<Page>

Exhibit 5.1

<Table>

53rd at Third
885 Third Avenue
New York, New York 10022-4802
Tel: (212) 906-1200 Fax: (212) 751-4864
www.lw.com

[LATHAM & WATKINS LLP LOGO]
FIRM / AFFILIATE OFFICES
Boston New Jersey
Brussels New York
Chicago Northern Virginia
Frankfurt Orange County
May 15, 2003 Hamburg Paris
Hong Kong San Diego
London San Francisco
Los Angeles Silicon Valley
Milan Singapore
Moscow Tokyo
Washington, D.C.
</Table>

Rexnord Corporation
and each co-registrant to
Registration Statement No. 333-102428
4701 Greenfield Avenue
Milwaukee, WI 53214

Re: REGISTRATION STATEMENT ON FORM S-4 (NO. 333-102428) RELATING
TO $225,000,000 AGGREGATE PRINCIPAL AMOUNT OF 10-1/8% SENIOR
SUBORDINATED NOTES DUE 2012

Ladies and Gentlemen:

In connection with the registration of $225,000,000 aggregate
principal amount of 10-1/8% Senior Subordinated Notes due 2012 (the
"Securities") by Rexnord Corporation, a Delaware corporation (the "Company"),
and each co-registrant thereto, and the guarantees of the Securities (the
"Guarantees") by each of the entities listed on Schedule A hereto (the
"Guarantors"), under the Securities Act of 1933, as amended (the "Act"), on
Form S-4 filed with the Securities and Exchange Commission (the "Commission")
on January 9, 2003, and amended on March 19, 2003, April 17, 2003, May 14,
2003 and May 15, 2003 (File No. 333-102428) (the "Registration Statement"),
you have requested our opinion with respect to the matters set forth below.
The Securities and the Guarantees will be issued pursuant to an indenture
dated as of November 25, 2002 (the "Indenture") by and among the Company,
each of the Guarantors and Wells Fargo Bank Minnesota, National Association,
as Trustee (the "Trustee"). The Securities and the Guarantees will be issued
in exchange for the Company's outstanding 10-1/8% Senior Subordinated Notes
due 2012 on the terms set forth in the prospectus contained in the
Registration Statement and the Letter of Transmittal filed as an exhibit
thereto. The Indenture, the Securities and the Guarantees are sometimes
referred to herein collectively as the "Operative Documents." Capitalized
terms used herein without definition have the meanings assigned to them in
the Indenture.

In our capacity as your special counsel in connection with such
registration, we are familiar with the proceedings taken by the Company and each
of the Guarantors incorporated in the State of Delaware or the State of New York
(the "Covered Guarantors") in connection with the authorization and issuance of
the Securities and the Guarantees, respectively. In addition, we have made such
legal and factual examinations and inquiries, including an examination of
originals or copies certified or otherwise identified to our satisfaction of
such documents, corporate records and instruments, as we have deemed necessary
or appropriate for purposes of this opinion.

<Page>

MAY 15, 2003
PAGE 2

[LATHAM & WATKINS LLP LOGO]

In our examination, we have assumed the genuineness of all signatures,
the authenticity of all documents submitted to us as originals, and the
conformity to authentic original documents of all documents submitted to us as
copies.

We are opining herein as to the effect on the subject transaction only
of the federal laws of the United States, the internal laws of the State of New
York and the General Corporation Law of the State of Delaware, except that in
paragraph (3) we are passing upon the laws of the State of Nebraska solely in
reliance on the opinion of Fitzgerald, Schorr, Barmettler & Brennan, P.C.,
L.L.O., in paragraph (4) we are passing upon the laws of the State of Louisiana
solely in reliance on the opinion of Sher, Garner, Cahill, Richter, Klein,
McAllister and Hilbert L.L.C., in paragraph (5) we are passing upon the laws of
the State of Nevada solely in reliance on the opinion of Hale Lane Peek Dennison
and Howard, in paragraph (6) we are passing upon the laws of the State of
Wisconsin solely in reliance on the opinion Quarles & Brady LLP. Such opinions
are attached hereto as Exhibits A through D, respectively, and our opinions
herein in reliance on such opinions are subject to all of the assumptions,
limitations and qualifications set forth therein. We express no opinion with
respect to the applicability thereto, or the effect thereon, of the laws of any
other jurisdiction or, in the case of the State of Delaware, any other laws, or
as to any matters of municipal law or the laws of any local agencies within any
state.

