{"id":18377,"date":"2026-09-15T12:41:17","date_gmt":"2026-09-15T04:41:17","guid":{"rendered":"https:\/\/aobosteel.com\/?page_id=18377"},"modified":"2026-10-20T09:00:28","modified_gmt":"2026-10-20T01:00:28","slug":"tap-drill-size-chart","status":"publish","type":"page","link":"https:\/\/aobosteel.com\/es\/tap-drill-size-chart\/","title":{"rendered":"Tabla de tama\u00f1os de brocas para roscar"},"content":{"rendered":"

Tabla de tama\u00f1os de brocas para roscar<\/h1>\n\n\n\n

La broca a utilizar antes de un macho, para roscas UNC y UNF desde #0 hasta 2-1\/2 pulg., para roscas m\u00e9tricas de paso grueso ISO desde M1 hasta M68, y para tama\u00f1os de tornillos de m\u00e1quina con sus brocas de holgura. Los tama\u00f1os de broca se indican como broca de fracci\u00f3n, n\u00famero o letra, con sus equivalentes decimales y en mil\u00edmetros.<\/p>\n\n\n\n

Brocas para roscar para roscas UNC y UNF, tama\u00f1os fraccionarios<\/h2>\n\n\n\n

Roscas de forma National American, que cubren los pasos comunes UNC y UNF, incluidas las series gruesa y fina antiguas. Los tama\u00f1os de broca permiten aproximadamente el 75 por ciento de una rosca completa. Para los tama\u00f1os peque\u00f1os, elegir los tama\u00f1os de agujero mayores de la tabla de l\u00edmites de tama\u00f1o de agujero reduce la rotura de machos. Fuente, Tabla 3.<\/p>\n\n\n\n

