¿Alguna vez ha tenido problemas para encontrar el tamaño de broca adecuado para roscar tornillos? Esta guía desmitifica el proceso con una tabla completa en la que se detallan los tamaños de rosca métrica, UNC y fina. Tanto si trabaja en un proyecto de ingeniería preciso como en tareas mecánicas cotidianas, este artículo le proporcionará las medidas exactas que necesita. Sumérjase y asegúrese de que sus trabajos de roscado son precisos y eficaces.
Grado | Diámetro nominal | Tamaño de la broca del macho de 2ª clase | |
Max | Min | ||
M1.0×0.25 | 0.75 | 0.785 | 0.729 |
M1.1×0.25 | 0.85 | 0.885 | 0.829 |
M1.2×0.25 | 0.95 | 0.985 | 0.985 |
M1.4×0.3 | 1.10 | 1.142 | 1.075 |
M1.6×0.35 | 1.25 | 1.321 | 1.221 |
M1.7×0.35 | 1.35 | 1.421 | 1.321 |
M1.8×0.35 | 1.45 | 1.521 | 1.421 |
M2.0×0.4 | 1.60 | 1.679 | 1.567 |
M2.2×0.45 | 1.75 | 1.838 | 1.713 |
M2.3×0.4 | 1.90 | 1.979 | 1.867 |
M2.5×0.45 | 2.10 | 2.138 | 2.013 |
M2.6×0.45 | 2.20 | 2.238 | 2.113 |
M3.0×0.5 | 2.50 | 2.599 | 2.459 |
M3.0×0.6 | 2.40 | 2.440 | 2.280 |
M3.5×0.6 | 2.90 | 3.010 | 2.850 |
M4.0×0.7 | 3.30 | 3.422 | 3.242 |
M4.0×0.75 | 3.25 | 3.326 | 3.106 |
M4.5×0.75 | 3.80 | 3.878 | 3.688 |
M5.0×0.8 | 4.20 | 4.334 | 4.134 |
M5.0×0.9 | 4.10 | 4.170 | 3.930 |
M6.0×1.0 | 5.00 | 5.153 | 4.917 |
M7.0×1.0 | 6.00 | 6.153 | 5.917 |
M8.0×1.25 | 6.80 | 6.912 | 6.647 |
M9.0×1.25 | 7.80 | 7.912 | 7.647 |
M10×1.5 | 8.50 | 8.676 | 8.376 |
M11×1.5 | 9.50 | 9.676 | 9.376 |
M12×1.75 | 10.30 | 10.441 | 10.106 |
M14×2.0 | 12.00 | 12.210 | 11.835 |
M16×2.0 | 14.00 | 14.210 | 13.835 |
M18×2.5 | 15.50 | 15.744 | 15.294 |
M20×2.5 | 17.50 | 17.744 | 17.294 |
M22×2.5 | 19.50 | 19.744 | 19.294 |
M24×3.0 | 21.00 | 21.252 | 20.752 |
M27×3.0 | 24.00 | 24.252 | 23.752 |
M30×3.5 | 26.50 | 26.771 | 26.211 |
Grado(UNC) | Diámetro nominal | Tamaño de la broca del macho de 2ª clase | |
Max | Min | ||
Nº 1-64(1.854) | 1.55 | 1.582 | 1.425 |
NO.2-56(2.184) | 1.80 | 1.871 | 1.695 |
NO.3-48(2.515) | 2.10 | 2.146 | 1.941 |
NO.4-40(2.845) | 2.30 | 2.385 | 2.157 |
NO.5-40(3.175) | 2.60 | 2.697 | 2.487 |
NO.6-32(3.505) | 2.80 | 2.895 | 2.642 |
NO8-32(4.166) | 3.40 | 3.53 | 3.302 |
Nº 10-24(4.826) | 3.90 | 3.962 | 3.683 |
Nº 12-24(5.486) | 4.50 | 4.597 | 4.344 |
1/4-20 | 5.10 | 5.257 | 4.979 |
5/16-18 | 6.60 | 6.731 | 6.401 |
3/8-16 | 8.00 | 8.153 | 7.798 |
7/16-14 | 9.40 | 9.55 | 9.144 |
1/2-13 | 10.80 | 11.023 | 10.592 |
9/16-12 | 12.20 | 12.446 | 11.989 |
