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                               Exhibit 10a

                      1988 INCENTIVE STOCK OPTION PLAN
                        OF TWIN DISC, INCORPORATED


     (1)     PURPOSE  The purpose of this incentive stock option plan
(hereinafter called "Plan") is to secure for Twin Disc, Incorporated
(hereinafter called "Company") the benefits which result from providing
present or future officers and key employees of the Company with the
performance incentives inherent in common stock ownership. This Plan is
expected to benefit the Company's shareholders by enabling the Company to
attract and retain qualified management personnel, to provide incentive
compensation to such personnel, and to encourage such personnel to acquire
or increase their proprietary interests in the Company. It is intended that
options issued pursuant to this Plan shall constitute incentive stock options
within the meaning of Section 422A of the Internal Revenue Code of 1986, as
amended.

     (2)     STOCK  The total number of shares of common stock to be subject
to options upon the exercise of options granted under this Plan will not
exceed 125,000 shares of the Company's common stock, subject to adjustment as
provided in Paragraph 9(a) hereof. Such shares may be authorized and unissued
shares of common stock which have been reacquired by the Company, or a
combination thereof. Shares subject to an option under this Plan which is not
exercised in full, or shares as to which the right to purchase is forfeited
through default or otherwise, shall remain available for other options under
this Plan.

     (3)     ELIGIBILITY  An option may be granted to any officer or key
employee of the Company (hereinafter called "Eligible Participant").

     (4)     MAXIMUM CALENDAR YEAR GRANT TO ANY EMPLOYEE  The aggregate fair
market value (determined at the time an option is granted) of the stock for
which an Eligible Participant may be granted incentive stock options first
exercisable in any calendar year shall not exceed $100,000.

     (5) ADMINISTRATION

         (a)  This Plan will be administered by a committee (hereinafter called
         "Committee") of not less than three (3) non-officer directors, who
         shall be appointed and serve at the pleasure of the Board of
         Directors.

         (b)  A majority of the Committee shall constitute a quorum, and acts
         of a majority at any meeting at which a quorum is present, or acts
         approved in writing by a majority of the Committee shall be deemed the
         acts of the Committee.

         (c)  The Committee shall select one of its members as Chairman. The
         Committee shall appoint a Secretary, who shall maintain a record of
         its actions, decisions and proceedings. The Committee shall have the
         authority to grant options, and subject to the express provisions of
         this Plan:

            (1)  Determine the number of shares subject to each option and the
            terms thereof;
            (2)  Prescribe rules and regulations from time to time for
            administration of this Plan;
            (3) Decide any questions arising as to the interpretation or
            application of any provision of this Plan.

         (d)  No member of the Board of Directors or the Committee shall be
         liable for any action or determination made in good faith with respect
         to the Plan or any option granted under it.

     (6)     OPTION PRICE  Each option shall state the option price, which
shall be not less than the fair market value of such stock at the date of grant
of the option, unless an optionee (hereinafter called "Participant") owns more
than ten percent (10%) of the total combined voting power of all classes of the
Company's stock, in which case the option price shall be at least one hundred
ten percent (110%) of the fair market value of the such stock. The fair market
value of the stock at the date of grant shall be the closing price of the stock
on the business day preceding the date of grant on the principal stock exchange
on which the Company's stock is then listed.

     (7)     TERMS OF OPTION  Options shall be exercisable upon the terms and
conditions set forth below. Each option granted under this Plan shall be
evidenced by an agreement between the Company and the Participant, and shall
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contain, in such form and with such other provisions as the Committee shall
from time to time approve and determine, provisions to the following effect:

         (a)  An option shall be nontransferable and may be exercised only by
         the Participant during the Participant's lifetime. A Participant shall
         have the right upon his death to transfer options granted to him,
         either by will or under the laws of intestate succession, subject to
         the provisions of Paragraph 7(b)(2) hereof.

