strikes out any provision
             specifying that the proportion of shares, or the proportion of
             shares of any class or series thereof, the holders of which
             shall be present in person or by proxy at any meeting of
             stockholders in order to constitute a quorum for transaction of
             any business or of any specified item of business, including
             amendments to this Certificate of Incorporation shall be greater
             than the proportion prescribed by law in the absence of such
             provision, or any provision specifying that the proportion of
             votes of the holders of shares, or of the holders of shares of
             any class or series thereof, that shall be necessary at any
             meeting of stockholders for the transaction of any business or
             of any specified item of business, including amendments to this
             Restated Certificate of Incorporation, shall be greater than
             such proportion prescribed by law in the absence of such
             provision, shall be authorized at a meeting of stockholders by
             vote of two-thirds of the total number of votes represented by
             all outstanding shares entitled to vote thereon.

                                    ARTICLE 5

        The duration of the corporation is to be perpetual.

                                    ARTICLE 6

        The number of directors of the corporation shall be not less than
   five nor more than such number as shall be fixed by resolution of the
   board of directors from time to time.

                                    ARTICLE 7

        The board of directors shall have the following powers, in addition
   to those prescribed by law or by the By-Laws of the corporation;

        (A)  To make, alter, amend and repeal the By-Laws of the corporation,
   to the extent permitted by the law of Delaware.

        (B)  To elect or appoint from among their number an Executive
   Committee, which committee, to the extent and in the manner provided in
   the By-Laws of the corporation, shall have and may exercise all the powers
   of the board of directors, in the management of the business and affairs
   of the corporation, during the intervals between the meetings of the board
   of directors, so far as may be permitted by law, and such other standing
   committees as the board from time to time may determine to elect to
   appoint, which committees shall have and may exercise such powers as may
   be prescribed in the By-Laws or delegated to them by the board.

        (C)  From time to time to determine, so far as permitted by law,
   whether and to what extent, and at what time and places and under what
   conditions and regulations the accounts and books of the corporation, or
   any of them, shall be open to the inspection of stockholders, and no
   stockholder shall have any right to inspect any book or account or
   document of the corporation except as conferred by the laws of the State
   of Delaware or authorized by the board of directors.

        (D)  Subject to the provisions of the laws of the State of Delaware
   to hold their meetings either within or without the State of Delaware, to
   have one or more offices, and to keep the books of the corporation (except
   such books as are required by law to be kept at the office of the
   corporation in the State of Delaware) outside of the State of Delaware,
   and at such place or places as may from time to time be designated by
   them.

        (E)  To elect or appoint such officers, and to provide that the
   persons so elected or appointed shall have and may exercise such powers as
   may be prescribed from time to time by the By-Laws of the corporation.

                                    ARTICLE 8

        The corporation reserves the right to amend, alter, change or repeal
   any provision herein contained, in the manner now or hereafter prescribed
   by law, and all rights conferred on stockholders hereunder are granted
   subject to this provision.

                                    ARTICLE 9

        No director of the corporation shall be liable to the corporation or
   its stockholders for monetary damages for breach of fiduciary duty as a
   director, except for liability (i) for any breach of the director's duty
   of loyalty to the corporation or its stockholders, (ii) for acts or
   omissions not in good faith or which involve intentional misconduct or a
   knowing violation of law, (iii) under Section 174 of the Delaware General
   Corporation Law, or (iv) for any transaction from which the director
   derived an improper personal benefit.

        3.   The amendment and restatement of the Certificate of
   Incorporation herein certified have been duly adopted by the stockholders
   as of January 26, 1993 in accordance with the provisions of Sections 242
   and 245 of the General Corporation Law of the State of Delaware.

        IN WITNESS WHEREOF, A. O. Smith Corporation has caused this Restated
   Certificate to be signedby Robert J. O'Toole, its President and attested
   by W. David Romoser, its Secretary, this 5th day of February, 1996.

                                      A. O. SMITH CORPORATION


                                  By:      /s/ Robert J. O'Toole       
                                      Robert J. O'Toole, President

   ATTEST:

   By:     /s/ W. David Romoser        
        W. David Romoser, Secretary