Subject to the foregoing and the other matters set forth herein, it is
our opinion that as of the date hereof:

(1) The Securities have been duly authorized by all necessary corporate
action of the Company, and when executed, authenticated and delivered
by or on behalf of the Company against payment therefor in accordance
with the terms of the Indenture, will constitute the legally valid and
binding obligations of the Company, enforceable against the Company in
accordance with their terms.

(2) Each of the Guarantees to be executed and delivered by each of the
Covered Guarantors has been duly authorized by all necessary corporate
action of the respective Covered Guarantor and each Guaranty has been
duly executed and delivered by each Covered Guarantor.

(3) The Guaranty to be executed and delivered by Addax, Inc. set forth
in the Indenture has been duly authorized by all necessary corporate
action of such Guarantor, and such Guaranty has been duly executed and
delivered by such Guarantor.

(4) The Guaranty by Prager Incorporated set forth in the Indenture has
been duly authorized by all necessary corporate action of such
Guarantor, and such Guaranty has been duly executed and delivered by
such Guarantor.

(5) The execution and delivery of the Indenture in which the Guarantees
issued by Rexnord, Ltd. and Rexnord Puerto Rico Inc. are set forth have
been duly authorized by all necessary corporate action of each such
Guarantor and the Indenture has been duly executed and delivered by
each such Guarantor.

<Page>

MAY 15, 2003
PAGE 3

[LATHAM & WATKINS LLP LOGO]

(6) The Guaranty by Betzdorf Chain Company Inc. set forth in the
Indenture has been duly authorized by all necessary corporate action
of such Guarantor and such Guaranty set forth in the Indenture has
been duly executed and delivered by such Guarantor.

(7) Each of the Guarantees are the legally valid and binding obligation
of the respective Guarantor, enforceable against the respective
Guarantor in accordance with its terms.

The opinions rendered in paragraphs (1) and (7) relating to the
enforceability of the Securities and the Guarantees are subject to the following
exceptions, limitations and qualifications: (i) the effect of bankruptcy,
insolvency, reorganization, fraudulent transfer, moratorium or other similar
laws now or hereafter in effect relating to or affecting the rights and remedies
of creditors; (ii) the effect of general principles of equity, whether
enforcement is considered in a proceeding in equity or law, and the discretion
of the court before which any proceeding therefor may be brought; and (iii) the
unenforceability under certain circumstances under law or court decisions of
provisions for the indemnification of or contribution to a party with respect to
a liability where such indemnification or contribution is contrary to public
policy.

To the extent that the obligations of the Company and the Guarantors
under the Operative Documents may be dependent upon such matters, we assume for
purposes of this opinion that with respect to the Trustee, each Operative
Document to which it is a party constitutes its legally valid and binding
agreement, enforceable against it in accordance with its terms.

We consent to your filing this opinion as an exhibit to the
Registration Statement and to the reference to our firm contained under the
heading "Legal Matters" contained in the prospectus contained therein.

Very truly yours,

/s/ Latham & Watkins LLP

<Page>

MAY 15, 2003
PAGE 4

[LATHAM & WATKINS LLP LOGO]

SCHEDULE A

NAME JURISDICTION

1. PT Components Inc. Delaware
2. RAC-I Inc. Delaware
3. RBS Acquisition Corporation Delaware
4. RBS China Holdings L.L.C. Delaware
5. RBS Global Inc. Delaware
6. RBS North America Inc. Delaware
7. Rexnord Germany-1 Inc. Delaware
8. Rexnord International Inc. Delaware
9. Rexnord Industries, Inc. Delaware
10. Winfred Berg Licensco Inc. Delaware
11. W.M. Berg Inc. Delaware
12. Prager Incorporated Louisiana
13. Addax Inc. Nebraska
14. Clarkson Industries Inc. New York
15. Rexnord Ltd. Nevada
16. Rexnord Puerto Rico Inc. Nevada
17. Betzdorf Chain Co. Inc. Wisconsin

</Table>

<Page>

EXHIBIT A

[Sher Garner letterhead]

May 15, 2003

Rexnord Corporation
4701 Greenfield Avenue
Milwaukee, WI 53214

Prager Incorporated
8550 United Plaza Boulevard
Baton Rouge, LA 70809

Latham & Watkins
555 Eleventh Street, N.W.
Suite 1000
Washington, D.C. 20004-1304

