Drill Shank Overall Cut Rmax Rmin dia. dia. length length (mm) (mm) Dc Ds L ℓ - - CEIR (for blind hole) Spiral Fluted Taps High Helix Center Drills-JIS Type R Specification (for through hole) Spiral Fluted Taps For icon explanation, refer to P.50 TYPE:1 (for through hole) Spiral Pointed Taps Hand Taps Segment:51 Carbide Taps Cemented Size Code Ds L ℓ Rmax Rmin Type Stock Dc ×θ× Ds (mm) (mm) (mm) (mm) (mm) 1 × R × 3.15 CE1.0RI 3.15 31.5 3 3.15 2.5 1 ◎ 1.25 × R × 3.15 CE1.25RI 3.15 31.5 3.35 4 3.15 1 ◎ 1.6 × R × 4 CE1.6RI 4 35.5 4.25 5 4 1 ◎ Roll Taps 2×R×5 CE2.0RI 5 40 5.3 6.3 5 1 ◎ 2.5 × R × 6.3 CE2.5RI 6.3 45 6.7 8 6.3 1 ◎ 3.15 × R × 8 CE3.15RI 8 50 8.5 10 8 1 ◎ 4 × R × 10 CE4.0RI 10 56 10.6 12.5 10 1 ◎ Simple Inspection Tools Special Thread Taps 5 × R × 12.5 CE5.0RI 12.5 63 13.2 16 12.5 1 ◎ 6.3 × R × 16 CE6.3RI 16 71 17 20 16 1 ◎ 8 × R × 20 CE8.0RI 20 80 21.2 25 20 1 ◎ 10 × R × 25 CE010RI 25 100 26.5 31.5 25 1 ◎ Pipe Taps Thread Mills Dies Center Drills Centering Tools JIS ◎=Standard ○=Semi standard △=Made to order CE-22 For improvement, spec may change without advance notice. 661