TIPOS DE ROSCAS MáS COMUNES
| Rosca Ordinaria - UNC | Rosca Fina - UNF | 8UN | |||||||||
| Diámetro nominal y paso (in.) | Dia. Básico de rosca | Sección al Dia. Mínimo | Área de esfuerzo | Diámetro nominal y paso | Dia. Básico de rosca | Sección al Dia. Mínimo | Área de esfuerzo | Diámetro nominal y paso | Dia. Básico de rosca | Sección al Dia. Mínimo | Área de esfuerzo |
| In. | Sq in. | Sq in. | In. | Sq in. | Sq in. | In. | Sq in. | Sq in. | |||
| -- -- | -- | -- | -- | 0 - 80 | 0.0519 | 0.00151 | 0.0018 | -- -- | -- | -- | -- |
| 1 - 64 | 0.0629 | 0.00218 | 0.00263 | 1 - 72 | 0.064 | 0.00237 | 0.00278 | ||||
| 2 - 56 | 0.0744 | 0.0031 | 0.0037 | 2 - 64 | 0.0759 | 0.00339 | 0.00394 | ||||
| 3 - 48 | 0.0855 | 0.00406 | 0.00487 | 3 - 56 | 0.0874 | 0.00451 | 0.00523 | ||||
| 4 - 40 | 0.0958 | 0.00496 | 0.00604 | 4 - 48 | 0.0985 | 0.00566 | 0.00661 | -- -- | -- | -- | -- |
| 5 -40 | 0.1088 | 0.00672 | 0.00796 | 5 - 44 | 0.1102 | 0.00716 | 0.0083 | ||||
| 6 - 32 | 0.1177 | 0.00745 | 0.00909 | 6 - 40 | 0.1218 | 0.00874 | 0.01015 | ||||
| 8 - 32 | 0.1437 | 0.01196 | 0.014 | 8 - 36 | 0.146 | 0.01285 | 0.01474 | ||||
| 10 - 24 | 0.1629 | 0.0145 | 0.0175 | 10 - 32 | 0.1697 | 0.0175 | 0.02 | -- -- | -- | -- | -- |
| 12 - 24 | 0.1889 | 0.0206 | 0.0242 | 12 -28 | 0.1928 | 0.0226 | 0.0258 | -- -- | -- | -- | -- |
| 1/4 - 20 | 0.2175 | 0.0269 | 0.0318 | 1/4 - 28 | 0.2268 | 0.0326 | 0.0364 | -- -- | -- | -- | -- |
| 5/16 - 18 | 0.2764 | 0.0454 | 0.0524 | 5/16 - 24 | 0.2854 | 0.0524 | 0.058 | -- -- | -- | -- | -- |
| 3/8 - 16 | 0.3344 | 0.0678 | 0.0775 | 3/8 - 24 | 0.3479 | 0.0809 | 0.0878 | -- -- | -- | -- | -- |
| 7/16 - 14 | 0.3911 | 0.0933 | 0.1063 | 7/16 - 20 | 0.405 | 0.109 | 0.1187 | -- -- | -- | -- | -- |
| 1/2 - 13 | 0.45 | 0.1257 | 0.1419 | 1/2 - 20 | 0.4675 | 0.1486 | 0.1599 | -- -- | -- | -- | -- |
| 9/16 - 12 | 0.5084 | 0.162 | 0.182 | 9/16 - 18 | 0.5264 | 0.189 | 0.203 | -- -- | -- | -- | -- |
| 5/8 - 11 | 0.566 | 0.202 | 0.226 | 5/8 - 18 | 0.5889 | 0.24 | 0.256 | -- -- | -- | -- | -- |
| 3/4 - 10 | 0.685 | 0.302 | 0.334 | 3/4 - 16 | 0.7094 | 0.351 | 0.373 | -- -- | -- | -- | -- |
| 7/8 - 9 | 0.8028 | 0.419 | 0.462 | 7/8 - 14 | 0.8286 | 0.18 | 0.509 | -- -- | -- | -- | -- |
| 1 - 8 | 0.9188 | 0.551 | 0.606 | 1 - 12 | 0.9459 | 0.625 | 0.663 | 1 - 8 | 0.9188 | 0.551 | 0.606 |
| 1-1/8 - 7 | 1.0322 | 0.693 | 0.763 | 1-1/8 - 12 | 1.0709 | 0.812 | 0.856 | 1-1/8 - 8 | 1.0438 | 0.728 | 0.79 |
| 1-1/4 - 7 | 1.1572 | 0.89 | 0.969 | 1-1/4 - 12 | 1.1959 | 1.024 | 1.073 | 1-1/4 - 8 | 1.1688 | 0.929 | 1 |
| 1-3/8 - 6 | 1.2667 | 1.054 | 1.155 | 1-3/8 - 12 | 1.3209 | 1.26 | 1.315 | 1-3/8 - 8 | 1.2938 | 1.155 | 1.233 |
| 1-1/2 - 6 | 1.3917 | 1.294 | 1.405 | 1-1/2 - 12 | 1.4459 | 1.521 | 1.581 | 1-1/2 - 8 | 1.4188 | 1.405 | 1.492 |
| Diámetro tornillo (mm) | Paso | |||
| Standard | Fina | Extra o Súper Fina | JIS | |
| 2 | 0.4 | - | - | 0.4 |
| 2.5 | 0.45 | - | - | 0.45 |
| 3 | 0.5 | - | - | 0.5 |
| 4 | 0.7 | - | - | 0.7 |
| 5 | 0.8 | - | - | 0.8 |
