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WESTport Corp.

Thread Gages


Thread Gages also referred to as Thread Gauges are used to check the outside major diameter and pitch diameter limits on threaded parts. They are also used to check the inside major diameter and pitch diameter limits on threaded parts. Thread gages are available in GO and NOGO. The GO thread gage should go on or in a threaded component and the NOGO should not. They are used to inspect pitch diameter and the functional thread. Thread gages determine if the product threads pass or fail inspection.


  • Buy with confidence with WESTport 100% satisfaction guarantee
  • Free technical support from our knowledgeable engineering team with over 100+ years’ experience
  • Thread gages are AGD – American Gage Design
  • GO or NOGO members
  • Precision hand lapped and polished to ensure superior accuracy
  • ASME/ANSI B1.2 and ANSI B1.16M compliant
  • Manufactured with gage blanks per ASME/ANSI B47.1
  • Free NIST certificate of accuracy with all thread gages

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Thread Plug Gage PDF Catalog

WESTport Manufactured Products. 24th Anniversary Servicing Industry Worldwide (1989-2013)