Document:

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                                                                     Exhibit 4.2

                          FIRST SUPPLEMENTAL INDENTURE

                          Dated as of October 15, 1999

                                       TO
                                   INDENTURE,

                           Dated as of March 19, 1999

                                     among

                           PRECISION PARTNERS, INC.,

                                   as Company,

                          THE GUARANTORS named therein,

                                       and

                              THE BANK OF NEW YORK,
                                   as Trustee

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         FIRST SUPPLEMENTAL INDENTURE, dated as of October 15, 1999 (the "First
Supplemental Indenture"), by and among PRECISION PARTNERS, INC., a Delaware
corporation (the "Company"), the Guarantors under the Indenture referred to
below (the "Guarantors") and THE BANK OF NEW YORK, as Trustee (the "Trustee").

                              W I T N E S S E T H :

          WHEREAS the Company and the Guarantors have heretofore executed
and delivered to the Trustee an Indenture (the "Indenture"), dated as of
March 19, 1999, providing for the issuance of an aggregate principal amount
of $150,000,000 of 12% Senior Subordinated Notes due 2009 (the "Securities");

          WHEREAS the Company has issued and outstanding $100 million of
     Securities;

          WHEREAS the Company desires and has requested the Trustee to join
with the Company in the execution and delivery of this First Supplemental
Indenture for the purpose of amending the Indenture in order to cure an
ambiguity, omission, defect and inconsistency requiring the execution and
delivery of a supplemental indenture by the Company or a Guarantor that is
already a party to, and bound by, the Indenture in the event a Guarantor is
merged with or into it in order to become a party to, and bound by, the
Indenture;

          WHEREAS Section 9.1 of the Indenture provides that a supplemental
indenture may be entered into by the Company, the Guarantors and the
Trustee to change certain provisions of the Indenture or modify certain
rights of the Holders of Securities without notice to or the consent of any
Holder so long as such change does not, in the opinion of the Trustee,
adversely affect the rights of any of the Holders in any material respect,
including to cure any ambiguity, omission, defect or inconsistency;

          WHEREAS, an Opinion of Counsel stating that the modification of the
terms of the Indenture pursuant to this First Supplemental Indenture do not
adversely affect the rights of any of the Holders in any material respect
has been delivered to the Trustee; and

          WHEREAS pursuant to Section 9.1 of the Indenture, the Trustee, the
Company and the Guarantors are authorized to execute and deliver this
Supplemental Indenture;

          NOW THEREFORE, in consideration of the foregoing and for other good
and valuable consideration, the receipt of which is hereby acknowledged,
the Company, the Guarantors and the Trustee mutually covenant and agree for
the equal and ratable benefit of the Holders of the Securities as follows:

     1. DEFINITIONS.  (a) Capitalized terms used herein without definition shall
have the meanings assigned to them in the Indenture.

        (b) For all purposes of this First Supplemental Indenture, except as
otherwise herein expressly provided or unless the context otherwise
requires: (i) the terms and expressions

                                     1

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used herein shall have the same meanings as corresponding terms and expressions
used in the Indenture; and (ii) the words "herein," "hereof" and "hereby" and
other words of similar import used in this First Supplemental Indenture refer to
this First Supplemental Indenture as a whole and not to any particular section
hereof.

     2. AMENDMENT.  Clause (i) of Section 5.1 of the Indenture is amended to
insert, at the end thereof, the following:

     "; PROVIDED that a Guarantor may merge with or into the Company or another
Guarantor without complying with this clause (i)."

     3. EFFECTIVENESS.  This First Supplemental Indenture shall be effective on
the date hereof and upon such effectiveness the Indenture shall be deemed to be
modified and amended in accordance herewith and the respective rights,
limitations of rights, obligations, duties and immunities under the Indenture of
the Trustee, the Company, the Guarantors and the Holders of the Securities shall
thereafter be determined, exercised and enforced under the Indenture subject in
all respects to such modifications and amendments, and all the terms and
conditions of this First Supplemental Indenture shall be deemed to be part of
the terms and conditions of the Indenture for any and all purposes.

