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 SP Spiral Fluted Taps Size Class Code Chamfer L ℓ ℓn ℓs Ds K ℓk No. of Type Stock (for blind hole) Spiral Fluted Taps (mm) (mm) (mm) (mm) (mm) (mm) (mm) flutes M35 × 2 P3 SPMR035Q 2.5P 155 52 - 71 28 21 24 4 7 △ M35 × 1.5 P3 SPMR035O 2.5P 155 26 - 71 28 21 24 4 8 △ M35 × 1 P2 SPMQ035M 2.5P 155 26 - 71 28 21 24 4 8 △ M36 × 4 P4 SPMS036U 2.5P 155 52 - 71 28 21 24 4 7 ◎ (for through hole) Spiral Fluted Taps M36 × 3 P3 SPMR036S 2.5P 155 52 - 71 28 21 24 4 7 △ M36 × 2 P3 SPMR036Q 2.5P 155 52 - 71 28 21 24 4 7 △ M36 × 1.5 P3 SPMR036O 2.5P 155 26 - 71 28 21 24 4 8 △ M36 × 1 P2 SPMQ036M 2.5P 155 26 - 71 28 21 24 4 8 △ (for through hole) Spiral Pointed Taps M38 × 3 P3 SPMR038S 2.5P 165 52 - 76 30 23 26 4 7 △ M38 × 2 P3 SPMR038Q 2.5P 165 52 - 76 30 23 26 4 7 △ M38 × 1.5 P3 SPMR038O 2.5P 165 26 - 76 30 23 26 4 8 △ M39 × 4 P4 SPMS039U 2.5P 165 52 - 76 30 23 26 4 7 △ M39 × 3 P3 SPMR039S 2.5P 165 52 - 76 30 23 26 4 7 △ Hand Taps M39 × 2 P3 SPMR039Q 2.5P 165 52 - 76 30 23 26 4 7 △ M39 × 1.5 P3 SPMR039O 2.5P 165 26 - 76 30 23 26 4 8 △ M40 × 3 P3 SPMR040S 2.5P 175 59 - 81 32 26 30 4 7 △ M40 × 2 P3 SPMR040Q 2.5P 175 59 - 81 32 26 30 4 7 △ Carbide Taps Cemented M40 × 1.5 P3 SPMR040O 2.5P 175 27 - 81 32 26 30 4 8 △ M42 × 4.5 P4 SPMS042V 2.5P 175 59 - 81 32 26 30 4 7 △ M42 × 3 P3 SPMR042S 2.5P 175 59 - 81 32 26 30 4 7 △ M42 × 2 P3 SPMR042Q 2.5P 175 59 - 81 32 26 30 4 7 △ Roll Taps M42 × 1.5 P3 SPMR042O 2.5P 175 27 - 81 32 26 30 4 8 △ M45 × 4.5 P4 SPMS045V 2.5P 180 59 - 83 35 26 30 4 7 △ M45 × 3 P3 SPMR045S 2.5P 180 59 - 83 35 26 30 4 7 △ M45 × 2 P3 SPMR045Q 2.5P 180 59 - 83 35 26 30 4 7 △ M45 × 1.5 P3 SPMR045O 2.5P 180 27 - 83 35 26 30 4 8 △ Simple Inspection Tools Special Thread Taps M48 × 5 P4 SPMS048W 2.5P 185 65 - 85 38 29 32 4 7 △ M48 × 4 P4 SPMS048U 2.5P 185 65 - 85 38 29 32 4 7 △ M48 × 3 P3 SPMR048S 2.5P 185 65 - 85 38 29 32 4 7 △ M48 × 2 P3 SPMR048Q 2.5P 185 65 - 85 38 29 32 4 7 △ Pipe Taps M48 × 1.5 P3 SPMR048O 2.5P 185 28 - 85 38 29 32 4 8 △ For Unified Threads Size Class Code Chamfer L ℓ ℓn ℓs Ds K ℓk No. of Type Stock (mm) (mm) (mm) (mm) (mm) (mm) (mm) flutes No.1-64UNC P1 SPPUN1D 2.5P 42 7.2 - 27 3 2.5 5 2 2 △ Thread Mills No.2-56UNC P1 SPPUN2E 2.5P 42 8.1 12 27 3 2.5 5 2 3 △ No.2-64UNF P1 SPPUN2D 2.5P 42 8.1 12 27 3 2.5 5 2 3 △ No.3-48UNC P1 SPPUN3F 2.5P 46 8.1 14 29 3 2.5 5 2 3 △ No.3-56UNF P1 SPPUN3E 2.5P 46 8.1 14 29 3 2.5 5 2 3 △ Dies No.4-40UNC P1 SPPUN4H 2.5P 46 9 14 26 4 3.2 6 2 3 ○ No.4-48UNF P1 SPPUN4F 2.5P 46 9 14 26 4 3.2 6 2 3 △ No.5-40UNC P1 SPPUN5H 2.5P 52 11 16 29 5 4 7 3 3 ○ No.5-44UNF P1 SPPUN5G 2.5P 52 11 16 29 5 4 7 3 3 △ Center Drills No.6-32UNC P2 SPQUN6J 2.5P 52 11 16 29 5 4 7 3 3 ○ No.6-40UNF P1 SPPUN6H 2.5P 52 11 16 29 5 4 7 3 3 △ No.8-32UNC P2 SPQUN8J 2.5P 60 13 21 33 5.5 4.5 7 3 3 ○ No.8-36UNF P2 SPQUN8I 2.5P 60 13 21 33 5.5 4.5 7 3 3 △ No.10-24UNC P2 SPQUNAM 2.5P 60 13 22 33 5.5 4.5 7 3 3 ○ Centering Tools No.10-32UNF P2 SPQUNAJ 2.5P 60 13 22 33 5.5 4.5 7 3 3 ○ No.12-24UNC P2 SPQUNCM 2.5P 62 15 26 33 6 4.5 7 3 3 △ No.12-28UNF P2 SPQUNCK 2.5P 62 15 26 33 6 4.5 7 3 3 △ JIS ◎=Standard ○=Semi standard △=Made to order SP-8 For improvement, spec may change without advance notice. 325