Description
Spiral point tap with chamfer form B with a 3.5-5xP plug lead, for Unified National Coarse thread UNC 5/16″ with 18 TPI and 0.005″ oversize equivalent to H11 pitch diameter limits, dimensions according to ANSI standard with 0.3180″ shank and 0.2380″ square drive, powder metallurgical HSS-E with steam tempered surface finish for 2.5xD through hole threading in general purpose applications.
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