Spiral point tap with chamfer form B with a 3.5-5xP second lead, for British Standard Fine thread BSF 1/4" with 26 TPI and Medium class of fit, dimensions according to ISO 529 standard with 6.3mm shank and 5.0mm square drive, HSS with steam tempered surface finish for 2.5xD through hole threading in plain carbon and alloy steel and ferritic and austenitic stainless steel
Applications:
P - Steel and cast steel(steels with alloy content ? 10% and a hardness of < 45HRC) - Primary use
M - Stainless steel(corrosion resistant steels with ? 11% chromium content) - Primary use
K - Cast Iron(castings of iron and carbon alloys with > 2% carbon content) - Possible use
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