Exhibit 10.11

GUARANTY AGREEMENT

THIS GUARANTY AGREEMENT(this "Guaranty Agreement"), dated as of December 9,
2003, is made byEACH OF THE UNDERSIGNED AND EACH OTHER PERSON WHO SHALL BECOME A PARTY HERETO BY EXECUTION OF A GUARANTY JOINDER AGREEMENT(each a
"Guarantor" and collectively the "Guarantors") toBANK OF AMERICA, N.A., a national banking
association organized and existing under the laws of the United States, as administrative agent (in such capacity, the "Administrative Agent") for each of the lenders (the
"Lenders") now or hereafter party to the Credit Agreement defined below (collectively with the Administrative Agent, and certain other Persons parties to Related Swap
Contracts as more particularly described in Section 19 hereof, the "Secured Parties"). All capitalized terms used but not otherwise
defined herein shall have the meanings ascribed to such terms in the Credit Agreement.

W I T N E S S E T H:

WHEREAS, the Secured Parties have agreed to provide to Precision Castparts Corp., an Oregon corporation (the
"Borrower"), certain credit facilities, including a term loan facility and revolving credit facility with a letter of credit sublimit pursuant to the terms of that certain
Credit Agreement dated as of December 9, 2003, among the Borrower, the Administrative Agent and the Lenders (as from time to time amended, modified, supplemented or restated, the
"Credit Agreement"); and

WHEREAS, each Guarantor is, directly or indirectly, a Subsidiary of the Borrower and will materially benefit from the Loans made and to be
made, and the Letters of Credit issued and to be issued, under the Credit Agreement; and

WHEREAS, each Guarantor is required to enter into this Guaranty Agreement pursuant to the terms of the Credit Agreement; and

WHEREAS, a material part of the consideration given in connection with and as an inducement to the execution and delivery of the Credit
Agreement by the Secured Parties was the obligation of the Borrower to cause each Guarantor to enter into this Guaranty Agreement, and the Secured Parties are unwilling to extend and maintain the
credit facilities provided under the Loan Documents unless the Guarantors enter into this Guaranty Agreement;

NOW, THEREFORE, in consideration of the premises and mutual covenants contained herein, the parties hereto agree as follows:

1.Guaranty.Each Guarantor hereby jointly and severally,
unconditionally, absolutely, continually and irrevocably guarantees to the Administrative Agent for the benefit of the Secured Parties the payment and performance in full of the Borrower's Liabilities
(as defined below). For all purposes of this Guaranty Agreement, "Borrower's Liabilities" means: (a) the Borrower's prompt payment in full, when due or declared due
and at all such times, of all Obligations and all other amounts pursuant to the terms of the Credit Agreement, the Notes, and all other Loan Documents heretofore, now or at any time or times hereafter
owing, arising, due or payable from the Borrower to any one or more of the Secured Parties, including principal, interest, premiums and fees (including, but not limited to, loan fees and Attorney
Costs); (b) the Borrower's prompt, full and faithful performance, observance and discharge of each and every agreement, undertaking, covenant and provision to be performed, observed or
discharged by the Borrower under the Credit Agreement and all other Loan Documents; and (c) the Borrower's prompt payment in full, when due or declared due and at all such times, of obligations
and liabilities now or hereafter arising under Related Swap Contracts. The Guarantors' obligations to the Secured Parties under this Guaranty Agreement are hereinafter collectively referred to as the
"Guarantors' Obligations" and, with respect to each Guarantor individually, the "Guarantor's Obligations". Notwithstanding the foregoing, the
liability of each Guarantor individually with respect to its Guarantor's Obligations shall be limited to an aggregate amount equal to the largest amount that would not render its obligations hereunder
subject to

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avoidance
under Section 548 of the United States Bankruptcy Code or any comparable provisions of any applicable state law.

Each
Guarantor agrees that it is jointly and severally, directly and primarily liable (subject to the limitation in the immediately preceding sentence) for the Borrower's Liabilities.

