| 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 |
| #12* (0.216) | 0.2160 | 32 | 0.1957 | 0.1788 | 0.1822 | 0.0242 | 0.0270 |
| 1/4 | 0.2500 | 32 | 0.2297 | 0.2128 | 0.2162 | 0.0344 | 0.0379 |
| 5/16 | 0.3125 | 32 | 0.2922 | 0.2753 | 0.2787 | 0.0581 | 0.0625 |
| 3/8 | 0.3750 | 32 | 0.3547 | 0.3378 | 0.3412 | 0.0878 | 0.0932 |
| 7/16 | 0.4375 | 28 | 0.4143 | 0.3949 | 0.3988 | 0.1201 | 0.1274 |
| 1/2 | 0.5000 | 28 | 0.4768 | 0.4574 | 0.4613 | 0.1620 | 0.1700 |
| 9/16 | 0.5625 | 24 | 0.5354 | 0.5129 | 0.5174 | 0.2030 | 0.2140 |
| 5/8 | 0.6250 | 24 | 0.5979 | 0.5754 | 0.5799 | 0.2560 | 0.2680 |
| 11/16* | 0.6875 | 24 | 0.6604 | 0.6379 | 0.6424 | 0.3150 | 0.3290 |
| 3/4 | 0.7500 | 20 | 0.7175 | 0.6905 | 0.6959 | 0.3690 | 0.3860 |
| 13/16* | 0.8125 | 20 | 0.7800 | 0.7530 | 0.7584 | 0.4390 | 0.4580 |
| 7/8 | 0.8750 | 20 | 0.8425 | 0.8155 | 0.8209 | 0.5150 | 0.5360 |
| 15/16* | 0.9375 | 20 | 0.9050 | 0.8780 | 0.8834 | 0.5980 | 0.6200 |
| 1 | 1.0000 | 20 | 0.9675 | 0.9405 | 0.9459 | 0.6870 | 0.7110 |
| 11/16* | 1.0625 | 18 | 1.0264 | 0.9964 | 1.0024 | 0.7700 | 0.7990 |
| 11/8 | 1.1250 | 18 | 1.0889 | 1.0589 | 1.0649 | 0.8710 | 0.9010 |
| 13/16* | 1.1875 | 18 | 1.1514 | 1.1214 | 1.1274 | 0.9770 | 1.0090 |
| 11/4 | 1.2500 | 18 | 1.2139 | 1.1839 | 1.1899 | 1.0900 | 1.1230 |
| 15/16* | 1.3125 | 18 | 1.2764 | 1.2464 | 1.2524 | 1.2080 | 1.2440 |
| 13/8 | 1.3750 | 18 | 1.3389 | 1.3089 | 1.3149 | 1.3330 | 1.3700 |
| 17/16* | 1.4375 | 18 | 1.4014 | 1.3714 | 1.3774 | 1.4640 | 1.5030 |
| 11/2 | 1.5000 | 18 | 1.4639 | 1.4339 | 1.4399 | 1.6000 | 1.6400 |
| 19/16* | 1.5625 | 18 | 1.5264 | 1.4964 | 1.5024 | 1.7400 | 1.7900 |
| 15/8 | 1.6250 | 18 | 1.5889 | 1.5589 | 1.5649 | 1.8900 | 1.9400 |
| 111/16* | 1.6875 | 18 | 1.6514 | 1.6214 | 1.6274 | 2.0500 | 2.1000 |
| # | 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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