5/8-11 | 13.60 | 12.868 | 13.386 |
3/4-10 | 16.50 | 18.840 | 16.307 |
7/8-9 | 19.50 | 19.761 | 19.177 |
1 | 22.20 | 22.606 | 21.971 |
1-1/8-7 | 25.00 | 25.349 | 24.638 |
1-1/4-7 | 28.20 | 28.524 | 27.813 |
1-3/8-6 | 30.80 | 31.115 | 30.353 |
1-1/2-6 | 34.00 | 34.290 | 33.528 |
1-3/4-5 | 39.50 | 39.827 | 38.964 |
2-4-1/2 | 45.20 | 45.593 | 44.679 |
Grado | Diámetro nominal | Tamaño de la broca del macho de 2ª clase | |
Max | Min | ||
M1.0×0.2 | 0.80 | 0.821 | 0.783 |
M1.1×0.2 | 0.90 | 0.921 | 0.883 |
M1.2×0.2 | 1.00 | 1.021 | 0.983 |
M1.4×0.2 | 1.20 | 1.221 | 1.183 |
M1.6×0.2 | 1.40 | 1.421 | 1.383 |
M1.7×0.2 | 1.45 | 1.500 | 1.460 |
M1.8×0.2 | 1.60 | 1.621 | 1.583 |
M2.0×0.25 | 1.75 | 1.785 | 1.729 |
M2.2×0.25 | 1.95 | 1.985 | 1.929 |
M2.3×0.25 | 2.05 | 2.061 | 2.001 |
M2.5×0.35 | 2.20 | 2.221 | 2.121 |
M2.6×0.35 | 2.20 | 2.246 | 2.186 |
M3.0×0.35 | 2.70 | 2.721 | 2.621 |
M3.5×0.35 | 3.20 | 3.221 | 3.121 |
M4.0×0.5 | 3.50 | 3.599 | 3.459 |
M4.5×0.5 | 4.00 | 4.099 | 3.959 |
M5.0×0.5 | 4.50 | 4.599 | 4.459 |
M5.5×0.5 | 5.00 | 5.099 | 4.959 |
M6.0×0.75 | 5.30 | 5.378 | 5.188 |
M6.0×0.5 | 5.50 | 5.550 | 5.400 |
M7.0×0.75 | 6.30 | 6.378 | 6.188 |
M7.0×0.5 | 6.50 | 6.550 | 6.400 |
M8.0×1.0 | 7.00 | 7.153 | 6.917 |
M8.0×0.75 | 7.30 | 7.378 | 7.188 |
M8.0×0.5 | 7.50 | 7.520 | 7.400 |
M9.0×1.0 | 8.00 | 8.153 | 7.917 |
M9.0×0.75 | 8.30 | 8.378 | 8.188 |
M10×1.25 | 8.80 | 8.912 | 8.647 |
M10×1.0 | 9.00 | 9.153 | 8.917 |
M10×0.75 | 9.30 | 9.378 | 9.188 |
M10×0.5 | 9.50 | 9.520 | 9.400 |
M11×1.0 | 10.00 | 10.153 | 9.917 |
M11×0.75 | 10.30 | 10.378 | 10.188 |
M12×1.5 | 10.50 | 10.676 | 10.376 |
M12×1.25 | 10.80 | 10.912 | 10.647 |
M12×1.0 | 11.00 | 11.153 | 10.917 |
M12×0.5 | 11.50 | 11.520 | 11.400 |
M14×1.5 | 12.50 | 12.676 | 12.376 |
M14×1.0 | 13.00 | 13.153 | 12.917 |
M15×1.5 | 13.50 | 13.676 | 13.376 |
M15×1.0 | 14.00 | 14.153 | 13.917 |
M16×1.5 | 14.50 | 14.676 | 14.376 |
M16×1.0 | 15.00 | 15.153 | 14.917 |
M17×1.5 | 15.50 | 15.676 | 15.376 |
M17×1.0 | 16.00 | 16.153 | 15.917 |
M18×2.0 | 16.00 | 16.210 | 15.835 |
M18×1.5 | 16.50 | 16.676 | 16.376 |
M18×1.0 | 17.00 | 17.153 | 16.917 |
M20×2.0 | 18.00 | 18.210 | 17.835 |
M20×1.5 | 18.50 | 18.676 | 18.376 |
M20×1.0 | 19.00 | 19.153 | 18.917 |
M22×2.0 | 20.00 | 20.210 | 19.835 |
M22×1.5 | 20.50 | 20.676 | 20.376 |
M22×1.0 | 21.00 | 21.153 | 20.917 |
M24×2.0 | 22.00 | 22.210 | 21.835 |
M24×1.5 | 22.50 | 22.676 | 22.376 |
M24×1.0 | 23.00 | 23.153 | 22.917 |