2.Payment.If the Borrower shall default in payment or
performance of any of the Borrower's Liabilities, whether principal, interest, premium, fee (including, but not limited to, loan fees and Attorney Costs), or otherwise, when and as the same shall
become due, and after expiration of any applicable grace
period, whether according to the terms of the Credit Agreement, by acceleration, or otherwise, or upon the occurrence and during the continuance of any Event of Default under the Credit Agreement,
then any or all of the Guarantors will, upon demand thereof by the Administrative Agent, fully pay to the Administrative Agent, for the benefit of the Secured Parties, subject to any restriction on
each Guarantor's Obligations set forth in Section 1 hereof, an amount equal to all the Borrower's Liabilities then due and owing.

3.Absolute Rights and Obligations.This is a guaranty of
payment and not of collection. The Guarantors' Obligations under this Guaranty Agreement shall be joint and several, absolute and unconditional irrespective of, and each Guarantor hereby expressly
waives, to the extent permitted by law, any defense to its obligations under this Guaranty Agreement and all to which it is a party by reason of:



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It
is the express purpose and intent of the parties hereto that this Guaranty Agreement and the Guarantors' Obligations hereunder and under each Guaranty Joinder Agreement shall be absolute and
unconditional under any and all circumstances and shall not be discharged except by payment as herein provided.

4.Currency and Funds of Payment.All Guarantors'
Obligations will be paid in lawful currency of the United States of America and in immediately available funds, regardless of any law, regulation or decree now or hereafter in effect that might in any
manner affect the Borrower's Liabilities, or the rights of any Secured Party with respect thereto as against the Borrower, or cause or permit to be invoked any alteration in the time, amount or manner
of payment by the Borrower of any or all of the Borrower's Liabilities.

5.Events of Default.Without limiting the provisions of Section 2hereof, in the
event that there shall occur and be continuing an Event of Default, then notwithstanding any collateral or other
security or credit support for the Borrower's Liabilities, at the Administrative Agent's election and without notice thereof or demand therefor, the Guarantors' Obligations shall immediately be and
become due and payable.

6.Subordination.Until this Guaranty Agreement is
terminated in accordance withSection 22hereof, each Guarantor hereby unconditionally subordinates all present and future debts, liabilities or
obligations now or hereafter owing to such Guarantor (a) of the Borrower, to the payment in full of the Borrower's Liabilities, (b) of every other Guarantor (an "obligated guarantor"),
to the payment in full of the Guarantors' Obligations of such obligated guarantor, and (c) of each other Person now or hereafter constituting a Loan Party, to the payment in full of the
obligations of such Loan Party owing to any Secured Party and arising under the Loan Documents. All amounts due under such subordinated debts, liabilities, or obligations shall, upon the occurrence
and during the continuance of an Event of Default, be collected and, upon request by the Administrative Agent, paid over forthwith to the Administrative Agent for the benefit of the Secured Parties on
account of the Borrower's Liabilities, the Guarantors' Obligations, or such other obligations, as applicable, and, after such request and pending such payment, shall be held by such Guarantor as agent
and bailee of the Secured Parties separate and apart from all other funds, property and accounts of such Guarantor.

7.Suits.Each Guarantor from time to time shall pay to the
Administrative Agent for the benefit of the Secured Parties, on demand, at the Administrative Agent's place of business set forth in the Credit Agreement or such other address as the Administrative
Agent shall give notice of to such Guarantor, the Guarantors' Obligations as they become or are declared due, and in the event such

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payment
is not made forthwith, the Administrative Agent may proceed to suit against any one or more or all of the Guarantors. At the Administrative Agent's election, one or more and successive or
concurrent suits may be brought hereon by the Administrative Agent against any one or more or all of the Guarantors, whether or not suit has been commenced against the Borrower, any other Guarantor,
or any other Person and whether or not the Secured Parties have taken or failed to take any other action to collect all or any portion of the Borrower's Liabilities or have taken or failed to take any
actions against any collateral securing payment or performance of all or any portion of the Borrower's Liabilities, and irrespective of any event, occurrence, or condition described in
Section 3 hereof.

