Overall Chamfer + Thread Thread+Neck Shank Shank Size of Length of length full thread length length length dia. square square L ℓt ℓ ℓn ℓs Ds K ℓk F-SP (for blind hole) Spiral Fluted Taps Spiral Fluted Taps for High Speed Tapping Specification (for through hole) Spiral Fluted Taps ■Spiral Fluted Tap applicable for such high speed tapping E Coating as 15m/min to 25m/min. Under low tapping speed, poor chip shape and poor chip ejection may occur and cause tapping troubles. Recommended Tapping Speeds depending on Materials (for through hole) Spiral Pointed Taps Free cutting and Carbon steel and structural steel low alloy steel IS P IS P 15〜25 15〜25 (m/min) (m/min) For icon explanation, refer to P.50 Hand Taps TYPE:1 DIN371 Carbide Taps Cemented TYPE:2 YAMAWA TYPE:3 DIN376 / DIN374 Roll Taps Segment:1C Simple Inspection Tools Special Thread Taps Size Class Code Chamfer L ℓt ℓ ℓn ℓs Ds K ℓk No. of Type Stock Pipe Taps (mm) (mm) (mm) (mm) (mm) (mm) (mm) (mm) flutes For Metric Threads M3 × 0.5 ISO2X SD3.0GBNEV 2.5P 56 5 9 18 34 3.5 2.7 6 3 1 ● M4 × 0.7 ISO2X SD4.0IBNEV 2.5P 63 7 13 21 38 4.5 3.4 6 3 1 ● M5 × 0.8 ISO2X SD5.0KBNEV 2.5P 70 9 14 25 39 6 4.9 8 3 1 ● Thread Mills M6 × 1 ISO2X SY6.0MBNEV 2.5P 80 11 15 30 45 6 4.9 8 3 2 ● M8 × 1.25 ISO2X SY8.0NBNEV 2.5P 90 - 12 35 48 8 6.2 9 3 2 ● M10 × 1.5 ISO2X SY010OBNEV 2.5P 100 - 13 39 53 10 8 11 3 2 ● M10 × 1.25 ISO2X SY010NBNEV 2.5P 100 - 13 39 53 10 8 11 3 2 ● SY012PBNEV 2.5P 110 - 15 45 56 12 9 12 3 2 ● Dies M12 × 1.75 ISO2X SG012PBNEV 2.5P 110 - 15 - 56 9 7 10 3 3 SY012OBNEV 2.5P 110 - 15 45 56 12 9 12 3 2 ● M12 × 1.5 ISO2X SM012OBNEV 2.5P 100 - 15 - 51 9 7 10 3 3 SY012NBNEV 2.5P 110 - 15 45 56 12 9 12 3 2 ● Center Drills M12 × 1.25 ISO2X SM012NBNEV 2.5P 100 - 15 - 51 9 7 10 3 3 Centering Tools DIN SP-42 93