Overall Thread Thread+Neck Shank Shank Size of Length of length length length length dia. square square L ℓ ℓn ℓs Ds K ℓk TYPE:1 TYPE:2 (for blind hole) Spiral Fluted Taps TYPE:3 TYPE:4 (for through hole) Spiral Fluted Taps (for through hole) Spiral Pointed Taps Recommended class Hand Taps Segment:1J Size Class Code Chamfer L ℓ ℓn ℓs Ds K ℓk Lobe Type Stock Carbide Taps Cemented (mm) (mm) (mm) (mm) (mm) (mm) (mm) For Metric Threads M1 × 0.25 G4 SRZM41.0B1 1P 36 4.5 - 24 3 2.5 5 4 1 △ M1.2 × 0.25 G4 SRZM41.2B1 1P 36 4.5 - 24 3 2.5 5 4 1 △ M1.4 × 0.3 G4 SRZM41.4C1 1P 36 5.4 - 24 3 2.5 5 4 1 △ Roll Taps M1.4 × 0.2 G3 SRZM31.4A1 1P 36 3.6 - 24 3 2.5 5 4 1 △ M1.6 × 0.35 G4 SRZM41.6D1 1P 36 6.3 - 24 3 2.5 5 4 2 △ M1.6 × 0.2 G3 SRZM31.6A1 1P 36 3.6 - 24 3 2.5 5 4 2 △ M1.7 × 0.35 G4 SRZM41.7D1 1P 36 6.3 - 24 3 2.5 5 4 2 △ M2 × 0.4 G4 SRZM42.0E1 1P 42 7.2 - 27 3 2.5 5 4 3 △ Simple Inspection Tools Special Thread Taps M2.5 × 0.45 G5 SRZM52.5F1 1P 46 8.1 14 29 3 2.5 5 4 4 △ M2.6 × 0.45 G5 SRZM52.6F1 1P 46 8.1 14 29 3 2.5 5 4 4 △ M3 × 0.5 G5 SRZM53.0G1 1P 46 9 14 26 4 3.2 6 4 4 △ M4 × 0.7 G6 SRZM64.0I1 1P 52 11 17 29 5 4 7 4 4 △ Pipe Taps M5 × 0.8 G6 SRZM65.0K1 1P 60 13 22 33 5.5 4.5 7 4 4 △ M6 × 1 G6 SRZM66.0M1 1P 62 15 26 33 6 4.5 7 4 4 △ Number of oil grooves : M2.6 and smaller=non, M3 and larger=2 Thread Mills Dies Center Drills Centering Tools JIS ◎=Standard ○=Semi standard △=Made to order RO-24 For improvement, spec may change without advance notice. 519