Gages

BA Thread Ring Gages

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

PART#	PRODUCT NAME	CLASS-OF-FIT	PITCH	STANDARD	PRICE	PRICE
BATRG0	BA Go/NoGo Thread Ring	1	Normal	BS 93 & BS 919	call
BATRGDE0	BA Thread Ring Gage Set	1	Normal	BS 93 & BS 919	call
BATRG1	BA Go/NoGo Thread Ring	0.9	Normal	BS 93 & BS 919	call
BATRGDE1	BA Thread Ring Gage Set	0.9	Normal	BS 93 & BS 919	call
BATRG2	BA Go/NoGo Thread Ring	0.81	Normal	BS 93 & BS 919	call
BATRGDE2	BA Thread Ring Gage Set	0.81	Normal	BS 93 & BS 919	call
BATRG3	BA Go/NoGo Thread Ring	0.73	Normal	BS 93 & BS 919	call
BATRGDE3	BA Thread Ring Gage Set	0.73	Normal	BS 93 & BS 919	call
BATRG4	BA Go/NoGo Thread Ring	0.66	Normal	BS 93 & BS 919	call
BATRGDE4	BA Thread Ring Gage Set	0.66	Normal	BS 93 & BS 919	call
BATRG5	BA Go/NoGo Thread Ring	0.59	Normal	BS 93 & BS 919	call
BATRGDE5	BA Thread Ring Gage Set	0.59	Normal	BS 93 & BS 919	call
BATRG6	BA Go/NoGo Thread Ring	0.53	Normal	BS 93 & BS 919	call
BATRGDE6	BA Thread Ring Gage Set	0.53	Normal	BS 93 & BS 919	call
BATRG7	BA Go/NoGo Thread Ring	0.48	Normal	BS 93 & BS 919	call
BATRGDE7	BA Thread Ring Gage Set	0.48	Normal	BS 93 & BS 919	call
BATRG8	BA Go/NoGo Thread Ring	0.43	Normal	BS 93 & BS 919	call
BATRGDE8	BA Thread Ring Gage Set	0.43	Normal	BS 93 & BS 919	call
BATRG9	BA Go/NoGo Thread Ring	0.39	Normal	BS 93 & BS 919	call
BATRGDE9	BA Thread Ring Gage Set	0.39	Normal	BS 93 & BS 919	call
BATRG10	BA Go/NoGo Thread Ring	0.35	Normal	BS 93 & BS 919	call
BATRGDE10	BA Thread Ring Gage Set	0.35	Normal	BS 93 & BS 919	call

Product Description

BA also is known as British Association. The British Standards Association recommends this thread form for screws smaller than ¼ inch rather than using BSW and BSF threads. This gage checks British Association external 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 ring gages conform to S.93. Tolerances are to BS.919 Part 2 2007. BA screw thread ring gages are manufactured to nominal 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 Ring 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.