Overall length L Thread length ℓ Thread + Neck length ℓn Shank length ℓs Shank dia. Ds Size of square K Length of square ℓk ⑥ DIN Size Class Code Chamfer L ℓ ℓn ℓs Ds K ℓk Lobe TYPE Spiral Fluted Taps (for blind hole) (mm) (mm) (mm) (mm) (mm) (mm) (mm) ① M16 × 1.5 ISO2X RM016OBOCTB 2P 100 18 - 51 12 9 12 8 3 M18 × 1.5 ISO2X RM018OBOCTP 4P 110 20 - 56 14 11 14 8 3 M18 × 1.5 ISO2X RM018OBOCTB 2P 110 20 - 56 14 11 14 8 3 M20 × 1.5 ISO2X RM020OBOCTP 4P 125 20 - 64 16 12 15 8 3 Spiral Fluted Taps (for through hole) M20 × 1.5 ISO2X RM020OBOCTB 2P 125 20 - 64 16 12 15 8 3 ② Number of oil grooves: M  6 = 5, M8 = 6, M10 and larger = 8 For M6 and smaller, external centers of 2 thread chamfer taps are removed. Spiral Pointed Taps (for through hole) ③ Hand Taps ④ Cemented Carbide Taps ⑤ Roll Taps ⑥ Special Thread Taps Simple Inspection Tools ⑦ Pipe Taps ⑧ Thread Mills Premium Thread Mills ⑨ Dies ⑩ Center Drills Centering Tools ⑪ DIN ※ This product is different from JIS products in shape and dimensions, please be careful when using. ⑥-12