Overall Thread Thread+Neck Shank Shank Size of Length of length length length length dia. square square L ℓ ℓn ℓs Ds K ℓk N-RZ Thread Forming Taps for Steels Size Class Code Chamfer L ℓ ℓn ℓs Ds K ℓk Lobe Type (for blind hole) Spiral Fluted Taps (inch) (inch) (inch) (inch) (inch) (inch) (inch) RSU08N5HEXP 4P H5 RSU08N5HEXB 2P 1/2-20UNF 4.331 1.024 - 2.205 0.367 0.275 0.437 8 4 RSU08N7HEXP 4P H7 (for through hole) Spiral Fluted Taps RSU08N7HEXB 2P (for through hole) Spiral Pointed Taps Hand Taps Carbide Taps Cemented Roll Taps Simple Inspection Tools Pipe Taps Thread Mills Dies Center Drills Centering Tools ANSI RO-4 285