Description
Spiral flute tap with chamfer form C with a 2-3xP semi-bottoming lead, for Unified National Coarse thread UNC 1/2″ with 13 TPI and 3B class of fit with H3 pitch diameter limits, dimensions according to ANSI standard with 0.3670″ shank and 0.2750″ square drive, powder metallurgical HSS-E with steam tempered surface finish and 45 Degree helix angle for 2.5xD blind hole threading in general purpose applications.
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