Historic American National Standards Institute-American Bearing Manufacturers Association threads for bearings Have been since adapted within Unified Inch Screw Thread Form (ANSI/ASME B1.1) identified as ‘UNS’.
| Threads | Major Dia | Pitch Dia | Minor Dia | |||
|---|---|---|---|---|---|---|
| Thread Size | Per Inch | Max | Min | Max | Min | Max |
| .391 - 32 | 32 | 0.3910 | 0.3856 | 0.3707 | 0.3681 | 0.3527 |
| .469 - 32 | 32 | 0.4690 | 0.4636 | 0.4487 | 0.4461 | 0.4307 |
| .586 - 32 | 32 | 0.5860 | 0.5806 | 0.5657 | 0.5627 | 0.5477 |
| .664 - 32 | 32 | 0.6640 | 0.6586 | 0.6437 | 0.6407 | 0.6257 |
| .781 - 32 | 32 | 0.7810 | 0.7756 | 0.7607 | 0.7573 | 0.7427 |
| .969 - 32 | 32 | 0.9690 | 0.9636 | 0.9487 | 0.9453 | 0.9307 |
| 1.173 - 18 | 18 | 1.1730 | 1.1648 | 1.1369 | 1.1329 | 1.1048 |
| 1.312 - 18 | 18 | 1.3120 | 1.3038 | 1.2764 | 1.2724 | 1.2438 |
| 1.376 - 18 | 18 | 1.3760 | 1.3678 | 1.3399 | 1.3359 | 1.3078 |
| 1.563 - 18 | 18 | 1.5630 | 1.5548 | 1.5269 | 1.5224 | 1.4948 |
| 1.767 - 18 | 18 | 1.7670 | 1.7588 | 1.7309 | 1.7264 | 1.6988 |
| 1.967 - 18 | 18 | 1.9670 | 1.9588 | 1.9309 | 1.9264 | 1.8988 |
| 2.157 - 18 | 18 | 2.1570 | 2.1488 | 2.1209 | 2.1158 | 2.0888 |
| 2.204 - 18 | 18 | 2.2040 | 2.1958 | 2.1679 | 2.1628 | 2.1358 |
| 2.360 - 18 | 18 | 2.3600 | 2.3518 | 2.3239 | 2.3188 | 2.2918 |
| 2.407 - 18 | 18 | 2.4070 | 2.3988 | 2.3709 | 2.3658 | 2.3388 |
| 2.548 - 18 | 18 | 2.5480 | 2.5398 | 2.5119 | 2.5068 | 2.4798 |
| 2.626 - 18 | 18 | 2.6260 | 2.6178 | 2.5899 | 2.5848 | 2.5578 |
| 2.751 - 18 | 18 | 2.7510 | 2.7428 | 2.7149 | 2.7098 | 2.6828 |
| 2.933 - 12 | 12 | 2.9330 | 2.9218 | 2.8789 | 2.8735 | 2.8308 |
| 3.137 - 12 | 12 | 3.1370 | 3.1258 | 3.0829 | 3.0770 | 3.0348 |
| 3.340 - 12 | 12 | 3.3400 | 3.3288 | 3.2859 | 3.2800 | 3.2378 |
| 3.527 - 12 | 12 | 3.5270 | 3.5158 | 3.4729 | 3.4655 | 3.4248 |
| 3.730 - 12 | 12 | 3.7300 | 3.7188 | 3.6759 | 3.6685 | 3.6278 |
| 3.918 - 12 | 12 | 3.9180 | 3.9068 | 3.8639 | 3.8565 | 3.8158 |
| 4.122 - 12 | 12 | 4.1220 | 4.1108 | 4.0679 | 4.0596 | 4.0198 |
| 4.325 - 12 | 12 | 4.3250 | 4.3138 | 4.2709 | 4.2626 | 4.2228 |
| 4.716 - 12 | 12 | 4.7160 | 4.7048 | 4.6619 | 4.6536 | 4.6138 |
| 4.778 - 12 | 12 | 4.7780 | 4.7668 | 4.7239 | 4.7156 | 4.6758 |
| 5.106 - 12 | 12 | 5.1060 | 5.0948 | 5.0519 | 5.0436 | 5.0038 |
| 5.185 - 12 | 12 | 5.1850 | 5.1738 | 5.1309 | 5.1226 | 5.0828 |
| 5.497 - 12 | 12 | 5.4970 | 5.4858 | 5.4429 | 5.4346 | 5.3948 |
| 5.622 - 12 | 12 | 5.6220 | 5.6108 | 5.5679 | 5.5596 | 5.5198 |
| 5.888 - 12 | 12 | 5.8880 | 5.8768 | 5.8339 | 5.8256 | 5.7858 |
| 6.097 - 8 | 8 | 6.0970 | 6.0818 | 6.0158 | 6.0067 | 5.9436 |
| 6.284 - 8 | 8 | 6.2840 | 6.2688 | 6.2028 | 6.1937 | 6.1306 |
| 6.503 - 8 | 8 | 6.5030 | 6.4878 | 6.4218 | 6.4127 | 6.3496 |
| 6.659 - 8 | 8 | 6.6590 | 6.6438 | 6.5778 | 6.5687 | 6.5056 |
| 6.925 - 8 | 8 | 6.9250 | 6.9098 | 6.8438 | 6.8347 | 6.7716 |
| 7.066 - 8 | 8 | 7.0660 | 7.0508 | 6.9848 | 6.9757 | 6.9126 |
| 7.331 - 8 | 8 | 7.3310 | 7.3158 | 7.2498 | 7.2407 | 7.1776 |
| 7.472 - 8 | 8 | 7.4720 | 7.4568 | 7.3908 | 7.3817 | 7.3186 |
| 7.753 - 8 | 8 | 7.7530 | 7.7378 | 7.6718 | 7.6627 | 7.5996 |
| 7.847 - 8 | 8 | 7.8470 | 7.8318 | 7.7658 | 7.7544 | 7.6936 |
| 8.191 - 8 | 8 | 8.1910 | 8.1758 | 8.1098 | 8.0977 | 8.0376 |
| 8.628 - 8 | 8 | 8.6280 | 8.6128 | 8.5468 | 8.5347 | 8.4746 |
| 9.442 - 6 | 6 | 9.4420 | 9.4218 | 9.3337 | 9.3213 | 9.2375 |
| 10.192 - 6 | 6 | 10.1920 | 10.1718 | 10.0837 | 10.0707 | 9.9875 |
| 11.004 - 6 | 6 | 11.0040 | 10.9838 | 10.8957 | 10.8827 | 10.7995 |
| 11.785 - 6 | 6 | 11.7850 | 11.7648 | 11.6767 | 11.6637 | 11.5805 |
| 11.973 - 6 | 6 | 11.9730 | 11.9528 | 11.8647 | 11.8517 | 11.7685 |
| 12.562 - 6 | 6 | 12.5620 | 12.5418 | 12.4537 | 12.4402 | 12.3575 |
| 12.942 - 6 | 6 | 12.9420 | 12.9218 | 12.8337 | 12.8202 | 12.7375 |
| 13.723 - 6 | 6 | 13.7230 | 13.7028 | 13.6147 | 13.6012 | 13.5185 |
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