BA Thread Gauges

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

B.A. No. Pitch in mm Type of Thread Gauges used
2 0.81 Thread Plug GaugesTolerance class :
  • Normal (N)
  • Close (C)
Thread Ring GaugesTolerance class :
  • Normal (N)
  • Close (C)
Check Plug Gauges to check NEW Ring Gauges.
Tolerance class :
  • Normal (N)
  • Close (C)
Wear Check Plug Gauges to check / calibrate used Ring Gauges.
Tolerance class :
  • Normal (N)
  • Close (C)
3 0.73
4 0.66
5 0.59
6 0.53
7 0.48