M25×2.0 | 23.00 | 23.210 | 22.835 |
M25×1.5 | 23.50 | 23.676 | 23.376 |
M25×1.0 | 24.00 | 24.153 | 23.917 |
M26×1.5 | 24.50 | 24.676 | 24.376 |
M27×2.0 | 25.00 | 25.210 | 24.835 |
M27×1.5 | 25.50 | 25.676 | 25.376 |
M27×1.0 | 26.00 | 26.153 | 25.917 |
M28×2.0 | 26.00 | 26.210 | 25.835 |
M28×1.5 | 26.50 | 26.676 | 26.376 |
M28×1.0 | 27.00 | 27.153 | 26.917 |
M30×3.0 | 27.00 | 27.252 | 26.752 |
M30×2.0 | 28.00 | 28.210 | 27.835 |
M30×1.5 | 28.50 | 28.676 | 28.376 |
M30×1.0 | 29.00 | 29.153 | 28.917 |
M32×2.0 | 30.00 | 30.210 | 29.835 |
M32×1.5 | 30.50 | 30.676 | 30.376 |
M33×3.0 | 30.00 | 30.252 | 29.752 |
M33×2.0 | 31.00 | 31.210 | 30.835 |
M33×1.5 | 31.50 | 31.676 | 31.376 |
M35×1.5 | 33.50 | 33.676 | 33.376 |
M36×3.0 | 33.00 | 33.252 | 32.752 |
M36×2.0 | 34.00 | 34.210 | 33.835 |
M36×1.5 | 34.50 | 34.676 | 34.376 |
Grado(UNC) | Diámetro nominal | Tamaño de la broca del macho de 2ª clase | |
Max | Min | ||
NO.0-80(1.524) | 1.25 | 1.305 | 1.182 |
Nº 1-72(1.854) | 1.55 | 1.612 | 1.474 |
Nº 2-64(2.184) | 1.85 | 1.912 | 1.756 |
Nº 3-56(2.515) | 2.10 | 2.197 | 2.025 |
NO.4-48(2.845) | 2.40 | 2.458 | 2.271 |
NO.5-44(3.175) | 2.70 | 2.740 | 2.551 |
NO.6-40(3.505) | 2.90 | 3.022 | 2.820 |
NO.8-36(4.166) | 3.50 | 3.606 | 3.404 |
Nº 10-32(4.826) | 4.10 | 4.165 | 3.963 |
Nº 12-28(5.846) | 4.60 | 4.724 | 4.496 |
1/4-28 | 5.50 | 5.588 | 5.360 |
5/16-24 | 6.90 | 7.035 | 6.782 |
3/8-24 | 8.50 | 8.636 | 8.382 |
7/16-20 | 9.90 | 10.033 | 9.729 |
1/2-20 | 11.50 | 11.607 | 11.329 |
9/16-18 | 12.90 | 13.081 | 12.751 |
5/8-18 | 14.50 | 14.681 | 14.351 |
3/4-16 | 17.50 | 17.678 | 17.323 |
7/8-14 | 20.50 | 20.675 | 20.270 |
1-12 | 23.20 | 23.571 | 23.114 |
1-1/8-12 | 26.50 | 26.746 | 26.289 |
1-1/4-12 | 29.50 | 29.921 | 29.464 |
1-3/8-12 | 32.80 | 33.096 | 32.639 |
1-1/2-12 | 36.00 | 36.271 | 35.814 |
Grado | Nivel de precisión | ||
G4-G6 | G7-G8 | G9 | |
M1.0×0.25 | 0.86 | 0.88 | - |
M1.1×0.25 | 0.96 | 0.98 | - |
M1.2×0.25 | 1.06 | 1.08 | - |
M1.4×0.3 | 1.24 | 1.25 | - |
M1.6×0.35 | 1.41 | 1.43 | - |
M1.7×0.35 | 1.51 | 1.53 | - |
M1.8×0.35 | 1.61 | 1.63 | - |
M2.0×0.4 | 1.78 | 1.80 | - |
M2.2×0.45 | 1.95 | 1.98 | - |
M2.3×0.4 | 2.08 | 2.10 | - |
M2.5×0.45 | 2.25 | 2.28 | - |
M2.6×0.45 | 2.35 | 2.38 | - |
M3.0×0.5 | 2.73 | 2.75 | - |
M3.5×0.6 | 3.17 | 3.20 | - |
M4.0×0.7 | 3.62 | 3.65 | 3.69 |
M5.0×0.8 | 4.56 | 4.60 | 4.64 |
M6.0×1.0 | 5.45 | 5.50 | 5.55 |
M7.0×1.0 | 6.45 | 6.50 | 6.55 |
