Skip to Store Area:

WESTport Corp.



BA Thread Plug Gages

Double click on above image to view full picture

Zoom Out
Zoom In

BA Thread Plug Gages

  • British Association
  • Checks small parts under 1/4 inch
  • Manufactured to standard class


Part# Product Name Class-of-Fit Pitch Standard Price
BATPG0 BA Go/NoGo Thread Plug 1 Normal BS 93 & BS 919 Call
BATPGDE0 BA Thread Plug Gage Set 1 Normal BS 93 & BS 919 Call
BATPG1 BA Go/NoGo Thread Plug 0.9 Normal BS 93 & BS 919 Call
BATPGDE1 BA Thread Plug Gage Set 0.9 Normal BS 93 & BS 919 Call
BATPG2 BA Go/NoGo Thread Plug 0.81 Normal BS 93 & BS 919 Call
BATPGDE2 BA Thread Plug Gage Set 0.81 Normal BS 93 & BS 919 Call
BATPG3 BA Go/NoGo Thread Plug 0.73 Normal BS 93 & BS 919 Call
BATPGDE3 BA Thread Plug Gage Set 0.73 Normal BS 93 & BS 919 Call
BATPG4 BA Go/NoGo Thread Plug 0.66 Normal BS 93 & BS 919 Call
BATPGDE4 BA Thread Plug Gage Set 0.66 Normal BS 93 & BS 919 Call
BATPG5 BA Go/NoGo Thread Plug 0.59 Normal BS 93 & BS 919 Call
BATPGDE5 BA Thread Plug Gage Set 0.59 Normal BS 93 & BS 919 Call
BATPG6 BA Go/NoGo Thread Plug 0.53 Normal BS 93 & BS 919 Call
BATPGDE6 BA Thread Plug Gage Set 0.53 Normal BS 93 & BS 919 Call
BATPG7 BA Go/NoGo Thread Plug 0.48 Normal BS 93 & BS 919 Call
BATPGDE7 BA Thread Plug Gage Set 0.48 Normal BS 93 & BS 919 Call
BATPG8 BA Go/NoGo Thread Plug 0.43 Normal BS 93 & BS 919 Call
BATPGDE8 BA Thread Plug Gage Set 0.43 Normal BS 93 & BS 919 Call
BATPG9 BA Go/NoGo Thread Plug 0.39 Normal BS 93 & BS 919 Call
BATPGDE9 BA Thread Plug Gage Set 0.39 Normal BS 93 & BS 919 Call
BATPG10 BA Go/NoGo Thread Plug 0.35 Normal BS 93 & BS 919 Call
BATPGDE10 BA Thread Plug Gage Set 0.35 Normal BS 93 & BS 919 Call


BA also is known as British Association. This standard thread form is recommended for screws smaller than ¼ inch. It is used for small parts instead of BSW and BSF threads. BA threads are similar to Whitworth threads in terms of rounded crests and roots except that the symmetrical angles are 47 degrees and 30 minutes and the crest and root radiuses are proportionately larger. BA thread plug gages conform to S.93. Tolerances are to BS.919 Part 2 2007. BA screw thread plug gages are manufactured to standard class. All BA thread gages are right hand only. This thread form is rarely used in the United States.
WESTport provides a complete line of BA (British Association) Thread Plug Gages. They are available in sizes from BA 0 to BA 16. 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)