9. Comparison of pitch diameter tolerance Intro For Cutting Tap Unified Fine Thread (UNF) SP Basic Pitch (+) μm Dia. 0 20 40 60 80 100 120 140 160 180 200 220 240 260 280 300 320 340 360 380 400 420 P1 SL 3B 3B 42No.0-80 UNF 2B 2B 57 GH1 GH2 PO P1 3B 2BX 3B 3B 47 No.1-72 UNF 2B 2B 63 2B GH1 GH2 Internal threads 3B Internal threads 2B ST P1 Internal threads 1B 3B 3B 50 No.2-64 UNF 2B 2B 68 GH1 GH2 ROLL P1 3B 3B 53 No.3-56 UNF 2B 2B 71 GH1 GH2 CARBIDE P1 3B 3B 58 No.4-48 UNF 2B 2B 78 LONG GH1 GH2 P1 P2 3B 3B 60 HAND, No.5-44 UNF 2B 2B 80 TAPS GH2 GH3 P1 P2 P3 3B 2BX 3B 63 EG (STI) No.6-40 UNF 2B 2B 86 GH2 GH3 GH4 SPECIALTHREADS,No.8-36 UNF P1 P23B P32BX 3B 67 GAUGES 2B 2B 90 GH2 GH3 GH4 THREAD P1 P2 P3 MILLS 3BNo.10-32 UNF2BX 3B 73 2B 2B 98 GH2 GH3 GH4 DIES P1 P2 P3 3B 2BX 3B 77 No.12-28 UNF 2B 2B 105 GH2 GH3 GH4 GH5 CENTER DRILLS P1 P2 P3 3B 2BX 3B 81 1/4-28 UNF 2B 2B 108 GH2 GH3 GH4 GH5 1B 164 Technical info 654