M8.0×1.25 | 7.31 | 7.38 | 7.44 |
M10×1.5 | 9.18 | 9.25 | 9.32 |
M10×1.25 | 9.31 | 9.38 | 9.44 |
M12×1.75 | 11.04 | 11.12 | 11.21 |
M12×1.25 | 11.31 | 11.38 | 11.44 |
Grado | Nivel de precisión | ||
G4-G6 | G7-G8 | G9 | |
NO.2-56UNC | 1.94 | - | - |
Nº 3-48 | 2.23 | - | - |
Nº 4-40 | 2.50 | - | - |
Nº 5-40 | 2.83 | - | - |
Nº 6-32 | 3.07 | - | - |
Nº 8-32 | 3.73 | 3.77 | - |
Nº 10-24 | 4.24 | 4.3 | - |
Nº 12-24 | 4.90 | 4.96 | - |
1/4-20 | - | 5.72 | - |
5/16-18 | - | 7.24 | - |
3/8-16 | - | 8.74 | 8.81 |
7/16-14 | - | 10.20 | 10.30 |
1/2-13 | - | 11.27 | 11.82 |
Nº 2-64UNF | 1.97 | - | - |
Nº 3-56 | 2.27 | - | - |
Nº 4-48 | 2.56 | - | - |
Nº 5-44 | 2.86 | - | - |
Nº 6-40 | 3.16 | - | - |
Nº 8-36 | 3.78 | - | - |
Nº 10-32 | 4.39 | 4.43 | - |
Nº 12-28 | 4.99 | 5.04 | - |
1/4-28 | 5.85 | 5.90 | - |
5/16-24 | 7.36 | 7.41 | - |
3/8-24 | - | 9.00 | - |
7/16-20 | - | 10.48 | 10.54 |
1/2-20 | - | 12.07 | 12.13 |
Rosca fina estándar americana | |||
Grado(UNEF) | Diámetro nominal | Tamaño de la broca del macho de 2ª clase | |
Max | Min | ||
Nº 12-32 | 4.70 | 4.826 | 4.623 |
1/4 -32 | 5.60 | 5.690 | 5.486 |
5/16 -32 | 7.10 | 7.264 | 7.087 |
3/8 -32 | 8.70 | 8.865 | 8.661 |
7/16 -28 | 10.20 | 10.338 | 10.135 |
1/2 -28 | 11.80 | 11.938 | 11.709 |
9/16 -24 | 13.20 | 13.386 | 13.132 |
5/8 -24 | 14.80 | 14.986 | 14.732 |
3/4 -20 | 17.80 | 17.958 | 17.678 |
7/8 -20 | 21.00 | 21.133 | 20.853 |
1 -20 | 24.00 | 24.308 | 24.028 |
Rosca eléctrica estándar británica | |
Grado | Perforación diámetro |
2BA | 4.0-4.2 |
3BA | |
4BA | 3.0-3.2 |
5BA | 2.7-2.8 |
6BA | 2.4-2.5 |
Rosca inglesa para tubos | Rosca inglesa para tubos | Rosca de tubo americana | ||||||||||
Grado | Diámetro estándar | Diámetro del orificio de perforación | Grado | Diámetro estándar | el diámetro interior mínimo de la porción no roscada con la longitud de los dientes de intersección (mínimo) | el diámetro interior mínimo de la porción no roscada con la longitud estándar (mínima) | Grado | Diámetro del orificio de perforación | ||||
Max | Min | al utilizar una herramienta de roscado | cuando no se utiliza una herramienta de roscado | NPT | NPS | |||||||
al utilizar una herramienta de roscado | cuando no se utiliza una herramienta de roscado | |||||||||||
PS 16/1 - 28 | 6.50 | 6.632 | 6.490 | PT 16/1 - 28 | 6.10 | 6.20 | 6.244 | 6.384 | 1/16 – 27 | 6.10 | 6.25 | 6.35 |
PS 1/8 - 28 | 8.50 | 8.637 | 8.495 | PT 1/8 - 28 | 8.10 | 8.20 | 8.249 | 8.388 | 1/8 – 27 | 8.33 | 8.43 | 8.74 |