RE: Registration Statement on Form S-4 Relating to $225,000,000
Aggregate Principal Amount of 10-1/8% Senior Subordinated Notes
due 2012

Ladies and Gentlemen:

We have acted as special Louisiana counsel to Prager Incorporated, a
Louisiana corporation (the "LOUISIANA SUBSIDIARY"). In connection with the
registration of $225,000,000 aggregate principal amount of 10 1/8% Senior
Subordinated Notes due 2012 (the "SECURITIES") by Rexnord Corporation, a
Delaware corporation (the "COMPANY"), and each of the co-registrants thereto,
and the guaranty of the Securities (the "GUARANTY") by the Louisiana
Subsidiary and numerous other guarantors (the "ADDITIONAL GUARANTORS"), under
the Securities Act of 1933, as amended (the "ACT"), on Form S-4 filed with
the Securities and Exchange Commission (the "COMMISSION") on January 9, 2003,
and amended on March 19, 2003, April 17, 2003, May 14, 2003 and May 15, 2003
(File No. 333-102428) (the "REGISTRATION STATEMENT"), you have requested our
opinion with respect to the matters set forth below. The Securities and the
Guaranty will be issued pursuant to an Indenture dated as of November 25,
2002 (the "INDENTURE") by and among the Company, the Louisiana Subsidiary,
the Additional Guarantors and Wells Fargo Bank Minnesota, National
Association, as Trustee (the "TRUSTEE"). The Securities and the Guaranty will
be issued in exchange for the Company's outstanding 10 1/8% Senior
Subordinated Notes due 2012 on the terms set forth in the prospectus
contained in the Registration Statement and the Letter of Transmittal filed
as an exhibit thereto. Unless otherwise defined herein, terms defined in the
Indenture and used herein shall have the meanings given to them in the
Indenture.

We do not represent the Louisiana Subsidiary on a general or regular
basis and, accordingly, have no detailed information concerning its business or
operations. Therefore, nothing contained herein should be construed as an
opinion regarding the Louisiana Subsidiary or its operations satisfying or
otherwise complying with any local laws or ordinances or laws or

1
<Page>

ordinances of general application pertaining to the particular business and
operations of the Louisiana Subsidiary.

In arriving at the opinions expressed below, we have examined (a) an
executed copy of the Indenture, as well as (b) (i) a copy of the Articles of
Incorporation of the Louisiana Subsidiary, certified by the Secretary of the
Louisiana Subsidiary (the "ARTICLES OF INCORPORATION"); (ii) a copy of the
Bylaws of the Louisiana Subsidiary, certified by the Secretary of the Louisiana
Subsidiary (the "BYLAWS"); (iii) a Certificate of Good Standing for the
Louisiana Subsidiary from the Louisiana Secretary of State dated November 19,
2002; (iv) resolutions of the Board of Directors of the Louisiana Subsidiary,
certified by the Secretary of the Louisiana Subsidiary; and (v) a Certificate of
the Louisiana Subsidiary's Secretary with respect to the items set forth above
dated November 22, 2002 (the "SECRETARY'S CERTIFICATE"; collectively, items
(b)(i) through (b)(v) are the "CORPORATE DOCUMENTS").

In arriving at the opinions expressed below, we have made such
investigations of law, in each case as we have deemed appropriate as a basis for
such opinions.

In rendering the opinions expressed below, we have assumed, with your
permission and without independent investigation or inquiry, (a) the
authenticity of all documents submitted to us as originals, (b) the genuineness
of all signatures on all documents that we examined, (c) the conformity to
authentic originals of documents submitted to us as certified, conformed or
photostatic copies, (d) the accuracy of all statements of fact set forth in the
Indenture, and (e) the accuracy and completeness of the Corporate Documents. We
have made no investigation or inquiry to determine the accuracy of the foregoing
assumptions and are not responsible for the effect of the inaccuracy of any of
these assumptions on the opinions expressed herein.

Based upon the foregoing and subject to the foregoing exceptions, we
are of the opinion that:

1. The Guaranty by the Louisiana Subsidiary set forth in the Indenture
has been duly authorized by all necessary corporate action of the Louisiana
Subsidiary, and the Guaranty has been duly executed and delivered by the
Louisiana Subsidiary.