        (b)

            (1)  If a Participant's employment by the Company is terminated for
            any reason other than death or disability, the Participant may,
            within the ninety (90) days after termination, exercise any rights
            under any option theretofore granted to the Participant which the
            Participant would have been entitled to exercise on the date of
            such determination.
            (2)  If a Participant's employment by the Company is terminated by
            death, the person or persons to whom any option theretofore granted
            to the Participant passes, pursuant to his will or under the laws
            of intestate succession, may exercise any rights under any option
            theretofore granted to the Participant which the Participant would
            have been entitled to exercise on the date of his death, but such
            exercise must be made within one year of the death of the
            Participant. If the termination is due to disability, the
            Participant may exercise the option within one (1) year form the
            date of such termination.
            (3)  To the extent any option has not yet become exercisable on the
            date a Participant's employment is terminated, such option shall
            automatically terminate.

        (c)  An option must be exercised within ten (10) years of its grant,
        unless the Participant owns more than ten percent (10%) of the total
        combined voting power of all classes of the Company's stock, in which
        case it must be exercised within five (5) years its grant.

        (d)  An option shall be exercised by delivering to the Chief Financial
        Officer of the Company at its principal business office a written
        notice designating the number of shares for which it is being
        exercised. Payment in full for the number of shares for which the
        option is being exercised must accompany such notice.

     (8)     SHARES ACQUIRED ON EXERCISE OF OPTION

        (a)  At the time of exercise, unless the shares acquired are the
        subject of an effective registrations statement, a Participant shall
        be required to give a written representation that he is acquiring such
        shares for his own account and for purposes of investment, and not with
        a view to, or for sale in connection with, the distribution of such
        shares, nor with any present intention of distributing such shares. The
        Participant shall further acknowledge his understanding that such
        shares are not registered under the Securities Act of 1933, as amended,
        on the ground that the issuance of shares pursuant to the exercise of
        an option granted pursuant to this Plan is exempt from registration as
        not involving any public offering, and that the Company's reliance on
        such exemption is in part based on the foregoing representation. The
        Participant shall further agree that he will not sell or transfer any
        shares purchased through exercise of an option until a registration
        statement covering the shares is effective, or until he receives an
        opinion by the Company's counsel that a proposed sale or transfer will
        not violate the Securities Act of 1933, as amended, or until he obtains
        a no-action letter from the Securities Exchange Commission with respect
        thereto.

        (b)  Unless shares acquired are covered by an effective registration
        statement, their certificates shall bear an appropriate legend
        restricting their transfer.

     (9)     MISCELLANEOUS

        (a)  In the event any stock dividend, subdivision, stock split,
        combination of shares, reclassification, recapitalization, or if the
        Company shall participate in a merger or consolidation in which the
        Company is the surviving corporation, or if other similar change in the
        capitalization of the Company occurs affecting its common stock, the
        Committee shall make corresponding adjustments in(1) the number of
        shares and the price per share applicable to the outstanding options,
        (2) the number of shares then reserved for award under options
        thereafter to be granted, and (3) applicable limitations set forth in
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        this Plan with respect to the granting of options.

        (b)  No fractional shares of stock shall be issued upon the exercise of
        any option and the Company shall not be under any obligation to
        compensate any Participant for fractional shares.

        (c)  This Plan does not impose on the Company an obligation to continue
        the employment of any Participant or Eligible Participant.

        (d)  No Participant shall have any rights as a shareholder of the
        Company with respect to any shares for which he has an option to
        purchase until issuance to him of a certificate representing such
        shares.


     (10)     EFFECTIVE DATE OF PLAN  This plan shall become effective upon the
later of the date of adoption by the Board of Directors of the Company or the
date of ratification by the Company's shareholders, subject to compliance with
all applicable laws.

     (11)     TERM OF PLAN  Options may be granted pursuant to this Plan form
time to time within a period of ten (10) years from the effective date of the
Plan.