9. Comparison of pitch diameter tolerance Intro For Cutting Tap Unified Coarse Thread (UNC) 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 P2 P3 P4 SL 3B 2BX 3B 1083/8-16 UNC 2B 2B 144 GH3 GH4 GH5 GH6 1B 215 PO P2 P3 P4 3B 2BX 3B 116 7/16-14 UNC 2B 2B 154 GH3 GH4 GH5 GH6 1B 233 ST P2 P3 P4 3B 2BX 3B 121 1/2-13 UNC 2B 2B 165 GH3 GH4 GH5 GH6 1B 246 ROLL P2 P3 P4 3B 2BX 3B 128 9/16-12 UNC 2B 2B 172 GH3 GH4 GH6 1B 258 CARBIDE P2 P3 P4 3B 2BX 3B 136 5/8-11 UNC 2B 2B 182 LONG GH3 GH4 GH5 GH6 GH7 1B 271 P2 P3 P4 3B 2BX 3B 144 HAND, 3/4-10 UNC 2B 2B 195 TAPS GH3 GH4 GH5 GH6 GH7 1B 292 P2 P3 P4 3B 2BX 3B 154 EG (STI) 7/8-9 UNC 2B 2B 207 GH3 GH4 GH5 GH6 GH7 1B 311 SPECIALTHREADS,GAUGES1-8 UNC P2 P33B P52BX 3B 167 2B 2B 223 GH3 GH4 GH5 GH7 GH8 1B 334 THREAD MILLS P3 P5 P4 1 1/8-7 UNC 3B 2BX 3B 180 2B 2B 238 DIES GH4 GH6 GH8 1B 358 P3 P5 P4 CENTER 1 1/4-7 UNC 3B 2BX 3B 182 DRILLS 2B 2B 243 GH4 GH6 GH8 1B 365 Technical info 652