Общий каталог Yamawa 2021 - страница 682
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12. Recommended drill sizes for tapping internal UN and UNJ threads
SP
SL
PO
| Minor d | UN iameter | C/UNF (ANSI B | 1.1) | Minor d | UNJC/ iameter | UNJF (SAE AS | 8879D) | ||||||
| Size | D Max. | 1 Min. | Drill size | GH tap clas 2B thread | s suitable for tolerance | D Max. | 1 Min. | Drill size | GH tap clas 3B thread | s suitable for tolerance | ST | ||
| No. 2 | - 56 | UNC/UNJC | 1.871 | 1.695 | 1.80 | GH2 | 1.859 | 1.743 | 1.81 | GH1 | GH2 | ||
| No. 2 | - 64 | UNF/UNJF | 1.912 | 1.756 | 1.85 | GH2 | 1.902 | 1.799 | 1.86 | GH1 | GH2 | ||
| No. 3 | - 48 | UNC/UNJC | 2.146 | 1.941 | 2.10 | GH2 | 2.136 | 1.999 | 2.10 | GH1 | GH2 | ROLL | |
| No. 3 | - 56 | UNF/UNJF | 2.197 | 2.025 | 2.10 | GH2 | 2.189 | 2.073 | 2.10 | GH1 | GH2 | ||
| No. 4 | - 40 | UNC/UNJC | 2.385 | 2.157 | 2.30 | GH2 | GH3 | 2.392 | 2.228 | 2.30 | GH1 | GH2 | |
| No. 4 | - 48 | UNF/UNJF | 2.458 | 2.271 | 2.40 | GH2 | 2.466 | 2.330 | 2.40 | GH1 | GH2 | ||
| No. 5 | - 40 | UNC/UNJC | 2.697 | 2.487 | 2.60 | GH2 | 2.722 | 2.558 | 2.60 | GH1 | GH2 | ||
| No. 5 | - 44 | UNF/UNJF | 2.740 | 2.551 | 2.70 | GH2 | 2.763 | 2.614 | 2.70 | GH1 | GH2 | CARBIDE | |
| No. 6 | - 32 | UNC/UNJC | 2.895 | 2.642 | 2.80 | GH3 | GH4 | 2.938 | 2.734 | 2.85 | GH2 | GH3 | |
| No. 6 | - 40 | UNF/UNJF | 3.022 | 2.820 | 2.90 | GH2 | 3.053 | 2.888 | 3.00 | GH1 | GH2 | ||
| No. 8 | - 32 | UNC/UNJC | 3.530 | 3.302 | 3.40 | GH3 | GH4 | 3.599 | 3.394 | 3.50 | GH2 | GH3 | |
| No. 8 | - 36 | UNF/UNJF | 3.606 | 3.404 | 3.50 | GH3 | 3.662 | 3.480 | 3.60 | GH2 | GH3 | LONG | |
| No. 10 | - 24 | UNC/UNJC | 3.962 | 3.683 | 3.90 | GH3 | GH5 | 4.064 | 3.795 | 4.00 | GH2 | GH3 | |
| No. 10 | - 32 | UNF/UNJF | 4.165 | 3.963 | 4.10 | GH3 | GH4 | 4.254 | 4.054 | 4.20 | GH2 | GH3 | |
| No. 12 | - 24 | UNC/UNJC | 4.597 | 4.344 | 4.50 | GH3 | 4.704 | 4.456 | 4.60 | GH2 | GH3 | ||
| No. 12 | - 28 | UNF/UNJF | 4.724 | 4.496 | 4.60 | GH3 | 4.815 | 4.603 | 4.70 | GH2 | GH3 | HAND | |
| 1/4 | - 20 | UNC/UNJC | 5.257 | 4.979 | 5.10 | GH3 | GH5 | 5.387 | 5.114 | 5.30 | GH2 | GH3 | TAPS |
| 1/4 | - 28 | UNF/UNJF | 5.588 | 5.360 | 5.50 | GH3 | GH4 | 5.661 | 5.467 | 5.60 | GH2 | GH3 | |
| 5/16 | - 18 | UNC/UNJC | 6.731 | 6.401 | 6.60 | GH3 | GH5 | 6.832 | 6.564 | 6.70 | GH2 | GH3 | |
| 5/16 | - 24 | UNF/UNJF | 7.035 | 6.782 | 6.90 | GH3 | GH4 | 7.109 | 6.907 | 7.00 | GH2 | GH3 | EG (STI) |
| 3/8 | - 16 | UNC/UNJC | 8.153 | 7.798 | 8.00 | GH3 | GH5 | 8.255 | 7.979 | 8.10 | GH3 | ||
| 3/8 | - 24 | UNF/UNJF | 8.636 | 8.382 | 8.50 | GH3 | GH5 | 8.679 | 8.494 | 8.60 | GH2 | GH3 | |
| 7/16 | - 14 | UNC/UNJC | 9.550 | 9.144 | 9.40 | GH4 | GH5 | 9.639 | 9.348 | 9.50 | GH3 | ||
| 7/16 | - 20 | UNF/UNJF | 10.033 | 9.729 | 9.90 | GH3 | GH4 | 10.083 | 9.876 | 10.00 | GH2 | GH3 | SPECIAL |
| 1/2 | - 13 | UNC/UNJC | 11.023 | 10.592 | 10.90 | GH4 | GH5 | 11.094 | 10.798 | 11.00 | GH3 | THREADS, GAUGES | |
| 1/2 | - 20 | UNF/UNJF | 11.607 | 11.329 | 11.50 | GH3 | GH4 | 11.661 | 11.464 | 11.60 | GH3 | ||
| 9/16 | - 12 | UNC/UNJC | 12.446 | 11.989 | 12.20 | GH4 | 12.481 | 12.228 | 12.40 | GH3 | |||
| 9/16 | - 18 | UNF/UNJF | 13.081 | 12.751 | 12.90 | GH4 | 13.121 | 12.914 | 13.00 | GH3 | THREAD | ||
| 5/8 | - 11 | UNC/UNJC | 13.868 | 13.386 | 13.60 | GH4 | GH5 | 13.903 | 13.628 | 13.80 | GH3 | MILLS | |
| 5/8 | - 18 | UNF/UNJF | 14.681 | 14.351 | 14.50 | GH4 | GH5 | 14.701 | 14.501 | 14.60 | GH3 | ||
| 3/4 | - 10 | UNC/UNJC | 16.840 | 16.307 | 16.60 | GH4 | GH5 | 16.880 | 16.577 | 16.70 | GH3 | ||
| 3/4 | - 16 | UNF/UNJF | 17.678 | 17.323 | 17.50 | GH4 | GH5 | 17.721 | 17.506 | 17.60 | GH3 |
* The most suitable GH tap class to cut accurate 2B, 3B (UNJ) and 2B oversized internal threads tolerance, depends on application conditions and work-piece materials. Yamawa GH class system off ers a wide range of alternative tap classes allowing each customer to select the most suitable one according to application requirement.