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BA thread refers to the type of thread called BA in the British Standard BS, and the thread angle is 47.5 degrees.
For example, if size is "2BA", then 2 represents the size number.
The size of the pitch is determined by the size number, and in the case of the size number 2, the size is as follows.
[ size Number 2]
Pitch 0.8100mm
external thread Outer Diameter internal thread core diameter 4.700mm
Effective diameter: 4.215mm
external thread Diameter of valley internal thread minor diameter 3.730mm
Thread angle: 47.5 degrees
The tap will be a special product.