Skip to Store Area:

WESTport Corp.



BSW Thread Ring Gages

Double click on above image to view full picture

Zoom Out
Zoom In

BSW Thread Ring Gages

  • British Standard Whitworth
  • Checks external parallel threads


Part# Product Name Size TPI Price
BSWTRG1 BSW Go/NoGo Thread Ring 1/8 40 Call
BSWTRGS1 BSW Thread Ring Gage Set 1/8 40 Call
BSWTRG2 BSW Go/NoGo Thread Ring 3/16 24 Call
BSWTRGS2 BSW Thread Ring Gage Set 3/16 24 Call
BSWTRG3 BSW Go/NoGo Thread Ring 1/4 20 Call
BSWTRGS3 BSW Thread Ring Gage Set 1/4 20 Call
BSWTRG4 BSW Go/NoGo Thread Ring 5/16 18 Call
BSWTRGS4 BSW Thread Ring Gage Set 5/16 18 Call
BSWTRG5 BSW Go/NoGo Thread Ring 3/8 16 Call
BSWTRGS5 BSW Thread Ring Gage Set 3/8 16 Call
BSWTRG6 BSW Go/NoGo Thread Ring 7/16 14 Call
BSWTRGS6 BSW Thread Ring Gage Set 7/16 14 Call
BSWTRG7 BSW Go/NoGo Thread Ring 1/2 12 Call
BSWTRGS7 BSW Thread Ring Gage Set 1/2 12 Call
BSWTRG8 BSW Go/NoGo Thread Ring 9/16 12 Call
BSWTRGS8 BSW Thread Ring Gage Set 9/16 12 Call
BSWTRG9 BSW Go/NoGo Thread Ring 5/8 11 Call
BSWTRGS9 BSW Thread Ring Gage Set 5/8 11 Call
BSWTRG10 BSW Go/NoGo Thread Ring 3/4 10 Call
BSWTRGS10 BSW Thread Ring Gage Set 3/4 10 Call
BSWTRG11 BSW Go/NoGo Thread Ring 7/8 9 Call
BSWTRGS11 BSW Thread Ring Gage Set 7/8 9 Call
BSWTRG12 BSW Go/NoGo Thread Ring 1 8 Call
BSWTRGS12 BSW Thread Ring Gage Set 1 8 Call
BSWTRG13 BSW Go/NoGo Thread Ring 1 1/8 7 Call
BSWTRGS13 BSW Thread Ring Gage Set 1 1/8 7 Call
BSWTRG14 BSW Go/NoGo Thread Ring 1 1/4 7 Call
BSWTRGS14 BSW Thread Ring Gage Set 1 1/4 7 Call
BSWTRG15 BSW Go/NoGo Thread Ring 1 3/8 6 Call
BSWTRGS15 BSW Thread Ring Gage Set 1 3/8 6 Call
BSWTRG16 BSW Go/NoGo Thread Ring 1 1/2 6 Call
BSWTRGS16 BSW Thread Ring Gage Set 1 1/2 6 Call


BSW also is known as British Standard Whitworth. This gage checks the external parallel screw threads that have a 55 degree included angle and is of the Whitworth form. This is an older standard and this kind of thread form is mostly used for replacement parts.
WESTport provides a complete line of BSW (British Standard Whitworth) Thread Ring Gages. They are available in sizes from 1/8 inch to 6 inches. Free Technical support is available from our core of engineers to assist you with any questions you may have.

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