Nominal | Thread | Major | Pitch | TPI | Pitch | Minor | Tap |
Size | Form | Diameter | mm | Diameter | Diameter | Drill | |
BSF | Type | mm | p | mm | Male Thd. | Diameter | |
|
| d=D |
| d2=D2 | d3 | mm | |
3/16" | BSF | 4.763 | 0.794 | 32 | 4.255 | 3.747 | 4 |
7/32" | BSF | 5.556 | 0.907 | 28 | 4.975 | 4.394 | 4.6 |
1/4" | BSF | 6.35 | 0.977 | 26 | 5.725 | 5.1 | 5.3 |
9/32" | BSF | 7.142 | 0.977 | 26 | 6.518 | 5.893 | 6.1 |
5/16" | BSF | 7.938 | 1.156 | 22 | 7.199 | 6.459 | 6.8 |
3/8" | BSF | 9.525 | 1.27 | 20 | 8.712 | 7.899 | 8.3 |
7/16" | BSF | 11.113 | 1.411 | 18 | 10.209 | 9.304 | 9.7 |
1/2" | BSF | 12.7 | 1.588 | 16 | 11.684 | 10.668 | 11.1 |
9/16" | BSF | 14.288 | 1.588 | 16 | 13.272 | 12.256 | 12.7 |
5/8" | BSF | 15.875 | 1.814 | 14 | 14.712 | 13.549 | 14 |
11/16" | BSF | 17.463 | 1.814 | 14 | 16.3 | 15.137 | 15.5 |
3/4" | BSF | 19.05 | 2.117 | 12 | 17.693 | 16.336 | 16.75 |
13/16" | BSF | 20.638 | 2.117 | 12 | 19.281 | 17.924 | 18.25 |
7/8" | BSF | 22.225 | 2.309 | 11 | 20.747 | 19.269 | 19.75 |
1" | BSF | 25.4 | 2.54 | 10 | 23.774 | 22.148 | 22.75 |
1 1/8" | BSF | 28.575 | 2.822 | 9 | 26.769 | 24.963 | 26.5 |
1 1/4" | BSF | 31.75 | 2.822 | 9 | 29.944 | 28.138 | 28.75 |
1 3/8" | BSF | 34.925 | 3.175 | 8 | 32.893 | 30.861 | 31.5 |
1 1/2" | BSF | 38.1 | 3.175 | 8 | 36.068 | 34.036 | 34.5 |
1 5/8" | BSF | 41.275 | 3.175 | 8 | 39.243 | 37.211 | 38 |
1 3/4" | BSF | 44.45 | 3.629 | 7 | 42.126 | 39.802 | 40.5 |
2" | BSF | 50.8 | 3.629 | 7 | 48.476 | 46.152 | 47 |
2 1/4" | BSF | 57.15 | 4.234 | 6 | 54.44 | 51.73 | 53 |
2 1/2" | BSF | 63.5 | 4.234 | 6 | 60.79 | 58.08 | 59 |
2 3/4" | BSF | 69.85 | 4.234 | 6 | 67.14 | 64.43 | n/a |
3" | BSF | 76.2 | 5.08 | 5 | 72.946 | 69.692 | n/a |
3 1/4" | BSF | 82.55 | 5.08 | 5 | 79.296 | 76.042 | n/a |
3 1/2" | BSF | 88.9 | 5.645 | 4 1/2 | 85.285 | 81.67 | n/a |
3 3/4" | BSF | 95.25 | 5.645 | 4 1/2 | 91.635 | 88.02 | n/a |
4" | BSF | 101.6 | 5.645 | 4 1/2 | 97.985 | 94.37 | n/a |
4 1/4" | BSF | 107.95 | 6.35 | 4 | 103.886 | 99.822 | n/a |
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