8.Set-Off and Waiver.Each Guarantor waives
any right to assert against any Secured Party as a defense, counterclaim, set-off, recoupment or cross claim in respect of its Guarantor's Obligations, any defense (legal or equitable) or
other claim which such Guarantor may now or at any time hereafter have against the Borrower or any or all of the Secured Parties without waiving any additional defenses, set-offs,
counterclaims or other claims otherwise available to such Guarantor. Each Guarantor agrees that each Secured Party shall have a lien for all the Guarantor's Obligations upon all deposits or deposit
accounts, of any kind, or any interest in any deposits or deposit accounts, now or hereafter pledged, mortgaged, transferred or assigned to such Secured Party or otherwise in the possession or control
of such Secured Party for any purpose (other than solely for safekeeping) for the account or benefit of such Guarantor, including any balance of any deposit account or of any credit of such Guarantor
with the Secured Party, whether now existing or hereafter established, and hereby authorizes each Secured Party from and after the occurrence of an Event of Default at any time or times with or
without prior notice to apply such balances or any part thereof to such of the Guarantor's Obligations to the Secured Parties then due and in such amounts as provided for in the Credit Agreement or
otherwise as they may elect. Each Secured Party agrees promptly to notify the Borrower and the applicable Guarantor after any such set-off and application made by such Secured Party;
provided, however, that the failure to give such notice shall
not affect the validity of such set-off or application. For the purposes of this Section 8, all remittances and property shall be deemed to be in the
possession of a Secured Party as soon as the same may be put in transit to it by mail or carrier or by other bailee.

9.Waiver of Notice; Subrogation.



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10.Effectiveness; Enforceability.This Guaranty Agreement
shall be effective as of the date first above written and shall continue in full force and effect until termination in accordance with Section 22 hereof. Any claim
or claims that the Secured Parties may at any time hereafter have against a

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Guarantor
under this Guaranty Agreement may be asserted by the Administrative Agent on behalf of the Secured Parties by written notice directed to such Guarantor in accordance with
Section 24 hereof.

11.Representations and Warranties.Each Guarantor warrants
and represents to the Administrative Agent, for the benefit of the Secured Parties, that it is duly authorized to execute and deliver this Guaranty Agreement (or the Guaranty Joinder Agreement to
which it is a party, as applicable), and to perform its obligations under this Guaranty Agreement, that this Guaranty Agreement (or the Guaranty Joinder Agreement to which it is a party, as
applicable) has been duly executed and delivered on behalf of such Guarantor by its duly authorized representatives; that this Guaranty Agreement (and
any Guaranty Joinder Agreement to which such Guarantor is a party) is legal, valid, binding and enforceable against such Guarantor in accordance with its terms except as enforceability may be limited
by bankruptcy, insolvency, reorganization, moratorium or similar laws affecting the enforcement of creditors' rights generally and by general equitable principles; and that such Guarantor's execution,
delivery and performance of this Guaranty Agreement (and any Guaranty Joinder Agreement to which such Guarantor is a party) do not violate or constitute a breach of any of its Organizational
Documents, any agreement or instrument to which such Guarantor is a party, or any law, order, regulation, decree or award of any governmental authority or arbitral body to which it or its properties
or operations is subject.

12.Expenses.Each Guarantor agrees to be jointly and
severally liable for the payment of all reasonable fees and expenses, including Attorney Costs, incurred by any Secured Party in connection with the enforcement of this Guaranty Agreement, whether or
not suit be brought.

13.Reinstatement.Each Guarantor agrees that this Guaranty
Agreement shall continue to be effective or be reinstated, as the case may be, at any time payment received by any Secured Party in respect of any Borrower's Liabilities is rescinded or must be
restored for any reason, or is repaid by any Secured Party in whole or in part in good faith settlement of any pending or threatened avoidance claim.

