
Unified Threads (UNC/UNF) Unit: mm
| Kind Major diameter | Pitch Di | amete | r Minor diameter | Kind | Major diamete | r Pitch | Diam | ete | r Minor diameter | |||
| SP Size | of tap Class Basic | Basic Upper Tolerance | Lower Toleranc | Tolerance Basic | Size | of tap | Class | Basic | Basic Upper Toleran | e Lo Tol | wer ranc | Tolerance Basic |
| Size | Size (μm) + | (μm) + | (μm) Size | Size | Size (μm) + | (μ | m) + | (μm) Size | ||||
| P1 | 20 | 0 | 20 | P1 | 20 | 0 | 20 | |||||
| P2 | 40 | 20 | 20 | P2 | 40 | 20 | 20 | |||||
| SL | P3 | 60 | 40 | 20 | P3 | 60 | 40 | 20 | ||||
| P4 | 80 | 60 | 20 | P4 | 80 | 60 | 20 | |||||
| tap 3B 2B | 32 52 | 12 22 | 20 30 | tap | 3B 2B | 34 56 | 12 3 | 22 33 | ||||
| ng 12700 | 11874 | 11326 | 5/8-18UNF | ng | 1587 | 5 14958 | 14348 | |||||
| PO | tti . 2BX | . 77 | 47 | . 30 | tti | 2BX | . | . 81 | 48 | . 33 | ||
| cu GH2 | 25.4 | 12.7 | 12.7 | cu | GH2 | 25.4 | 1 | 2.7 | 12.7 | |||
| 1/2-20UNF | GH3 | 38.1 | 25.4 | 12.7 | GH3 | 38.1 | 2 | 5.4 | 12.7 | |||
| GH4 | 50.8 | 38.1 | 12.7 | GH4 | 50.8 | 3 | 8.1 | 12.7 | ||||
| ST | GH5 | 63.5 | 50.8 | 12.7 | GH5 | 63.5 | 5 | 0.8 | 12.7 | |||
| GH6 | 76.2 | 63.5 | 12.7 | GH6 | 76.2 | 6 | 3.5 | 12.7 | ||||
| 3BX | 76 | 64 | 12 | P2 | 40 | 20 | 20 | |||||
| g tap 2BX | 89 | 76 | 13 | P3 | 60 | 40 | 20 | |||||
| R | in 12.700 G7 | 11.874 89 | 76 | 11.326 13 | P4 | 80 | 60 | 20 | ||||
| OLL | form H5 | 63.5 | 50.8 | 12.7 | 3B | 43 | 19 | 24 | ||||
| H7 | 88.9 | 76.2 | 12.7 | tap | 2B | 66 | 31 | 35 | ||||
| P2 | 40 | 20 | 20 | 3/4-10UNC | ing | 2BX | 19.05 | 0 17.399 91 | 56 | 16.299 35 | ||
| P3 | 60 | 40 | 20 | cutt | GH3 | 38.1 | 2 | 5.4 | 12.7 | |||
| CARBIDE | P4 | 80 | 60 | 20 | GH4 | 508 | 3 | 81 | 127 | |||
| ap 3B | 39 | 19 | 20 | GH5 | . 63.5 | 5 | . 0.8 | . 12.7 | ||||
| 9/16-12UNC | ing t 14.288 2B | 12.913 60 | 29 | 11.996 31 | GH6 | 76.2 | 6 | 3.5 | 12.7 | |||
| cutt 2BX | 85 | 54 | 31 | GH7 | 88.9 | 7 | 6.2 | 12.7 | ||||
| LONG | GH3 | 38.1 | 25.4 | 12.7 | P2 | 40 | 20 | 20 | ||||
| GH4 | 50.8 | 38.1 | 12.7 | P3 | 60 | 40 | 20 | |||||
| GH6 | 76.2 | 63.5 | 12.7 | P4 | 80 | 60 | 20 | |||||
| HAND | P1 | 20 | 0 | 20 | ap | 3B | 35 | 13 | 22 | |||
| P2 | 40 | 20 | 20 | g t | 2B | 60 | 25 | 35 | ||||
| TAPS | P3 | 60 | 40 | 20 | 3/4-16UNF | ttin | 2BX | 19.05 | 0 18.019 85 | 50 | 17.330 35 | |
| P4 | 80 | 60 | 20 | cu | GH3 | 38.1 | 2 | 5.4 | 12.7 | |||
| ap 3B | 33 | 13 | 20 | GH4 | 50.8 | 3 | 8.1 | 12.7 | ||||
| EG (STI) | g t 2B | 55 | 23 | 32 | GH5 | 63.5 | 5 | 0.8 | 12.7 | |||
| 9/16-18UNF | uttin 14.288 2BX | 13.371 80 | 48 | 12.761 32 | GH6 | 76.2 | 6 | 3.5 | 12.7 | |||
| c GH2 | 25.4 | 12.7 | 12.7 | P2 | 40 | 20 | 20 | |||||
| GH3 | 38.1 | 25.4 | 12.7 | P3 | 60 | 40 | 20 | |||||
| SPECIAL | GH4 | 50.8 | 38.1 | 12.7 | P4 | 80 | 60 | 20 | ||||
| THREADS, GAUGES | GH5 | 63.5 | 50.8 | 12.7 | 3B | 45 | 21 | 24 | ||||
| GH6 | 76.2 | 63.5 | 12.7 | tap | 2B | 70 | 33 | 37 | ||||
| P2 | 40 | 20 | 20 | 7/8-9UNC | ing | 2BX | 22.22 | 5 20.391 95 | 58 | 19.169 37 | ||
| THREAD | P3 | 60 | 40 | 20 | cutt | GH3 | 38.1 | 2 | 5.4 | 12.7 | ||
| P4 | 80 | 60 | 20 | GH4 | 508 | 3 | 81 | 127 | ||||
| MILLS | p 3B | 41 | 19 | 22 | GH5 | . 63.5 | 5 | . 0.8 | . 12.7 | |||
| ta 2B | 63 | 30 | 33 | GH6 | 76.2 | 6 | 3.5 | 12.7 | ||||
| 5/8-11UNC | ting 15.875 2BX | 14.376 88 | 55 | 13.376 33 | GH7 | 88.9 | 7 | 6.2 | 12.7 | |||
| DIES | ut GH3 | 38.1 | 25.4 | 12.7 | P2 | 40 | 20 | 20 | ||||
| c GH4 | 50.8 | 38.1 | 12.7 | P3 | 60 | 40 | 20 | |||||
| GH5 | 63.5 | 50.8 | 12.7 | P4 | 80 | 60 | 20 | |||||
| GH6 | 762 | 635 | 127 | 3B | 39 | 15 | 24 | |||||
| CENTER | GH7 | . 88.9 | . 76.2 | . 12.7 | ap | 2B | 64 | 27 | 37 | |||
| DRILLS | g t | |||||||||||
| 7/8-14UNF | in | 2BX | 22.22 | 5 21.046 89 | 52 | 20.262 37 | ||||||
| utt | GH3 | 381 | 2 | 54 | 127 | |||||||
| c | GH4 | . 50.8 | 3 | . 8.1 | . 12.7 | |||||||
| Technical if | GH5 | 63.5 | 5 | 0.8 | 12.7 | |||||||
| no | GH6 GH7 | 76.2 88.9 | 6 7 | 3.5 6.2 | 12.7 12.7 |