The opinions set forth above are subject to the following
qualifications and exceptions:

a. This Opinion is rendered solely as to matters of Louisiana law, and
we do not purport to express any opinion herein concerning any law other than
the laws of the State of Louisiana. We are not opining as to any securities
laws, blue-sky laws, or laws of the United States of America. To the extent, if
any, that the laws of any jurisdiction other than the State of Louisiana may be
applicable to any of the transactions or documents referred to herein, we
express no opinion with respect to any such laws or their effect on any of the
transactions or documents.

b. Our opinions are limited to the specific issues addressed and are
limited in all respects to laws and facts existing on the date of this opinion.
We undertake no responsibility to advise you of any changes in the law or the
facts after the date hereof that would alter the scope

2
<Page>

or substance of the opinions expressed herein. This Opinion expresses our legal
opinion as to the foregoing matters based on our professional judgment at this
time; it is not, however, to be construed as a guaranty that a court considering
such matters would not rule in a manner contrary to the opinions set forth
above.

c. We express no opinion with respect to the enforceability against the
Louisiana Subsidiary of the Indenture.

We consent to your filing this Opinion as an exhibit to the
Registration Statement and to the referenced to our firm contained in the
heading "Legal Matters" contained in the Prospectus contained therein.

Sincerely,

/s/ Sher Garner Cahill Richter Klein
McAlister & Hilbert, L.L.C.

Sher Garner Cahill Richter Klein McAlister
& Hilbert, L.L.C.

3
<Page>

EXHIBIT B

[Fitzgerald, Schorr, Barmettler & Brennan, P.C., L.L.O. Letterhead]

May 15, 2003

Rexnord Corporation
4701 Greenfield Avenue
Milwaukee, WI 53214

Addax, Inc.
2135 Cornhusker Hwy.
Lincoln, NE 68521

Latham & Watkins
555 Eleventh Street, N.W.
Suite 1000
Washington, D.C. 20004

Re: REGISTRATION STATEMENT ON FORM S-4 RELATING TO $225,000,000
AGGREGATE PRINCIPAL AMOUNT OF 10-1/8% SENIOR SUBORDINATED
NOTES DUE 2012

Ladies and Gentlemen:

In connection with the registration of $225,000,000 aggregate
principal amount of 10-1/8% Senior Subordinated Notes due 2012 (the
"Securities") by Rexnord Corporation, a Delaware corporation (the "Company")
and each of the co-registrants, the guarantees of the Securities (the
"Guarantees") by each of the entities listed on Schedule A hereto (the
"Guarantors"), and specifically that certain guaranty of the Securities (the
"Covered Guaranty") by Addax, Inc., a Nebraska corporation (the "Covered
Guarantor"), under the Securities Act of 1933, as amended (the "Act"), on
Form S-4 filed with the Securities and Exchange Commission (the "Commission")
on January 9, 2003, and amended on March 19, 2003, April 17, 2003, May 14,
2003 and May 15, 2003 (File No. 333-102428), (the "Registration Statement"),
you have requested our opinion with respect to the matters set forth below.
The Securities and the Guarantees will be issued pursuant to an indenture
dated as of November 25, 2002 (the "Indenture") by and among the Company,
each of the Guarantors and Wells Fargo Bank Minnesota, National Association,
as Trustee (the "Trustee"). The Securities and the Guarantees will be issued
in exchange for the Company's outstanding 10-1/8% Senior Subordinated Notes
due 2012 on the terms set forth in the prospectus contained in the
Registration Statement and the Letter of Transmittal filed as an exhibit
thereto. The Indenture, the Securities and the Guarantees are sometimes
referred to herein collectively as the "Operative Documents." Capitalized
terms used herein without definition have the meanings assigned to them in
the Indenture.

In our capacity as special counsel to the Covered Guarantor, in
connection with such registration, we are familiar with the proceedings taken by
the Covered Guarantor in connection with the authorization and issuance of the
Covered Guaranty, and have reviewed a signed copy of the Covered Guaranty
bearing the signature of Thomas J. Jansen.

