Spiral Fluted Taps (for blind hole)Spiral Fluted Taps(for through hole)Spiral Pointed Taps(for through hole)Hand TapsCementedCarbide TapsRoll TapsSpecial Thread TapsSimple Inspection ToolsPipe TapsThread MillsPremium Thread MillsDiesCenter DrillsCentering Tools ⑥ Roll Tap Series Overall Thread Thread + Neck Shank Shank Size of Length oflengthlengthlengthlengthdia.squaresquareLℓℓnℓsDsKℓk ANSI N-RZ Roll Taps for Steels ① Size Class Code Chamfer L (inch) ℓ(inch) ℓn(inch) ℓs(inch) Ds(inch) K(inch) ℓk(inch) Lobe TYPE1/2-13UNCH5389506M4P4.3311.024-2.2050.3670.2750.43784 1/2-13UNC H5 389504M 2P 4.331 1.024 - 2.205 0.367 0.275 0.437 8 4 1/2-13UNC H7 389507M 4P 4.331 1.024 - 2.205 0.367 0.275 0.437 8 4 1/2-13UNC H7 389505M 2P 4.331 1.024 - 2.205 0.367 0.275 0.437 8 4 ② 1/2-20UNF H5 389510M 4P 4.331 1.024 - 2.205 0.367 0.275 0.437 8 4 1/2-20UNF H5 389508M 2P 4.331 1.024 - 2.205 0.367 0.275 0.437 8 4 1/2-20UNF H7 389511M 4P 4.331 1.024 - 2.205 0.367 0.275 0.437 8 4 1/2-20UNF H7 389509M 2P 4.331 1.024 - 2.205 0.367 0.275 0.437 8 4 Number of oil grooves : Metric thread : M3 〜 M7 = 4, M8 = 3, M10 and larger = 4 ③ Unified thread : No.4 and smaller = non, No.5 〜 1/4 = 4, 5/16 〜 3/8 = 3, 7/16 and larger = 4For M6, 1/4 and smaller with 2P chamfer, the external center is cut off. ④ ⑤ ⑥ ⑦ ⑧ ⑨ ⑩ ⑪ ANSI ⑥-21 ※ This product is different from JIS products in shape and dimensions, please be careful when using.