Trusted Internal and External Thread Grinding

Par Manufacturing, Inc. has been providing precision internal and external thread grinding services to companies nation-wide for more than 60 years. We provide thread grinding services for numerous companies in the aerospace and medical industry, including Boeing, Sikorsky Aircraft, Pratt and Whitney Engines, and many more. Our owner-operator and his team have many years of experience. We take pride in our workmanship, quality, fast turnaround time and competitive pricing.

About Our Internal and External Thread Grinding Business

We Offer the Following in External Thread Grinding:

60" Continuous Lead
Acme Thread Form 29o
Buttress Thread Form 7o - 45o
Grind up to 12.375" OD
Metric Threads
RH or LH AN Thread Form 60o
Swing up to 22"
Up to 72" On Centers

Special Pitches and Forms We Offer:

All Mil Standards J Thread Series
Multiple Lead

Our Internal Thread

Grinding Includes:

44" Maximum Part Length
5" Continuous Thread Length
Acme Thread Form 29o
Buttress Thread Form 7o - 45o
Maximum Bore Ground 9.50"
Metric Threads
Minimum Bore Ground .750"
RH or LH AN Thread Form 60o
Swing Up To 12

Quality Control We Offer:

Mil Spec 45208A and 45662
Thread Mil Spec 8879 and 7742

We Also Offer the Following Services:

Cylindrical Grinding, ID and OD
Thread Plug Gages