1
<Page>

In addition, we have examined originals or copies certified or
otherwise identified to our satisfaction of the following documents:

(a) the Articles of Incorporation of Addax, Inc., as filed with
the Nebraska Secretary of State on November 13, 1985;

(b) the Bylaws of Addax, Inc.;

(c) the Certificate of Good Standing with respect to the Covered
Guarantor from the Nebraska Secretary of State dated March 11,
2003 (the "Certificate of Good Standing");

(d) the Written Consent in Lieu of a Special Meeting of the
Directors of Addax, Inc., dated November 25, 2002 (the
"Appointment Consent"); and

(e) the Written Consent in Lieu of a Special Meeting of the Board
of Directors of Addax, Inc., dated November 25, 2002 (the
"Directors' Consent").

The documents described in (a) through (e) above are collectively
referred to herein as the "Corporate Documents". With respect to all factual
matters, we have relied solely upon, and have assumed the accuracy, completeness
and genuineness of, the representations, warranties and certificates contained
in and made pursuant to, the Operative Documents and the Corporate Documents.

We have not served as general counsel for any of the parties to, nor
have we been involved in the transactions contemplated in, the Operative
Documents. We have represented the Covered Guarantor only with respect to the
rendering of this opinion.

In rendering the opinions set forth below, we have relied, with your
permission, upon the following specific assumptions, the accuracy of which we
have not independently verified:

(a) Except for the Operative Documents, there are no other
documents or agreements executed by or between any of the
parties that would expand or otherwise modify the obligations
of the Covered Guarantor under the Covered Guaranty or that
would have any effect on the opinion rendered herein;

(b) In our examination, we have assumed the genuineness of all
signatures, the authenticity of all documents submitted to us
as originals, and the conformity to authentic original
documents of all documents submitted to us as copies; and

(c) the Bylaws of the Covered Guarantor that have been provided to
us are the current Bylaws of the Covered Guarantor, and there
have been no Amendments to such Bylaws that would have any
effect on the opinion rendered herein;

We are opining herein as to the effect on the subject transaction only
of the laws of the State of Nebraska, and we express no opinion with respect to
the applicability thereto, or the

2
<Page>

effect thereon, of the laws of any other jurisdiction, including the federal
laws of the United States, or as to any matters of municipal law or the laws of
any local agencies within any state.

Subject to the foregoing and the other matters set forth herein, it is
our opinion that as of the date hereof:

(1) The Covered Guaranty to be executed and delivered by the
Covered Guarantor set forth in the Indenture has been duly
authorized by all necessary corporate action of the Covered
Guarantor, and the Covered Guaranty has been duly executed and
delivered by the Covered Guarantor.

To the extent that the obligations of the Company and each Guarantor
under the Operative Documents may be dependent upon such matters, we assume for
purposes of this opinion that each Guarantor other than the Covered Guarantor:
(a) is duly organized, validly existing and in good standing under the laws of
its jurisdiction of organization; (b) has the requisite organizational and legal
power and authority to perform its obligations under each of the Operative
Documents to which it is a party; (c) is duly qualified to engage in the
activities contemplated by each such Operative Document; and (d) has duly
authorized, executed and delivered each such Operative Document.

We consent to your filing this opinion as an exhibit to the
Registration Statement and to the reference to our firm contained under the
heading "Legal Matters: contained in the prospectus contained therein.

Very truly yours,

/s/ THOMAS R. OSTDIEK

THOMAS R. OSTDIEK
For the Firm

3
<Page>

SCHEDULE A

NAME JURISDICTION

PT Components Inc. Delaware
RAC-I Inc. Delaware
RBS Acquisition Corporation Delaware
RBS China Holdings L.L.C. Delaware
RBS Global Inc. Delaware
RBS North America Inc. Delaware
Rexnord Germany-1 Inc. Delaware
Rexnord International Inc. Delaware
Rexnord North America Holdings Inc. Delaware
Winfred Berg Licensco Inc. Delaware
W.M. Berg Inc. Delaware
Prager Incorporated Louisiana
Addax Inc. Nebraska
Clarkson Industries Inc. New York
Rexnord Ltd. Nevada
Rexnord Puerto Rico Inc. Nevada
Betzdorf Chain Co. Inc. Wisconsin

</Table>

4
<Page>

EXHIBIT C

[Hale Lane Letterhead]

Rexnord Corporation Rexnord, Ltd.
4701 Greenfield Avenue 4701 Greenfield Avenue
Milwaukee, WI 53214 Milwaukee, WI 53214