14.Attorney-in-Fact.To the extent
permitted by law, each Guarantor hereby appoints the Administrative Agent, for the benefit of the Secured Parties, as such Guarantor's attorney-in-fact for the purposes of
carrying out the provisions of this Guaranty Agreement and taking any action and executing any instrument which the Administrative Agent may deem necessary or advisable to accomplish the purposes
hereof, which appointment is coupled with an interest and is irrevocable; provided, that the Administrative Agent shall have and may exercise rights under this power of
attorney only upon the occurrence and during the continuance of an Event of Default.

15.Reliance.Each Guarantor represents and warrants to the
Administrative Agent, for the benefit of the Secured Parties, that: (a) such Guarantor has adequate means to obtain on a continuing basis (i) from the Borrower, information concerning
the Borrower and the Borrower's financial condition and affairs and (ii) from other reliable sources such other information as it deems material in deciding to provide this Guaranty Agreement
and any Guaranty Joinder Agreement ("Other Information"), and has full and complete access to the Borrower's books and records and to such Other Information;
(b) such Guarantor is not relying on any Secured Party or its or their employees, directors, agents or other representatives or Affiliates, to provide any such information, now or in the
future; (c) such Guarantor has been furnished with and reviewed the terms of the Credit Agreement and such other Loan Documents as it has requested, is executing this Guaranty Agreement (or the
Guaranty Joinder Agreement to which it is a party, as applicable) freely and deliberately, and understands the obligations and financial risk undertaken by providing this Guaranty Agreement (and any
Guaranty Joinder Agreement); (d) such Guarantor has relied solely on the Guarantor's own independent investigation, appraisal and analysis of the Borrower, the Borrower's financial condition
and affairs, the "Other Information", and such other matters as it deems material in deciding to provide this Guaranty Agreement (and any Guaranty Joinder Agreement) and is fully aware of the

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same;
and (e) such Guarantor has not depended or relied on any Secured Party or its or their employees, directors, agents or other representatives or Affiliates, for any information whatsoever
concerning the Borrower or the Borrower's financial condition and affairs or any other matters material to such Guarantor's decision to provide this Guaranty Agreement (and any Guaranty Joinder
Agreement), or for any counseling, guidance, or special consideration or any promise therefor with respect to such decision. Each Guarantor agrees that no Secured Party has any duty or responsibility
whatsoever, now or in the future, to provide to such Guarantor any information concerning the Borrower or the Borrower's financial condition and affairs, or any Other Information, other than as
expressly provided herein, and that, if such Guarantor receives any such information from any Secured Party or its or their employees, directors, agents or other representatives or Affiliates, such
Guarantor will independently verify the information and will not rely on any Secured Party or its or their employees, directors, agents or other representatives or Affiliates, with respect to such
information.

16.Rules of Interpretation.The rules of interpretation
contained in Sections 1.02 and 1.05 of the Credit Agreement shall be applicable to this Guaranty Agreement and each Guaranty Joinder Agreement
and are hereby incorporated by reference. All representations and warranties contained herein shall survive the delivery of documents and any extension of credit referred to herein or guaranteed
hereby.

17.Entire Agreement.This Guaranty Agreement and each
Guaranty Joinder Agreement, together with the Credit Agreement and other Loan Documents, constitute and express the entire understanding between the parties hereto with respect to the subject matter
hereof, and supersede all prior negotiations, agreements, understandings, inducements, commitments or conditions, express or implied, oral or written, except as herein contained. The express terms
hereof control and supersede any course of performance or usage of the trade inconsistent with any of the terms hereof. Except as provided in Section 22, neither
this Guaranty Agreement nor any Guaranty Joinder Agreement nor any portion or provision hereof or thereof may be changed, altered, modified, supplemented, discharged, canceled, terminated, or amended
orally or in any manner other than as provided in the Credit Agreement.

