
Unified Threads (UNC/UNF) Unit: mm
| SP Si | Kind f Cl | Major diameter Pitch Di | amete | r Minor diameter | Si | Kind f Cl | Major diameter Pitch | Dia | mete | r | Minor diameter |
| ze | o tap ass | Basic Basic Upper Tolerance | Lower Toleranc | e Tolerance Basic | ze | o tap ass | Basic Basic Upper Toleran | ce L Tol | ower eranc | e Tolerance | Basic |
| Size Size (μm) + | (μm) + | (μm) Size | Size Size (μm) + | ( | 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 | |||
| tap 3B | 25 | 11 | 14 | tap 3B | 30 | 14 | 16 | ||||
| ting 2B | 4.826 4.310 40 | 18 | 3.967 22 | 1/4-20UNC | ting 2B | 6.350 5.524 46 | 22 | 24 | 4.976 | ||
| cut 2BX | 60 | 38 | 22 | cut 2BX | 71 | 47 | 24 | ||||
| PO | GH2 | 25.4 | 12.7 | 12.7 | GH2 | 25.4 | 1 | 2.7 | 12.7 | ||
| No10-32UNF | GH3 | 38.1 | 25.4 | 12.7 | GH3 | 38.1 | 2 | 5.4 | 12.7 | ||
| . | GH4 | 50.8 | 38.1 | 12.7 | GH5 | 63.5 | 5 | 0.8 | 12.7 | ||
| 3BX | 51 | 38 | 13 | 3BX | 64 | 51 | 13 | ||||
| ST | 2BX | 64 | 51 | 13 | ap 2BX | 76 | 64 | 12 | |||
| tap G5 | 64 | 51 | 13 | 1/4-20UNC | ng t G6 | 6350 5524 76 | 64 | 12 | 4976 | ||
| ming G6 | 4.826 4.310 76 | 64 | 3.967 12 | rmi G7 | . . 89 | 76 | 13 | . | |||
| for G7 | 89 | 76 | 13 | fo H4 | 50.8 | 3 | 8.1 | 12.7 | |||
| H4 | 508 | 381 | 127 | H6 | 762 | 35 | 127 | ||||
| ROLL | . | . | . | . | . | . | |||||
| H6 | 76.2 | 63.5 | 12.7 | P1 | 20 | 0 | 20 | ||||
| P1 | 20 | 0 | 20 | P2 | 40 | 20 | 20 | ||||
| P2 | 40 | 20 | 20 | P3 | 60 | 40 | 20 | ||||
| P3 | 60 | 40 | 20 | p 3B | 27 | 11 | 16 | ||||
| CARBIDE | p 3B | 28 | 12 | 16 | g ta 2B | 43 | 19 | 24 | |||
| ta | in | 6.350 5.761 | 5.367 | ||||||||
| g 2B | 43 | 20 | 23 | utt 2BX | 63 | 39 | 24 | ||||
| uttin 2BX | 5.486 4.798 63 | 40 | 4.341 23 | c GH2 | 25.4 | 1 | 2.7 | 12.7 | |||
| c GH2 | 25.4 | 12.7 | 12.7 | GH3 | 38.1 | 2 | 5.4 | 12.7 | |||
| LONG | 1/4-28UNF | ||||||||||
| No.12-24UNC | GH3 | 38.1 | 25.4 | 12.7 | GH4 | 50.8 | 8.1 | 12.7 | |||
| GH4 | 50.8 | 38.1 | 12.7 | GH5 | 63.5 | 5 | 0.8 | 12.7 | |||
| GH5 | 63.5 | 50.8 | 12.7 | 3BX | 51 | 38 | 13 | ||||
| HAND | p 3BX | 51 | 38 | 13 | tap 2BX | 76 | 64 | 12 | |||
| ta 2BX | 76 | 64 | 12 | g G6 | 76 | 64 | 12 | ||||
| TAPS | ing G6 | 5.486 4.798 76 | 64 | 4.341 12 | min G7 | 6.350 5.761 89 | 76 | 13 | 5.367 | ||
| form H4 | 50.8 | 38.1 | 12.7 | for H4 | 50.8 | 3 | 8.1 | 12.7 | |||
| H6 | 76.2 | 63.5 | 12.7 | H6 | 76.2 | 6 | 3.5 | 12.7 | |||
| EG (STI) | P1 | 20 | 0 | 20 | P2 | 40 | 20 | 20 | |||
| P2 | 40 | 20 | 20 | P3 | 60 | 40 | 20 | ||||
| P3 | 60 | 40 | 20 | p 3B | 32 | 14 | 18 | ||||
| SPECIAL | ap 3B | 27 | 11 | 16 | ng ta 2B | 7.938 7.021 49 | 23 | 26 | 6.411 | ||
| g t 2B | 42 | 19 | 23 | tti 2BX | 74 | 48 | 26 | ||||
| THREADS, | ttin 2BX | 5.486 4.897 62 | 39 | 4.503 23 | cu GH2 | 25.4 | 1 | 2.7 | 12.7 | ||
| GAUGES | cu GH2 | 25.4 | 12.7 | 12.7 | 5/16-18UNC | GH3 | 38.1 | 2 | 5.4 | 12.7 | |
| No.12-28UNF | GH3 | 38.1 | 25.4 | 12.7 | GH5 | 63.5 | 5 | 0.8 | 12.7 | ||
| THREAD | GH4 | 50.8 | 38.1 | 12.7 | 3BX | 64 | 51 | 13 | |||
| MILLS | GH5 | 63.5 | 50.8 | 12.7 | ap 2BX | 89 | 76 | 13 | |||
| 3BX | 51 | 38 | 13 | ng t G7 | 7.938 7.021 89 | 76 | 13 | 6.411 | |||
| tap 2BX | 76 | 64 | 12 | formi H5 | 63.5 | 5 | 0.8 | 12.7 | |||
| ming G6 | 5.486 4.897 76 | 64 | 4.503 12 | H7 | 88.9 | 7 | 6.2 | 12.7 | |||
| DIES | or H4 | 50.8 | 38.1 | 12.7 | |||||||
| f H6 | 76.2 | 63.5 | 12.7 |