Latham & Watkins Rexnord Puerto Rico Inc.
53rd at Third 4701 Greenfield Avenue
885 Third Avenue Milwaukee, WI 53214
New York, NY 10022-4802

Re: REGISTRATION STATEMENT ON FORM S-4 RELATING TO $225,000,000 AGGREGATE
PRINCIPAL AMOUNT OF 10-1/8% SENIOR SUBORDINATED NOTES DUE 2012

Ladies and Gentlemen:

In connection with the registration of $225,000,000 aggregate
principal amount of 10-1/8% Senior Subordinated Notes due 2012 (the
"Securities") by Rexnord Corporation, a Delaware corporation (the "Company'),
and the guarantees of the Securities set forth in Section 11 of the Indenture
(the "Guarantees") by each of the entities listed on Schedule A hereto (the
"Guarantors"), under the Securities Act of 1933, as amended (the "Act"), on
Form S-4 filed with the Securities and Exchange Commission (the "Commission")
on January 9, 2003, and amended on March 19, 2003, April 17, 2003, May 14,
2003 and May 15, 2003 (File No. 333-102428), (the "Registration Statement"),
you have requested our opinion with respect to the matters set forth below.
The Securities and the Guarantees will be issued pursuant to an indenture
dated as of November 25, 2002 (the "Indenture") by and among the Company,
each of the Guarantors and Wells Fargo Bank Minnesota, National Association,
as Trustee (the "Trustee"). The Securities and the Guarantees will be issued
in exchange for the Company's outstanding 10-1/8% Senior Subordinated Notes
due 2012 on the terms set forth in the prospectus contained in the
Registration Statement and the Letter of Transmittal filed as an exhibit
thereto. The Indenture and the Securities are sometimes referred to herein
collectively as the "Operative Documents." Capitalized terms used herein
without definition have the meanings assigned to them in the Indenture.

In our capacity as your Nevada special counsel in connection with such
registration, we are familiar with the proceedings taken by Rexnord, Ltd., a
Nevada Corporation, and Rexnord Puerto Rico Inc., a Nevada corporation
(collectively, the "Covered Guarantors"), in connection with the authorization
and issuance of the Guarantees and, in rendering the opinions which follow, have
examined and relied upon the following documents:

(a) The Indenture;

1
<Page>

(b) A copy of the Articles of Incorporation of Rexnord, Ltd. filed
with the Secretary of State of Nevada on September 3, 1970,
and a Certificate of Amendment thereto filed with the
Secretary of State of Nevada on March 15, 1973;

(d) Written Consent of Directors of Rexnord, Ltd. dated
November 25, 2002;

(e) Certificate of Officer of Rexnord, Ltd. dated November 25,
2002;

(f) Certificate of Existence as to Rexnord, Ltd. issued by the
Nevada Secretary of State on November 19, 2002 ("Rexnord, Ltd.
Good Standing Certificate");

(g) A copy of the Articles of Incorporation of Rexnord Puerto Rico
filed with the Secretary of State of Nevada on June 14, 1978;

(h) A copy of the Bylaws of Rexnord Puerto Rico certified by an
officer of Rexnord Puerto Rico;

(i) Written Consent of Directors of Rexnord Puerto Rico dated
November 25, 2002;

(j) Certificate of Officer of Rexnord Puerto Rico dated
November 25, 2002; and

(k) Certificate of Existence as to Rexnord Puerto Rico issued by
the Nevada Secretary of State on November 21, 2002 ("Rexnord
Puerto Rico Good Standing Certificate").

In addition, we have made such legal and factual examinations and
inquiries, including an examination of originals or copies certified or
otherwise identified to our satisfaction of such documents, corporate records
and instruments, as we have deemed necessary or appropriate for purposes of this
opinion.

We are opining herein as to the effect on the subject transaction only
of the internal laws of the State of Nevada and we express no opinion with
respect to the applicability thereto, or the effect thereon, of the laws of any
other jurisdiction.

Subject to the foregoing and the other matters set forth herein, it is
our opinion that as of the date hereof the execution and delivery of the
Indenture in which the Guarantees are set forth have been duly authorized by all
necessary corporate action of the respective Covered Guarantor and the Indenture
has been duly executed and delivered by the Covered Guarantors.

2
<Page>

We have no responsibility or obligation to update this opinion, to
consider its applicability or correctness to any Person other than its
addressees, or to take into account changes in law, facts or any other
development of which we may later become aware.