18.Binding Agreement; Assignment.This Guaranty Agreement,
each Guaranty Joinder Agreement and the terms, covenants and conditions hereof and thereof shall be binding upon and inure to the benefit of the parties hereto and thereto, and to their respective
heirs, legal representatives, successors and assigns; provided, however, that no Guarantor shall be permitted to assign any of its rights,
powers, duties or obligations under this Guaranty Agreement, any Guaranty Joinder Agreement or any other interest herein or therein without the prior written consent of the Administrative Agent.
Without limiting the generality of the foregoing sentence of this Section 18, any Lender may assign to one or more Persons, or grant to one or more Persons
participations in or to, all or any part of its rights and obligations under the Credit Agreement (to the extent permitted by the Credit Agreement); and to the extent of any such assignment or
participation such other Person shall, to the fullest extent permitted by law, thereupon become vested with all the benefits in respect thereof granted to such Lender herein or otherwise, subject,
however, to the provisions of the Credit Agreement, including Article IX thereof (concerning the Administrative Agent) and
Section 10.07 thereof (concerning assignments and participations). All references herein to the Administrative Agent shall include any successor thereof.

19.Related Swap Contracts.All obligations of the Borrower
under Related Swap Contracts to which any Lender or its Affiliates are a party shall be deemed to be Borrower's Liabilities, and each Lender or Affiliate of a Lender party to any such Related Swap
Contract shall be deemed to be a Secured Party hereunder with respect to such Borrower's Liabilities; provided, however, that such obligations
shall cease to be Borrower's Liabilities at such time, prior to the Facility Termination Date, as such Person (or Affiliate of such Person) shall cease to be a "Lender" under the Credit Agreement.

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No
Person who obtains the benefit of this Guaranty Agreement by virtue of the provisions of this Section shall have, prior to the Facility Termination Date, any right to notice of any
action or to consent to, direct or object to any action hereunder or under any other Loan Document or otherwise in respect of the Guarantors' Obligations (including the release or modification of any
Guarantors' Obligations or security therefor) other than in its capacity as a Lender and only to the extent expressly provided in the Loan Documents. Each Secured Party not a party to the Credit
Agreement who obtains the benefit of this Guaranty Agreement by virtue of the provisions of this Section shall be deemed to have acknowledged and accepted the appointment of the Administrative Agent
pursuant to the terms of the Credit Agreement, and that with respect to the actions and omissions of the Administrative Agent hereunder or otherwise relating hereto that do or may affect such Secured
Party, the Administrative Agent and each Agent-Related Person shall be entitled to all the rights, benefits and immunities conferred under Article IX of the Credit
Agreement.

20.Severability.The provisions of this Guaranty Agreement
are independent of and separable from each other. If any provision hereof shall for any reason be held invalid or unenforceable, such invalidity or unenforceability shall not affect the validity or
enforceability of any other provision hereof, but this Guaranty Agreement shall be construed as if such invalid or unenforceable provision had never been contained herein.

21.Counterparts.This Guaranty Agreement may be executed
in any number of counterparts each of which when so executed and delivered shall be deemed an original, and it shall not be necessary in making proof of this Guaranty Agreement to produce or account
for more than one such counterpart executed by the Guarantor against whom enforcement is sought. Without limiting the foregoing provisions of this Section 21, the
provisions of Section 10.02(b) of the Credit Agreement shall be applicable to this Guaranty Agreement.

22.Termination.

(a)   Subject
to reinstatement pursuant to Section 13 hereof, this Guaranty Agreement and each Guaranty Joinder Agreement, and all of the
Guarantors' Obligations hereunder (excluding those Guarantors' Obligations relating to Borrower's Liabilities that expressly survive such termination) shall terminate without delivery of any
instrument or performance of any act by any party on the Facility Termination Date.

(b)   With
respect to the Guarantor's Obligations of any Guarantor Disposed of in accordance with the Credit Agreement, the Guarantor's Obligations of such Guarantor shall
terminate upon the consummation of the Disposition of such Guarantor in accordance with the terms of the Credit Agreement.

23.Remedies Cumulative; Late Payments.All remedies
hereunder are cumulative and are not exclusive of any other rights and remedies of the Administrative Agent or any other Secured Party provided by law or under the Credit Agreement, the other Loan
Documents or other applicable agreements or instruments. The making of the Loans and other Credit Extensions pursuant to the Credit Agreement shall be conclusively presumed to have been made or
extended, respectively, in reliance upon each Guarantor's guaranty of the Borrower's Liabilities pursuant to the terms hereof. Any amounts not paid when due under this Guaranty Agreement shall bear
interest at the Default Rate.

