
10. Tap Thread Limits (JIS, DIN, ANSI) Intro Unified Threads (UNC/UNF) Unit: mm Major Minor Major Minor Pitch Diameter Pitch Diameter Kind diameter diameter Kind diameter diameter Size of Class Upper Lower Tolerance Basic Size of Class Upper Lower Tolerance Basic SP tap Basic Basic Tolerance tap Basic Basic Tolerance Size Size (μm) + Tolerance Size Size (μm) + Tolerance (μm) + (μm) Size (μm) + (μm) Size P1 25 10 15 3BX 38 25 13 forming tap P2 40 25 15 2BX 64 51 13 cutting tap 3B 22 10 12 No.6-40UNF G5 3.505 3.094 64 51 13 2.817 SL 3.175 2.764 2.487 2B 35 16 19 H3 38.1 25.4 12.7 GH2 25.4 12.7 12.7 H5 63.5 50.8 12.7 GH3 38.1 25.4 12.7 P1 20 0 20 No.5-40UNC 3BX 38 25 13 P2 40 20 20 PO 2BX 51 38 13 P3 60 40 20 forming tap G4 51 38 13 3B 25 11 14 cutting tap 3.175 2.764 2.487 G5 64 51 13 2B 39 18 21 4.166 3.650 3.307 H3 38.1 25.4 12.7 2BX 59 38 21 ST H5 63.5 50.8 12.7 GH2 25.4 12.7 12.7 P1 25 10 15 GH3 38.1 25.4 12.7 P2 40 25 15 GH4 50.8 38.1 12.7 cutting tap No.8-32UNC 3B 21 9 12 GH5 63.5 50.8 12.7 2B 3.175 2.799 34 15 19 2.550 3BX 51 38 13 ROLL GH2 25.4 12.7 12.7 2BX 64 51 13 GH3 38.1 25.4 12.7 G5 64 51 13 forming tap No.5-44UNF 3BX 38 25 13 G6 76 64 12 2BX 51 38 13 G7 4.166 3.650 89 76 13 3.307 CARBIDE forming tap G4 51 38 13 G8 102 89 13 3.175 2.799 2.550 G5 64 51 13 H3 38.1 25.4 12.7 H3 38.1 25.4 12.7 H5 63.5 50.8 12.7 H5 63.5 50.8 12.7 P1 20 0 20 LONG P1 20 0 20 P2 40 20 20 P2 40 20 20 P3 60 40 20 cutting tap P3 60 40 20 3B 24 10 14 3B 25 11 14 2B 4.166 3.708 38 17 21 3.401 HAND cutting tap 2B 38 18 20 2BX 58 37 21 TAPS 3.505 2.990 2.647 2BX 58 38 20 GH2 25.4 12.7 12.7 No.8-36UNF GH2 25.4 12.7 12.7 GH3 38.1 25.4 12.7 GH3 38.1 25.4 12.7 GH4 50.8 38.1 12.7 EG (STI) No.6-32UNC GH4 50.8 38.1 12.7 3BX 51 38 13 forming tap GH5 63.5 50.8 12.7 2BX 64 51 13 3BX 51 38 13 G5 4.166 3.708 64 51 13 3.401 2BX 64 51 13 H3 38.1 25.4 12.7 SPECIAL THREADS, forming tap G5 64 51 13 H5 63.5 50.8 12.7 GAUGES G6 3.505 2.990 76 64 12 2.647 P1 20 0 20 G7 89 76 13 P2 40 20 20 H3 38.1 25.4 12.7 P3 60 40 20 THREAD H5 63.5 50.8 12.7 3B 27 13 14 MILLS cutting tap P1 25 10 15 2B 42 20 22 4.826 4.138 3.680 P2 40 25 15 2BX 62 40 22 P3 55 40 15 GH2 25.4 12.7 12.7 DIES cutting tap 3B 23 9 14 GH3 38.1 25.4 12.7 No.10-24UNC No.6-40UNF 2B 3.505 3.094 36 16 20 2.817 GH4 50.8 38.1 12.7 2BX 51 31 20 GH5 63.5 50.8 12.7 GH2 25.4 12.7 12.7 3BX 51 38 13 GH3 38.1 25.4 12.7 2BX 76 64 12 CENTER forming tap GH4 50.8 38.1 12.7 G6 76 64 12 DRILLS 4.826 4.138 3.680 G7 89 76 13 H4 50.8 38.1 12.7 H6 76.2 63.5 12.7 Technical info 675