Very truly yours,

/s/ Hale Lane Peek Dennison
Professional Corporation

3
<Page>

May 15, 2003
Page 1

EXHIBIT D

[Quarles & Brady Letterhead]

May 15, 2003

Rexnord Corporation
4701 Greenfield Avenue
Milwaukee, WI 53214

Betzdorf Chain Company Inc.
4701 Greenfield Avenue
Milwaukee, WI 53214

Latham & Watkins LLP
555 Eleventh Street, N.W., Suite 1000
Washington, District of Columbia 20004-1304

Re: REGISTRATION STATEMENT ON FORM S-4 RELATING TO $225,000,000
AGGREGATE PRINCIPAL AMOUNT OF 10-1/8% SENIOR SUBORDINATED
NOTES DUE 2012

Ladies and Gentlemen:

In connection with the registration of $225,000,000 aggregate
principal amount of 10-1/8% Senior Subordinated Notes due 2012 (the
"Securities") by Rexnord Corporation, a Delaware corporation (the "Company"),
and each of the other co-registrants thereto, and the guaranty of the
Securities (the "Guaranty") by Betzdorf Chain Company Inc. (the "Wisconsin
Guarantor"), under the Securities Act of 1933, as amended (the "Act"), on
Form S-4 filed with the Securities and Exchange Commission (the "Commission")
on January 9, 2003, and amended on March 19, 2003, April 17, 2003, May 14,
2003 and May 15, 2003 (File No. 333-102428), (the "Registration Statement"),
you have requested our opinion with respect to the matters set forth below.
The Securities and the Guaranty will be issued pursuant to an indenture dated
as of November 25, 2002 (the "Indenture") by and among the Company, the
parties listed on Schedule A hereto (collectively, the "Guarantors") and
Wells Fargo Bank Minnesota, National Association, as Trustee (the "Trustee").
The Securities and the Guaranty will be issued in exchange for the Company's
outstanding 10-1/8% Senior Subordinated Notes due 2012 on the terms set forth
in the prospectus contained in the Registration Statement and the Letter of
Transmittal filed as an exhibit thereto. The Indenture, the Securities and
the Guaranty are sometimes referred to herein collectively as the "Operative
Documents." Capitalized terms used herein without definition have the
meanings assigned to them in the Indenture.

In our capacity as your special counsel in connection with such
registration, we are familiar with the proceedings taken by the Wisconsin
Guarantor in connection with the

<Page>

May 15, 2003
Page 2

authorization and issuance of the Guaranty. In addition, we have made such legal
and factual examinations and inquiries, including an examination of originals or
copies certified or otherwise identified to our satisfaction of such documents,
corporate records and instruments, as we have deemed necessary or appropriate
for purposes of this opinion.

We are opining herein as to the effect on the subject transaction only
of the federal laws of the United States, the internal laws of the State of
Wisconsin, and we express no opinion with respect to the applicability thereto,
or the effect thereon, of the laws of any other jurisdiction, or as to any
matters of municipal law or the laws of any local agencies within any state.

Subject to the foregoing and the other matters set forth herein, it
is our opinion that, as of the date hereof, the Guaranty by the Wisconsin
Guarantor set forth in the Indenture has been duly authorized by all
necessary corporate action of the Wisconsin Guarantor and the Guaranty set
forth in the Indenture has been duly executed and delivered by the Wisconsin
Guarantor.

Very truly yours,

/s/ Quarles & Brady LLP

<Page>

May 15, 2003
Page 3

SCHEDULE A

NAME JURISDICTION

1. PT Components Inc. Delaware
2. RAC-I Inc. Delaware
3. RBS Acquisition Corporation Delaware
4. RBS China Holdings L.L.C. Delaware
5. RBS Global Inc. Delaware
6. RBS North America Inc. Delaware
7. Rexnord Germany-1 Inc. Delaware
8. Rexnord International Inc. Delaware
9. Rexnord North America Holdings Inc. Delaware
10. Winfred Berg Licensco Inc. Delaware
11. W.M. Berg Inc. Delaware
12. Prager Incorporated Louisiana
13. Addax Inc. Nebraska
14. Clarkson Industries Inc. New York
15. Rexnord Ltd. Nevada
16. Rexnord Puerto Rico Inc. Nevada
17. Betzdorf Chain Company Inc. Wisconsin

</Table>