24.Notices.Any notice required or permitted hereunder or
under any Guaranty Joinder Agreement shall be given, (a) with respect to each Guarantor, at the address of the Borrower indicated in Schedule 10.02 of the
Credit Agreement and (b) with respect to the Administrative Agent or any other Secured Party, at the Administrative Agent's address indicated in
Schedule 10.02 of the Credit Agreement. All such addresses may be modified, and all such notices shall be given and shall be

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effective,
as provided inSection 10.02of the Credit Agreement for the giving and effectiveness of notices and modifications of addresses
thereunder.

25.Joinder.Each Person who shall at any time execute and
deliver to the Administrative Agent a Guaranty Joinder Agreement substantially in the form attached as Exhibit A hereto shall thereupon irrevocably, absolutely and
unconditionally become a party hereto and obligated hereunder as a Guarantor, and all references herein and in the other Loan Documents to the Guarantors or to the parties to this Guaranty Agreement
shall be deemed to include such Person as a Guarantor hereunder.

26.Governing Law; Venue; Waiver of Jury Trial.



[Signature page follows.]

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IN WITNESS WHEREOF, the parties hereto have duly executed and delivered this Guaranty Agreement as of the day and year first written
above.

| |  | ADMINISTRATIVE AGENT:                        
| |  | ---------------------------------------------
| |  | BANK OF AMERICA, N.A.,as Administrative Agent
| |  | By:                                          

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| |  | GUARANTORS:                            
| |  | ---------------------------------------
| |  | PCC STRUCTURALS, INC.                  
| |  | By:                                    
| |  | PCC AIRFOILS LLC.                      
| |  | By:                                    
| |  | PCC SPECIALTY PRODUCTS, INC.           
| |  | By:                                    
| |  | J&L FIBER SERVICES, INC.               
| |  | By:                                    
| |  | ADVANCED FORMING TECHNOLOGY, INC.      
| |  | By:                                    
| |  | WYMAN-GORDON COMPANY                   
| |  | By:                                    
| |  | PRECISION FOUNDERS INC.                
| |  | By:                                    
| |  | WYMAN-GORDON FORGINGS (CLEVELAND), INC.
| |  | By:                                    
| |  |                                        

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| |  | WYMAN-GORDON FORGINGS LP                           
| |  | ---------------------------------------------------
| |  | By WGF I LLC, its General Partner                  
| |  | By:                                                
| |  | WYMAN-GORDON INVESTMENT CASTINGS, INC.             
| |  | By:                                                
| |  | SPS TECHNOLOGIES, LCC
(f/k/a STAR ACQUISITION, LLC)
| |  | By:                                                
| |  | PCC COMPOSITES, INC.                               
| |  | By:                                                
| |  | CARMET INVESTORS, INC.                             
| |  | By:                                                
| |  | CARMET COMPANY                                     
| |  | By:                                                
| |  | WG WASHINGTON STREET LLC                           
| |  | By:                                                
| |  | WGF I LLC                                          
| |  | By:                                                
| |  |                                                    

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| |  | WGF II LLC                          
| |  | ------------------------------------
| |  | By:                                 
| |  | WG FORGINGS 3 LLC                   
| |  | By:                                 
| |  | WG FORGINGS 2 LLC                   
| |  | By:                                 
| |  | INTERNATIONAL EXTRUDED PRODUCTS, LLC
| |  | By:                                 
| |  | CANNON-MUSKEGON CORPORATION         
| |  | By:                                 
| |  | GREENVILLE METALS, INC.             
| |  | By:                                 
| |  | GREER STOP NUT, INC.                
| |  | By:                                 
| |  | HOWELL PENNCRAFT, INC.              
| |  | By:                                 
| |  |                                     