     4. MISCELLANEOUS.

        4.1. This First Supplemental Indenture is an indenture supplemental to
and in implementation of the Indenture, and the Indenture and this First
Supplemental Indenture shall henceforth be read and construed together.

        4.2. The Indenture as supplemented by this First Supplemental
Indenture is in all respects confirmed and preserved.

        4.3. If any provision of this First Supplemental Indenture limits,
qualifies or conflicts with any provision of the TIA, that is required
under the TIA to be part of and govern any provision of this First
Supplemental Indenture, the provision of the TIA shall control. If any
provision of this First Supplemental Indenture modifies or excludes any
provision of the TIA that may be so modified or excluded, the provisions of
the TIA shall be deemed to apply to the Indenture as so modified or to be
excluded by this First Supplemental Indenture, as the case may be.

        4.4. In case any provision of this First Supplemental Indenture shall
be invalid, illegal or unenforceable, the validity, legality and
enforceability of the remaining provisions shall not in any way be affected
or impaired thereby.

        4.5. The Section headings herein are for convenience only and shall
not affect the construction hereof.

        4.6. Nothing in this First Supplemental Indenture, the Indenture, or
the Securities, express or implied, shall give to any Person, other than
the parties hereto and thereto and their successors hereunder and
thereunder, and the Holders of the Securities, any benefit of

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any legal or equitable right, remedy or claim under the Indenture, this First
Supplemental Indenture or the Securities.

        4.7. All covenants and agreements in this First Supplemental Indenture
by the Company shall bind its successors and assigns, whether so expressed
or not.

        4.8. THIS FIRST SUPPLEMENTAL INDENTURE SHALL BE GOVERNED BY AND
CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK, AS APPLIED
TO CONTRACTS MADE OR ENTERED INTO AND PERFORMED WITHIN THE STATE OF NEW
YORK, WITHOUT REGARD TO PRINCIPLES OF CONFLICT OF LAWS.

        4.9. This First Supplemental Indenture may be executed in
counterparts, each of which shall be an original, and all of which taken
together shall constitute one and the same instrument.

        4.10 The Trustee makes no representation as to the validity or
sufficiency of this First Supplemental Indenture.

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         IN WITNESS WHEREOF, the parties hereto have caused this First
Supplemental Indenture to be duly executed as of the day and year first above
written.

                                  THE COMPANY:
                                  PRECISION PARTNERS, INC.

                                  By:   /s/ Ronald M. Miller
                                       ---------------------------------
                                       Name: Ronald M. Miller
                                       Title:   Chief Financial Officer

                                  GUARANTORS:
                                  CERTIFIED FABRICATORS, INC.

                                  By:   /s/ Ronald M. Miller
                                       ---------------------------------
                                       Name: Ronald M. Miller
                                       Title:   Vice President

                                  GENERAL AUTOMATION, INC.

                                  By:   /s/ Ronald M. Miller
                                       ---------------------------------
                                       Name: Ronald M. Miller
                                       Title:   Vice President

                                   NATIONWIDE PRECISION PRODUCTS CORP.

                                   By:   /s/ Ronald M. Miller
                                        ---------------------------------
                                        Name: Ronald M. Miller
                                        Title:   Vice President

                                   MID STATE MACHINE PRODUCTS

                                   By:   /s/ Ronald M. Miller
                                         --------------------------------
                                         Name: Ronald M. Miller
                                         Title:   Vice President

                                     4

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                                   GALAXY INDUSTRIES CORPORATION

                                   By:    /s/ Ronald M. Miller
                                         ---------------------------------
                                         Name: Ronald M. Miller
                                         Title:   Vice President

                                   CALBRIT DESIGN, INC.

