|Threads Per Inch:
|P0 Bright Finish
|Imperial - BA
Taps are tools used by engineers for creating a female thread inside a hole. The tap is inserted into a special wrench and turned whilst cutting oil is used to lubricate the tap.
When forming a brand new thread in a blind hole, it is usually a three-stage process.
BA thread (British association) is a rarely used thread that was once commonly found on small instruments and models. Still sparingly used in some industries such as metering equipment manufacturing and optical equipment.
When cutting shallow female threads, it may be possible to skip the third stage and just use the taper or second taps.
If tapping into a soft material it is possible to cut the thread with only a second tap.