BA Thread Gauges

BA (British Association) Threads are used for fine fastening purpose especially in instruments.

Specification :

Basic Dimensions – BS 93 : 1951 & Gauging Practice – BS 919 Part II : 2007.

Manufacturing Range :

Thread Plug Gauges, Thread Ring Gauges, Check Plug & Wear Check Plug Gauges for sizes 2, 3, 4, 5, 6, 7

 Pitch in mmType of Thread Gauges used   
20.81Thread Plug Gauges Tolerance class :


Thread Ring Gauges Tolerance class :
Check Plug Gauges to check NEW Ring Gauges.
Tolerance class :
Wear Check Plug Gauges to check / calibrate used Ring Gauges.
Tolerance class :
30.73
40.66Normal (N)Normal (N)Normal (N)Normal (N)
50.59
60.53Close (C)Close (C)Close (C)Close (C)
70.48