                                   By:    /s/ Ronald M. Miller
                                         --------------------------------
                                          Name: Ronald M. Miller
                                          Title:   Vice President

                                   TRUSTEE:
                                   THE BANK OF NEW YORK

                                   By:    /s/ Remo J. Reale
                                         ---------------------------------
                                          Name: Remo J. Reale
                                          Title: Assistant Vice President

                                     5<PAGE>

                                                                   Exhibit 4.3

                          SECOND SUPPLEMENTAL INDENTURE

                          dated as of October 29, 1999

                                       TO

                                    INDENTURE

                           dated as of March 19, 1999

                                      among

                            PRECISION PARTNERS, INC.,

                                   as Company,

                        THE GUARANTORS named therein, and

                              THE BANK OF NEW YORK,

                                   as Trustee,

                                   as amended

                                       -1-

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          SECOND SUPPLEMENTAL INDENTURE (this "Second Supplemental Indenture"),
dated as of October 29, 1999, among GILLETTE MACHINE & TOOL CO., INC., a
New York corporation (the "New Guarantor") and a newly acquired subsidiary
of PRECISION PARTNERS, INC. (the "Company"), the Company, the existing
guarantors (the "Existing Guarantors") under the Indenture referred to
below, and THE BANK OF NEW YORK, a national banking corporation, as trustee
under the Indenture referred to below (the "Trustee").

                             W I T N E S S E T H :

          WHEREAS the Company has heretofore executed and delivered to the
Trustee an Indenture, dated as of March 19, 1999 (as amended by the First
Supplemental Indenture dated as of October 15, 1999, the "Indenture"),
providing for the issuance of an aggregate principal amount of $150,000,000
of 12% Senior Subordinated Notes due 2009 (the "Securities");

          WHEREAS the Company has issued and outstanding $100 million of
Securities under the Indenture;

          WHEREAS Section 4.14 of the Indenture provides that under certain
circumstances the Company is required to cause the New Guarantor to execute
and deliver to the Trustee a supplemental indenture pursuant to which the
New Guarantor shall unconditionally guarantee all of the Company's
obligations under the Securities pursuant to a Guarantee on the terms and
conditions set forth herein and in Article 11 of the Indenture;

          WHEREAS Section 9.1 of the Indenture provides that a supplemental
indenture may be entered into by the Company, the Existing Guarantors and
the Trustee to change certain provisions of the Indenture or modify certain
rights of the Holders of Securities without notice to or the consent of any
Holder so long as such change does not, in the opinion of the Trustee,
adversely affect the rights of any of the Holders in any material respect,
including to add Guarantees with respect to the Securities; and

          WHEREAS pursuant to Section 9.1 of the Indenture, the Trustee, the
Company, the Existing Guarantors and the New Guarantor are authorized to
execute and deliver this Supplemental Indenture;

          NOW THEREFORE, in consideration of the foregoing and for other good
and valuable consideration, the receipt of which is hereby acknowledged,
the New Guarantor, the Company, the Existing Guarantors and the Trustee
mutually covenant and agree for the equal and ratable benefit of the
holders of the Securities as follows:

          1. DEFINITIONS. (a) Capitalized terms used herein without definition
shall have the meanings assigned to them in the Indenture.

          (b) For all purposes of this Second Supplemental Indenture, except as
otherwise herein expressly provided or unless the context otherwise
requires: (i) the terms and expressions used herein shall have the same
meanings as corresponding terms and expressions used in the Indenture; and
(ii) the words "herein," "hereof" and "hereby" and other words of

                                       -2-

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similar import used in this Second Supplemental Indenture refer to this Second
Supplemental Indenture as a whole and not to any particular section hereof.

          2. AGREEMENT TO GUARANTEE. The New Guarantor hereby agrees, jointly
and severally with all other Guarantors, to guarantee the Company's
obligations under the Securities on the terms and subject to the conditions
set forth in Article 11 of the Indenture and to be bound by all other
applicable provisions of the Indenture. From and after the date hereof, the
New Guarantor shall be a Guarantor for all purposes under the Indenture and
the Securities.

          3. RATIFICATION OF INDENTURE; SECOND SUPPLEMENTAL INDENTURE PART OF
INDENTURE. Except as expressly amended hereby, the Indenture is in all
respects ratified and confirmed and all the terms, conditions and
provisions thereof shall remain in full force and effect. This Second
Supplemental Indenture shall form a part of the Indenture for all purposes,
and every holder of Securities heretofore or hereafter authenticated and
delivered shall be bound hereby.

