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 :
|
Thread Ring GaugesTolerance class :
|
Check Plug Gauges to check NEW Ring Gauges. Tolerance class :
|
Wear Check Plug Gauges to check / calibrate used Ring Gauges. Tolerance class :
|
3 | 0.73 | ||||
4 | 0.66 | ||||
5 | 0.59 | ||||
6 | 0.53 | ||||
7 | 0.48 |