| 6 | 1 | - | - | 1 |
| 7 | 1 | - | - | 1 |
| 8 | 1.25 | 1 | - | 1.25 |
| 10 | 1.5 | 1.25 | 1 | 1.25 |
| 12 | 1.75 | 1.5 | 1.25 | 1.25 |
| 14 | 2 | 1.5 | - | 1.5 |
| 16 | 2 | - | - | 1.5 |
| 18 | 2.5 | - | - | 1.5 |
| 20 | 2.5 | - | - | 1.5 |
| 22 | 2.5 | 1.5, 2 | ||
| 24 | 3 | 2 | ||
| 30 | 3.5 | 2 | ||
| Fraccion | Inches | Milimetros | Fraccion | Inches | Milimetros |
| 1/64 | 0.01563 | 0.3969 | 1/4 | 0.25000 | 6.3500 |
| 1/32 | 0.03125 | 0.7938 | 17/64 | 0.26563 | 6.7469 |
| 0.03937 | 1.0000 | 0.27559 | 7.0000 | ||
| 3/64 | 0.04688 | 1.1906 | 9/32 | 0.28125 | 7.1438 |
| 1/16 | 0.06250 | 1.5875 | 19/64 | 0.29688 | 7.5406 |
| 5/64 | 0.07813 | 1.9844 | 5/16 | 0.31250 | 7.9375 |
| 0.07874 | 2.0000 | 0.31496 | 8.0000 | ||
| 3/32 | 0.09375 | 2.3813 | 21/64 | 0.32813 | 8.3344 |
| 7/64 | 0.10938 | 2.7781 | 11/32 | 0.34375 | 8.7313 |
| 0.11811 | 3.0000 | 0.35433 | 9.0000 | ||
| 1/8 | 0.12500 | 3.1750 | 23/64 | 0.35938 | 9.1281 |
| 9/64 | 0.14063 | 3.5719 | 3/8 | 0.37500 | 9.5250 |
| 5/32 | 0.15625 | 3.9688 | 25/64 | 0.39063 | 9.9219 |
| 0.15748 | 4.0000 | 0.39370 | 10.0000 | ||
| 11/64 | 0.17188 | 4.3656 | 13/32 | 0.40625 | 10.3188 |
| 3/16 | 0.18750 | 4.7625 | 27/64 | 0.42188 | 10.7156 |
| 0.19685 | 5.0000 | 0.43307 | 11.0000 | ||
| 13/64 | 0.20313 | 5.1594 | 7/16 | 0.43750 | 11.1125 |
| 7/32 | 0.21875 | 5.5563 | 29/64 | 0.45313 | 11.5094 |
| 15/64 | 0.23438 | 5.9531 | 15/32 | 0.46875 | 11.9063 |
| 0.23622 | 6.0000 |
Thread pitch of Metric and Imperial Screws
| Metric | Metric Coarse | Metric Fine | Inch Equivalent | UNC tpi* |
UNF tpi* |
BSW tpi |
BSF tpi |
BA tpi |
| M2.5 | 0.45 | 3/32 | No.3-48 | No.3-56 | 48 | 7BA-52.92 | ||
| M3.0 | 0.5 | 7/64 | No.4-40 | No.4-48 | 6BA-47.92 | |||
| 1/8 | No.5-40 | No.5-44 | 40 | 5BA-43.05 | ||||
| M3.5 | 0.6 | 9/64 | No.6-32 | No.6-40 | 4BA-38.49 | |||
| M4.0 | 0.7 | 5/32 | No.8-32 | No.8-36 | 32 | 3BA-34.80 | ||
| M5 | 0.8 | 3/16 | No.10-24 | No.10-32 | 24 | 32 | 2BA-31.36 | |
| 7/32 | No.12-24 | No.12-28 | 24 | 28 | 1BA-28.22 | |||
| M6 | 1 | 1/4 | 20 | 28 | 20 | 26 | 0BA-25.4 | |
| M7 | 1 | |||||||
| M8 | 1.25 | 1 | 5/16 | 18 | 24 | 18 | 22 | |
| M10 | 1.5 | 1.25 | 3/8 | 16 | 24 | 16 | 20 | |
| M11 | 7/16 | 14 | 20 | 14 | 18 | |||
| M12 | 1.75 | 1.25 | 1/2 | 13 | 20 | 12 | 16 | |
| M14 | 2 | 1.5 | 9/16 | 12 | 18 | 12 | 16 | |
| M16 | 2 | 1.5 | 5/8 | 11 | 18 | 11 | 14 | |
| M18 | 2.5 | 3/4 | 10 | 16 | 10 | 12 | ||
| M20 | 2.5 | 1.5 | 3/4 | 10 | 16 | 10 | 12 | |
| M22 | 2.5 | 7/8 | 9 | 14 | 9 | 11 | ||
| M24 | 3 | 2 | 1 | 8 | 12 | 8 | 10 | |
| M27 | 3 | 1 1/8 | 7 | 12 | 7 | 9 | ||
| M30 | 3.5 | 2 | 1 1/4 | 7 | 12 | 7 | 9 | |
| M33 | 3.5 | 1 3/8 | 6 | 12 | 8 | |||
| M36 | 4 | 3 | 1 1/2 | 6 | 12 | 6 | 8 | |
| M39 | 4 | 1 5/8 | 8 | |||||
| M42 | 4.5 | 3 | 1 3/4 | 5 | 5 | 7 | ||
| M48 | 5 | 3 | 1 7/8 | |||||
| M52 | 5 | 4 | 2 | 4 1/2 | ||||
| M60 | 5.5 | 4 | 2 1/4 | 4 1/2 | ||||
| M64 | 6 | 4 | 2 1/2 | 4 |
How to convert a Screw No. to a Metric size?
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