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+1 (217) 579-8045Spiral point tap with a 3-6xP plug lead, for Unified National Coarse thread UNC 1/4" with 20 TPI and 2B class of fit with H5 pitch diameter limits, dimensions according to ANSI standard with 0.2550" shank and 0.1910" square drive, HSS with TiN coating for 2.5xD through hole threading in ferritic, martensitic and austenitic stainless steel, non-ferrous metals and Fe-based, Ni-based and Co-based high-temperature alloys.