Exhibit 10.5



 Exhibit 10.5 

JOINDER AGREEMENT 
 October 19, 2015 

SunTrust Robinson Humphrey, Inc. 
 as
Representative of the Initial Purchasers 
 3333 Peachtree Street, 10th Floor 

Atlanta, GA 30308 
 Reference is made to that
registration rights agreement (the “Registration Rights Agreement”) dated as of October 19, 2015 among NN, Inc., a Delaware corporation (the “Company”), the NN Guarantors, and SunTrust Robinson Humphrey, Inc.,
as the Representative, relating to the issuance and sale to the Initial Purchasers of $300,000,000 aggregate principal amount of the Company’s 10.25% Senior Notes due 2020 (the “Notes”). Capitalized terms used herein and not
otherwise defined herein shall have the meanings ascribed to such terms in the Registration Rights Agreement. 
 The Registration Rights
Agreement contemplates that substantially concurrently with the consummation of the Acquisition, Precision Engineered Products Holdings, Inc. and each of its subsidiaries that guarantee the Notes will becomes parties to the Registration Rights
Agreement by executing this Registration Rights Joinder. 
 1. Joinder. Each of the undersigned hereby acknowledges that it has
received and reviewed a copy of the Registration Rights Agreement and all other documents it requires to enter into this Joinder Agreement (the “Registration Rights Joinder”), and acknowledges and agrees to (i) join and become
a party to the Registration Rights Agreement as indicated by its signature below; (ii) be bound by all covenants, agreements, representations, warranties and acknowledgements attributable to a Guarantor in the Registration Rights Agreement as
if made by, and with respect to, each Guarantor signatory hereto; and (iii) perform all obligations and duties required of a Guarantor pursuant to the Registration Rights Agreement. 

2. Counterparts. This Registration Rights Joinder may be signed in one or more counterparts (which may be delivered in original form or
facsimile or “pdf” file thereof), each of which shall constitute an original when so executed and all of which together shall constitute one and the same agreement. 

3. Amendments. No amendment or waiver of any provision of this Registration Rights Joinder, nor any consent or approval to any
departure therefrom, shall in any event be effective unless the same shall be in writing and signed by the parties thereto. 
 4.
Headings. The section headings used herein are for convenience only and shall not affect the construction hereof. 
 5. APPLICABLE
LAW. THIS REGISTRATION RIGHTS JOINDER SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK, WITHOUT REGARD TO THE CONFLICTS OF LAW RULES THEREOF. 







 IN WITNESS WHEREOF, each of the undersigned has cause this Registration Rights Joinder to be duly
executed and delivered, by its proper and duly authorized officer as of the date set forth above. 
  

			
	PRECISION ENGINEERED PRODUCTS HOLDINGS, INC.
		
	By:	 	 /s/ James H. Dorton

		 	Name: James H. Dorton
		 	Title: Vice President
	
	PRECISION ENGINEERED PRODUCTS LLC
		
	By:	 	 /s/ James H. Dorton

		 	Name: James H. Dorton
		 	Title: Vice President
	
	BRAININ-ADVANCE INDUSTRIES LLC
		
	By:	 	 /s/ James H. Dorton

		 	Name: James H. Dorton
		 	Title: Vice President
	
	POLYMETALLURGICAL LLC
		
	By:	 	 /s/ James H. Dorton

		 	Name: James H. Dorton
		 	Title: Vice President
	
	BOSTON ENDO-SURGICAL TECHNOLOGIES LLC
		
	By:	 	 /s/ James H. Dorton

		 	Name: James H. Dorton
		 	Title: Vice President


 [Signature Page to Joinder to the Registration Rights Agreement] 







 
			
	LACEY MANUFACTURING COMPANY, LLC
		
	By:	 	 /s/ James H. Dorton

		 	Name: James H. Dorton
		 	Title: Vice President
	
	CONNECTICUT PLASTICS LLC
		
	By:	 	 /s/ James H. Dorton

		 	Name: James H. Dorton
		 	Title: Vice President
	
	WAUCONDA TOOL & ENGINEERING LLC
		
	By:	 	 /s/ James H. Dorton

		 	Name: James H. Dorton
		 	Title: Vice President
	
	ADVANCED PRECISION PRODUCTS, INC.
		
	By:	 	 /s/ James H. Dorton

		 	Name: James H. Dorton
		 	Title: Vice President
	
	HOWESTEMCO, LLC
		
	By:	 	 /s/ James H. Dorton

		 	Name: James H. Dorton
		 	Title: Vice President
	
	PREMCO, INC.
		
	By:	 	 /s/ James H. Dorton

		 	Name: James H. Dorton
		 	Title: Vice President


 [Signature Page to Joinder to the Registration Rights Agreement] 







 
			
	PROFILES INCORPORATED
		
	By:	 	 /s/ James H. Dorton

		 	Name: James H. Dorton
		 	Title: Vice President
	
	HOLMED, LLC
		
	By:	 	 /s/ James H. Dorton

		 	Name: James H. Dorton
		 	Title: Vice President
	
	GENERAL METAL FINISHING LLC
		
	By:	 	 /s/ James H. Dorton

		 	Name: James H. Dorton
		 	Title: Vice President
	
	MATRIX I, LLC
		
	By:	 	 /s/ James H. Dorton

		 	Name: James H. Dorton
		 	Title: Vice President
	
	TRIGON INTERNATIONAL LLC
		
	By:	 	 /s/ James H. Dorton

		 	Name: James H. Dorton
		 	Title: Vice President


 [Signature Page to Joinder to the Registration Rights Agreement]