| Size | Major Dia | Threads Per Inch | Pitch Dia | Minor Dia Externala | Minor Dia Internalb | Minor Dia Area | Tensile Stress Area |
| # | inch | tpi | inch | inch | inch | sq. inch | sq. inch |
| #0 | 0.06 | 80 | 0.0519 | 0.0451 | 0.0465 | 0.00151 | 0.0018 |
| #1* | 0.073 | 72 | 0.064 | 0.0565 | 0.058 | 0.00237 | 0.00278 |
| #2 | 0.086 | 64 | 0.0759 | 0.0674 | 0.0691 | 0.00339 | 0.00394 |
| #3* | 0.099 | 56 | 0.0874 | 0.0778 | 0.0797 | 0.00451 | 0.00523 |
| #4 | 0.112 | 48 | 0.0985 | 0.0871 | 0.0894 | 0.00566 | 0.00661 |
| #5 | 0.125 | 44 | 0.1102 | 0.0979 | 0.1004 | 0.00716 | 0.0083 |
| #6 | 0.138 | 40 | 0.1218 | 0.1082 | 0.1109 | 0.00874 | 0.01015 |
| #8 | 0.164 | 36 | 0.146 | 0.1309 | 0.1339 | 0.01285 | 0.01474 |
| #10 | 0.19 | 32 | 0.1697 | 0.1528 | 0.1562 | 0.0175 | 0.02 |
| #12* | 0.216 | 28 | 0.1928 | 0.1734 | 0.1773 | 0.0226 | 0.0258 |
| 1/4 | 0.25 | 28 | 0.2268 | 0.2074 | 0.2113 | 0.0326 | 0.0364 |
| 5/16 | 0.3125 | 24 | 0.2854 | 0.2629 | 0.2674 | 0.0524 | 0.058 |
| 3/8 | 0.375 | 24 | 0.3479 | 0.3254 | 0.3299 | 0.0809 | 0.0878 |
| 7/16 | 0.4375 | 20 | 0.405 | 0.378 | 0.3834 | 0.109 | 0.1187 |
| 1/2 | 0.5 | 20 | 0.4675 | 0.4405 | 0.4459 | 0.1486 | 0.1599 |
| 9/16 | 0.5625 | 18 | 0.5264 | 0.4964 | 0.5024 | 0.189 | 0.203 |
| 5/8 | 0.625 | 18 | 0.5889 | 0.5589 | 0.5649 | 0.24 | 0.256 |
| 3/4 | 0.75 | 16 | 0.7094 | 0.6763 | 0.6823 | 0.351 | 0.373 |
| 7/8 | 0.875 | 14 | 0.8286 | 0.79 | 0.7977 | 0.48 | 0.509 |
| 1 | 1 | 12 | 0.9459 | 0.9001 | 0.9098 | 0.625 | 0.663 |
| 1-1/8 | 1.125 | 12 | 1.0709 | 1.0258 | 1.0348 | 0.812 | 0.856 |
| 1¼ | 1.25 | 12 | 1.1959 | 1.1508 | 1.1598 | 1.024 | 1.073 |
| 1-3/8 | 1.375 | 12 | 1.3209 | 1.2758 | 1.2848 | 1.26 | 1.315 |
| 1½ | 1.5 | 12 | 1.4459 | 1.4008 | 1.4098 | 1.521 | 1.581 |
| # | inch | tpi | inch | inch | inch | sq. inch | sq. inch |
| Size | Major Dia | Threads Per Inch | Pitch Dia | Minor Dia External a | Minor Dia Internalb | Minor Dia Area | Tensile Stress Area |
| * Secondary Size | aForm for UNR thread | bBasic Minor Diameter | |||||
| Design Home | |
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Screw Threads |
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Thread System |
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Unified Screw Threads |
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UNC Coarse |
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UNF Fine |
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UNEF Extra Fine |
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Unified Standard Series |
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Tap Drill |
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Constant Pitch Series |
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Metric Screw Threads |
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Torque in Bolts |
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Introduction |
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Torque Calculator |
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Resources |
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Bibliography |
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