Left Hand Whitworth BSW Serial Form 1/4 x 20 tap set of three 1/4" LH

Description

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Left Hand
Whitworth BSW Serial Form 1/4 x 20 tap set of three 1/4" LH
Taps are to din 352 HSS-G Tolerance ISO2/6H
This form of Hand Tap consists of 3 taps for Whitworth BSW threads made up of a Roughing Tap a Mid Rougher and a Finishing tap (see below for more information).
This form of tap is ideal for tougher materials because the thread is formed in stages as opposed to NON serial taps which form the thread in one pass and use the conventional Taper Second and plug.
The roughing tap which takes out half the
thread area is marked with a ring on the shank for identification.
The Mid-Rougher which takes out to 75% of the area of the thread is
marked with two rings on the shank. Only the plain shanked
Finish tap cuts SIZE. This form of hand tap is recommended for
materials like stainless steel and non-abrasive materials up to 900N/mm2
Left Hand Whitworth BSW Serial Form 1/4 x 20 tap set of three 1/4" LH Taps are to din 352 HSS-G Tolerance ISO2/6H This form of Hand Tap consists of 3 taps for Whitworth BSW threads made up of a Roughing Tap a Mid Rougher and a Finishing tap (see below for more information). This form of tap is ideal for tougher materials because the thread is formed in stages as opposed to NON serial taps which form the thread in one pass and use the conventional Taper Second and plug. thread area is marked with a ring on the shank for identification. The Mid-Rougher which takes out to 75% of the area of the thread is   marked with two rings on the shank. Only the plain shanked Finish tap cuts SIZE. This form of hand tap is recommended for materials like stainless steel and non-abrasive materials up t