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| |  | M. ARGUESO & CO., INC.              
| |  | ------------------------------------
| |  | By:                                 
| |  | METALAC FASTENERS, INC.             
| |  | By:                                 
| |  | NSS TECHNOLOGIES, INC.              
| |  | By:                                 
| |  | SPS INTERNATIONAL INVESTMENT COMPANY
| |  | By:                                 
| |  | SPS TECHNOLOGIES WATERFORD COMPANY  
| |  | By:                                 
| |  | UNBRAKO, LLC                        
| |  | By:                                 
| |  | AVIBANK MFG., INC.                  
| |  | By:                                 

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GUARANTY JOINDER AGREEMENT

THISGUARANTY JOINDER AGREEMENT(the "Guaranty Joinder Agreement"), dated as of
April 7, 2005 is made by Air Industries Company, LLC, a California limited liability company (the "Joining Guarantor") pursuant to the terms of that certain Credit
Agreement (as amended, supplemented or restated from time to time, the "Credit Agreement"), dated as of December 9, 2003, by and among Precision Castparts Corp., an
Oregon corporation (the "Borrower"), the Lenders party thereto and the Administrative Agent (as defined therein). All capitalized terms not otherwise defined herein shall
have the meanings given to such terms in the Credit Agreement.

WHEREAS,the Joining Guarantor is a Subsidiary and required by the terms of the Credit Agreement to become a
"Guarantor" under the Credit Agreement and be joined as a party to the Guaranty; and

WHEREAS,the Joining Guarantor will materially benefit directly and indirectly from the credit facilities made available and to be made
available to the Borrower by the Lenders under the Credit Agreement;

NOW, THEREFORE,the Joining Guarantor hereby agrees as follows, for the benefit of the Secured Parties (as defined in the Guaranty and
including any Lender or Affiliate of any Lender party to a Related Swap Contract):

1.Joinder.The Joining Guarantor
hereby irrevocably, absolutely and unconditionally becomes a party to the Guaranty as a Guarantor and bound by all the terms, conditions, obligations, liabilities and undertakings of each Guarantor or
to which each Guarantor is subject thereunder, including without limitation the joint and several, unconditional, absolute, continuing and irrevocable guarantee to the Administrative Agent for the
benefit of the Secured Parties of the payment and performance in full of the Borrower's Liabilities (as defined in the Guaranty) whether now existing or hereafter arising, all with the same force and
effect as if the Joining Guarantor were a signatory to the Guaranty.

2.Affirmations.The Joining
Guarantor hereby acknowledges and reaffirms as of the date hereof with respect to itself, its properties and its affairs each of the waivers, representations, warranties, acknowledgements and
certifications applicable to any Guarantor contained in the Guaranty.

3.Severability.The provisions of
this Guaranty Joinder Agreement are independent of and separable from each other. If any provision hereof shall for any reason be held invalid or unenforceable, such invalidity or unenforceability
shall not affect the validity or enforceability of any other provision hereof, but this Guaranty Joinder Agreement shall be construed as if such invalid or unenforceable provision had never been
contained herein.

4.Counterparts.This Guaranty
Joinder Agreement may be executed in any number of counterparts each of which when so executed and delivered shall be deemed an original, and it shall not be necessary in making proof of this Guaranty
Joinder Agreement to produce or account for more than one such counterpart executed by the Joining Guarantor. Without limiting the foregoing provisions of this
Section 4, the provisions of Section 10.02(b) of the Credit Agreement shall be applicable to this Guaranty Joinder Agreement.

5.Delivery.Joining Guarantor
hereby irrevocably waives notice of acceptance of this Guaranty Joinder Agreement and acknowledges that the Borrower's Liabilities are and shall be deemed to be incurred, and credit extensions under
the Loan Documents made and maintained, in reliance on this Guaranty Joinder Agreement and the Guarantor's joinder as a party to the Guaranty as herein provided.

6.Governing Law; Venue; Waiver of Jury
Trial.The provisions of Section 26 of the Guaranty are hereby incorporated by reference as if fully set forth
herein.