          4. MISCELLANEOUS.

          4.1 GOVERNING LAW. THIS SECOND SUPPLEMENTAL INDENTURE SHALL BE
GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW
YORK BUT WITHOUT GIVING EFFECT TO APPLICABLE PRINCIPLES OF CONFLICTS OF LAW
TO THE EXTENT THAT THE APPLICATION OF THE LAWS OF ANOTHER JURISDICTION
WOULD BE REQUIRED THEREBY.

          4.2 TRUSTEE MAKES NO REPRESENTATION. The Trustee makes no
representation as to the validity or sufficiency of this Second
Supplemental Indenture.

          4.3 COUNTERPARTS. The parties may sign any number of copies of this
Second Supplemental Indenture. Each signed copy shall be an original, but
all of them together represent the same agreement.

          4.4 EFFECT OF HEADINGS. The Section headings herein are for
convenience only and shall not affect the construction thereof.

          4.5 CONFLICT WITH TIA. If any provision of this First Supplemental
Indenture limits, qualifies or conflicts with any provision of the TIA,
that is required under the TIA to be part of and govern any provision of
this First Supplemental Indenture, the provision of the TIA shall control.
If any provision of this First Supplemental Indenture modifies or excludes
any provision of the TIA that may be so modified or excluded, the
provisions of the TIA shall be deemed to apply to the Indenture as so
modified or to be excluded by this First Supplemental Indenture, as the
case may be.

          4.6. SEVERABILITY. In case any provision of this First Supplemental
Indenture shall be invalid, illegal or unenforceable, the validity,
legality and enforceability of the remaining provisions shall not in any
way be affected or impaired thereby.

          4.7. NO THIRD PARTY BENEFICIARIES. Nothing in this Second Supplemental
Indenture, the Indenture, or the Securities, express or implied, shall give
to any Person, other

                                       -3-

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than the parties hereto and thereto and their successors hereunder and
thereunder, and the Holders of the Securities, any benefit of any legal or
equitable right, remedy or claim under the Indenture, this Second Supplemental
Indenture or the Securities.

          IN WITNESS WHEREOF, the parties hereto have caused this Second
Supplemental Indenture to be duly executed as of the date first above
written.

                                  New Guarantor:

                                  GILLETTE MACHINE & TOOL CO., INC.

                                  By:  /s/ Ronald M. Miller
                                     --------------------------------
                                     Name: Ronald M. Miller
                                     Title:  Vice President

                                  Company:

                                  PRECISION PARTNERS, INC.

                                  By:  /s/ Ronald M. Miller
                                     -------------------------------
                                     Name: Ronald M. Miller
                                     Title:  Chief Financial Officer

                                  Existing Guarantors:

                                  CERTIFIED FABRICATORS, INC.

                                  By:  /s/ Ronald M. Miller
                                     --------------------------------
                                     Name: Ronald M. Miller
                                     Title:   Vice President

                                  GENERAL AUTOMATION, INC.

                                  By:  /s/ Ronald M. Miller
                                     ---------------------------------
                                     Name: Ronald M. Miller
                                     Title:   Vice President

                                  NATIONWIDE PRECISION PRODUCTS CORP.

                                       -4-

<PAGE>

                                  By:  /s/ Ronald M. Miller
                                     ----------------------------------
                                     Name: Ronald M. Miller
                                     Title:   Vice President

                                  MID STATE MACHINE PRODUCTS

                                  By:  /s/ Ronald M. Miller
                                     -----------------------------------
                                     Name: Ronald M. Miller
                                     Title:   Vice President

                                  GALAXY INDUSTRIES CORPORATION

                                  By:  /s/ Ronald M. Miller
                                     ------------------------------------
                                     Name: Ronald M. Miller
                                     Title:   Vice President

                                  Trustee:

                                  THE BANK OF NEW YORK

                                  By:  /s/ Remo J. Reale
                                     -------------------------------------
                                     Name: Remo J. Reale
                                     Title: Assistant Vice President

                                       -5-

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