PS 1/4 - 19 | 11.40 | 11.549 | 11.341 | PT 1/4 - 19 | 10.70 | 11.00 | 10.962 | 11.174 | 1/4 – 18 | 10.72 | 11.13 | 11.13 |
PS 3/8 - 19 | 15.00 | 15.054 | 14.846 | PT 3/8 - 19 | 14.20 | 14.50 | 14.448 | 14.658 | 3/8 – 18 | 14.27 | 14.27 | 14.68 |
PS 1/2 - 14 | 18.50 | 18.773 | 18.489 | PT 1/2 - 14 | 17.60 | 18.00 | 17.979 | 18.263 | 1/2 – 14 | 17.48 | 17.86 | 18.26 |
PS 3/4 -14 | 24.00 | 24.259 | 23.975 | PT 3/4 - 14 | 23.00 | 23.50 | 23.378 | 23.663 | 3/4 – 14 | 22.63 | 23.01 | 23.42 |
PS 1 - 11 | 30.20 | 30.471 | 30.111 | PT 1- 11 | 29.00 | 29.50 | 29.459 | 29.822 | 1 – 11-1/2 | 28.58 | 28.98 | 29.36 |
PS 1-1/4 - 11 | 38.80 | 39.132 | 38.772 | PT 1-1/4 - 11 | 37.50 | 38.00 | 37.976 | 38.339 | 1-1/4-11-1/2 | 37.31 | 37.69 | 38.10 |
PS 1-1/2 - 11 | 44.80 | 45.025 | 44.665 | PT 1-1/2 - 11 | 43.40 | 44.00 | 43.869 | 44.232 | 1-1/2-11-1/2 | 43.66 | 44.04 | 44.45 |
PS 2 - 11 | 56.50 | 56.836 | 56.476 | PT 2 - 11 | 54.90 | 55.50 | 55.412 | 55.844 | 2 – 11 – 1/2 | 55.58 | 55.96 | 56.36 |
Rosca imperial | Rosca métrica | Hilo para carro de agujas | ||||
Grado (UNEF) | Diámetro de la broca | Grado | Diámetro de rodadura | Grado | Diámetro de rodadura | |
Material duro | Material blando | |||||
W 1/8 - 40 | 2.65 | 2.60 | M3×0.5 | 2.63-2.60 | SM1/8-40 | 2.735-2.688 |
W 5/32 - 32 | 3.25 | 3.20 | M3.0×0.6 | 2.56-2.53 | SM1/8-44 | 2.769-2.722 |
W 3/16 - 24 | 3.75 | 3.70 | M3.5×0.6 | 3.06-3.03 | SM9/64-40 | 3.128-3.083 |
W 1/4 - 20 | 5.10 | 5.00 | M4.0×0.7 | 3.49-3.45 | SM11/64-40 | 3.855-3.805 |
W 5/16 - 18 | 6.60 | 6.50 | M4.0×0.75 | 3.45-3.41 | SM3/16-32 | 4.205-4.155 |
W 3/8 - 16 | 8.00 | 7.90 | M4.5×0.75 | 3.96-3.92 | SM3/16-28 | 4.143-4.093 |
W 7/16 - 14 | 9.40 | 9.30 | M5.0×0.8 | 4.43-4.38 | SM7/32-32 | 5.003-4.955 |
W 1/2 - 12 | 10.70 | 10.50 | M5.0×0.9 | 4.36-4.31 | SM15/64-28 | 5.325-5.570 |
W 9/16 - 12 | 12.30 | 12.00 | M6.0×1.0 | 5.30-5.25 | SM1/4-40 | 5.890-5.735 |
W 5/8 - 11 | 13.70 | 13.50 | M7.0×1.0 | 6.30-6.25 | SM1/4-28 | 5.721-5.366 |
W 3/4 - 10 | 16.70 | 16.50 | M8.0×1.0 | 7.28-7.23 | SM9/32-28 | 6.508-6.648 |
W 7/8 - 9 | 19.50 | 19.30 | M8.0×1.25 | 7.12-7.07 | SM11/32-28 | 8.092-8.432 |
W1 - 8 | 22.40 | 22.00 | SM3/8-28 | 8.880-8.015 | ||
W 1-1/8 - 7 | 25.00 | 24.80 | SM7/16-28 | 10.466-10.401 | ||
W 1 - 1/4 - 7 | 28.30 | 28.00 | SM7/16-16 | 10.037-9.967 | ||
SM1/2-20 | 11.819-11.749 | |||||
SM9/26-20 | 13.400-13.425 |