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IN WITNESS WHEREOF,the Joining Guarantor has duly executed and delivered this Guaranty Joinder Agreement as of the day and year first
written above.

| |  | JOINING GUARANTOR:                                                               
| |  | ---------------------------------------------------------------------------------
| |  | AIR INDUSTRIES COMPANY, LLC                                                      
| |  | By:                                                                              
| |  | Name: Geoffrey A. Hawkes
Title: Vice President, Treasurer and Assistant Secretary

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EXHIBIT A

Form of Guaranty Joinder Agreement

GUARANTY JOINDER AGREEMENT

THISGUARANTY JOINDER AGREEMENT(the "Guaranty Joinder Agreement"), dated as of
                        , 20  is made
by                        ,
a                        (the "Joining Guarantor") pursuant to the terms of that certain Credit Agreement (as
amended, supplemented or restated from time to time, the "Credit Agreement"), dated as of December     , 2003, by and among Precision Castparts Corp., an
Oregon corporation (the "Borrower"), the Lenders party thereto and the Administrative Agent (as defined therein). All capitalized terms not otherwise defined herein shall
have the meanings given to such terms in the Credit Agreement.

WHEREAS,the Joining Guarantor is a Subsidiary and required by the terms of the Credit Agreement to become a
"Guarantor" under the Credit Agreement and be joined as a party to the Guaranty; and

WHEREAS,the Joining Guarantor will materially benefit directly and indirectly from the credit facilities made available and to be made
available to the Borrower by the Lenders under the Credit Agreement;

NOW, THEREFORE,the Joining Guarantor hereby agrees as follows, for the benefit of the Secured Parties (as defined in the Guaranty and
including any Lender or Affiliate of any Lender party to a Related Swap Contract):

1.Joinder.The Joining Guarantor
hereby irrevocably, absolutely and unconditionally becomes a party to the Guaranty as a Guarantor and bound by all the terms, conditions, obligations, liabilities and undertakings of each Guarantor or
to which each Guarantor is subject thereunder, including without limitation the joint and several, unconditional, absolute, continuing and irrevocable guarantee to the Administrative Agent for the
benefit of the Secured Parties of the payment and performance in full of the Borrower's Liabilities (as defined in the Guaranty) whether now existing or hereafter arising, all with the same force and
effect as if the Joining Guarantor were a signatory to the Guaranty.

2.Affirmations.The Joining
Guarantor hereby acknowledges and reaffirms as of the date hereof with respect to itself, its properties and its affairs each of the waivers, representations, warranties, acknowledgements and
certifications applicable to any Guarantor contained in the Guaranty.

3.Severability.The provisions of
this Guaranty Joinder Agreement are independent of and separable from each other. If any provision hereof shall for any reason be held invalid or unenforceable, such invalidity or unenforceability
shall not affect the validity or enforceability of any other provision hereof, but this Guaranty Joinder Agreement shall be construed as if such invalid or unenforceable provision had never been
contained herein.

4.Counterparts.This Guaranty
Joinder Agreement may be executed in any number of counterparts each of which when so executed and delivered shall be deemed an original, and it shall not be necessary in making proof of this Guaranty
Joinder Agreement to produce or account for more than one such counterpart executed by the Joining Guarantor. Without limiting the foregoing provisions of this
Section 4, the provisions of Section 10.02(b) of the Credit Agreement shall be applicable to this Guaranty Joinder Agreement.

5.Delivery.Joining Guarantor
hereby irrevocably waives notice of acceptance of this Guaranty Joinder Agreement and acknowledges that the Borrower's Liabilities are and shall be deemed to be incurred, and credit extensions under
the Loan Documents made and maintained, in reliance on this

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Guaranty
Joinder Agreement and the Guarantor's joinder as a party to the Guaranty as herein provided.

6.Governing Law; Venue; Waiver of Jury
Trial.The provisions of Section 26 of the Guaranty are hereby incorporated by reference as if fully set forth
herein.

[Signature page follows.]

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IN WITNESS WHEREOF, the Joining Guarantor has duly executed and delivered this Guaranty Joinder Agreement as of the day and year first
written above.

| |  | JOINING GUARANTOR:
| |  | ------------------
| |  |                   
| |  | By:               
| |  | Name:             
| |  | Title:            

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