Rosca<\/th>Di\u00e1m. de ra\u00edz, pulg.<\/th>Broca para roscar<\/th>Di\u00e1m. de broca, pulg.<\/th>Di\u00e1m. de broca, mm<\/th><\/tr><\/thead>
1\/16 – 64<\/td>0.0422<\/td>3\/64<\/td>0.0469<\/td>1.19<\/td><\/tr>
1\/16 – 72<\/td>0.0445<\/td>3\/64<\/td>0.0469<\/td>1.19<\/td><\/tr>
5\/64 – 60<\/td>0.0563<\/td>1\/16<\/td>0.0625<\/td>1.59<\/td><\/tr>
5\/64 – 72<\/td>0.0601<\/td>52<\/td>0.0635<\/td>1.61<\/td><\/tr>
3\/32 – 48<\/td>0.0667<\/td>49<\/td>0.0730<\/td>1.85<\/td><\/tr>
3\/32 – 50<\/td>0.0678<\/td>49<\/td>0.0730<\/td>1.85<\/td><\/tr>
7\/64 – 48<\/td>0.0823<\/td>43<\/td>0.0890<\/td>2.26<\/td><\/tr>
1\/8 – 32<\/td>0.0844<\/td>3\/32<\/td>0.0937<\/td>2.38<\/td><\/tr>
1\/8 – 40<\/td>0.0925<\/td>38<\/td>0.1015<\/td>2.58<\/td><\/tr>
9\/64 – 40<\/td>0.1081<\/td>32<\/td>0.1160<\/td>2.95<\/td><\/tr>
5\/32 – 32<\/td>0.1157<\/td>1\/8<\/td>0.1250<\/td>3.17<\/td><\/tr>
5\/32 – 36<\/td>0.1202<\/td>30<\/td>0.1285<\/td>3.26<\/td><\/tr>
11\/64 – 32<\/td>0.1313<\/td>9\/64<\/td>0.1406<\/td>3.57<\/td><\/tr>
3\/16 – 24<\/td>0.1334<\/td>26<\/td>0.1470<\/td>3.73<\/td><\/tr>
3\/16 – 32<\/td>0.1469<\/td>22<\/td>0.1570<\/td>3.99<\/td><\/tr>
13\/64 – 24<\/td>0.1490<\/td>20<\/td>0.1610<\/td>4.09<\/td><\/tr>
7\/32 – 24<\/td>0.1646<\/td>16<\/td>0.1770<\/td>4.50<\/td><\/tr>
7\/32 – 32<\/td>0.1782<\/td>12<\/td>0.1890<\/td>4.80<\/td><\/tr>
15\/64 – 24<\/td>0.1806<\/td>10<\/td>0.1935<\/td>4.91<\/td><\/tr>
1\/4 – 20<\/td>0.1850<\/td>7<\/td>0.2010<\/td>5.11<\/td><\/tr>
1\/4 – 24<\/td>0.1959<\/td>4<\/td>0.2090<\/td>5.31<\/td><\/tr>
1\/4 – 27<\/td>0.2019<\/td>3<\/td>0.2130<\/td>5.41<\/td><\/tr>
1\/4 – 28<\/td>0.2036<\/td>3<\/td>0.2130<\/td>5.41<\/td><\/tr>
1\/4 – 32<\/td>0.2094<\/td>7\/32<\/td>0.2187<\/td>5.55<\/td><\/tr>
5\/16 – 18<\/td>0.2403<\/td>F<\/td>0.2570<\/td>6.53<\/td><\/tr>
5\/16 – 20<\/td>0.2476<\/td>17\/64<\/td>0.2656<\/td>6.75<\/td><\/tr>
5\/16 – 24<\/td>0.2584<\/td>I<\/td>0.2720<\/td>6.91<\/td><\/tr>
5\/16 – 27<\/td>0.2644<\/td>J<\/td>0.2770<\/td>7.04<\/td><\/tr>
5\/16 – 32<\/td>0.2719<\/td>9\/32<\/td>0.2812<\/td>7.14<\/td><\/tr>
3\/8 – 16<\/td>0.2938<\/td>5\/16<\/td>0.3125<\/td>7.94<\/td><\/tr>
3\/8 – 20<\/td>0.3100<\/td>21\/64<\/td>0.3281<\/td>8.33<\/td><\/tr>
3\/8 – 24<\/td>0.3209<\/td>Q<\/td>0.3320<\/td>8.43<\/td><\/tr>
3\/8 – 27<\/td>0.3269<\/td>R<\/td>0.3390<\/td>8.61<\/td><\/tr>
7\/16 – 14<\/td>0.3447<\/td>U<\/td>0.3680<\/td>9.35<\/td><\/tr>
7\/16 – 20<\/td>0.3726<\/td>25\/64<\/td>0.3906<\/td>9.92<\/td><\/tr>
7\/16 – 24<\/td>0.3834<\/td>X<\/td>0.3970<\/td>10.08<\/td><\/tr>
7\/16 – 27<\/td>0.3894<\/td>Y<\/td>0.4040<\/td>10.26<\/td><\/tr>
1\/2 – 12<\/td>0.3918<\/td>27\/64<\/td>0.4219<\/td>10.72<\/td><\/tr>
1\/2 – 13<\/td>0.4001<\/td>27\/64<\/td>0.4219<\/td>10.72<\/td><\/tr>
1\/2 – 20<\/td>0.4351<\/td>29\/64<\/td>0.4531<\/td>11.51<\/td><\/tr>
1\/2 – 24<\/td>0.4459<\/td>29\/64<\/td>0.4531<\/td>11.51<\/td><\/tr>
1\/2 – 27<\/td>0.4519<\/td>15\/32<\/td>0.4687<\/td>11.90<\/td><\/tr>
9\/16 – 12<\/td>0.4542<\/td>31\/64<\/td>0.4844<\/td>12.30<\/td><\/tr>
9\/16 – 18<\/td>0.4903<\/td>33\/64<\/td>0.5156<\/td>13.10<\/td><\/tr>
9\/16 – 27<\/td>0.5144<\/td>17\/32<\/td>0.5312<\/td>13.49<\/td><\/tr>
5\/8 – 11<\/td>0.5069<\/td>17\/32<\/td>0.5312<\/td>13.49<\/td><\/tr>
5\/8 – 12<\/td>0.5168<\/td>35\/64<\/td>0.5469<\/td>13.89<\/td><\/tr>
5\/8 – 18<\/td>0.5528<\/td>37\/64<\/td>0.5781<\/td>14.68<\/td><\/tr>
5\/8 – 27<\/td>0.5769<\/td>19\/32<\/td>0.5937<\/td>15.08<\/td><\/tr>
11\/16 – 11<\/td>0.5694<\/td>19\/32<\/td>0.5937<\/td>15.08<\/td><\/tr>
11\/16 – 16<\/td>0.6063<\/td>5\/8<\/td>0.6250<\/td>15.88<\/td><\/tr>
3\/4 – 10<\/td>0.6201<\/td>21\/32<\/td>0.6562<\/td>16.67<\/td><\/tr>
3\/4 – 12<\/td>0.6418<\/td>43\/64<\/td>0.6719<\/td>17.07<\/td><\/tr>
3\/4 – 16<\/td>0.6688<\/td>11\/16<\/td>0.6875<\/td>17.46<\/td><\/tr>
3\/4 – 27<\/td>0.7019<\/td>23\/32<\/td>0.7187<\/td>18.25<\/td><\/tr>
13\/16 – 10<\/td>0.6826<\/td>23\/32<\/td>0.7187<\/td>18.25<\/td><\/tr>
7\/8 – 9<\/td>0.7307<\/td>49\/64<\/td>0.7656<\/td>19.45<\/td><\/tr>
7\/8 – 12<\/td>0.7668<\/td>51\/64<\/td>0.7969<\/td>20.24<\/td><\/tr>
7\/8 – 14<\/td>0.7822<\/td>13\/16<\/td>0.8125<\/td>20.64<\/td><\/tr>
7\/8 – 18<\/td>0.8028<\/td>53\/64<\/td>0.8281<\/td>21.03<\/td><\/tr>
7\/8 – 27<\/td>0.8269<\/td>27\/32<\/td>0.8437<\/td>21.43<\/td><\/tr>
15\/16 – 9<\/td>0.7932<\/td>53\/64<\/td>0.8281<\/td>21.03<\/td><\/tr>
1 – 8<\/td>0.8376<\/td>7\/8<\/td>0.8750<\/td>22.22<\/td><\/tr>
1 – 12<\/td>0.8918<\/td>59\/64<\/td>0.9219<\/td>23.42<\/td><\/tr>
1 – 14<\/td>0.9072<\/td>15\/16<\/td>0.9375<\/td>23.81<\/td><\/tr>
1 – 27<\/td>0.9519<\/td>31\/32<\/td>0.9687<\/td>24.60<\/td><\/tr>
1 1\/8 – 7<\/td>0.9394<\/td>63\/64<\/td>0.9844<\/td>25.00<\/td><\/tr>
1 1\/8 – 12<\/td>1.0168<\/td>1 3\/64<\/td>1.0469<\/td>26.59<\/td><\/tr>
1 1\/4 – 7<\/td>1.0644<\/td>1 7\/64<\/td>1.1094<\/td>28.18<\/td><\/tr>
1 1\/4 – 12<\/td>1.1418<\/td>1 11\/64<\/td>1.1719<\/td>29.77<\/td><\/tr>
1 3\/8 – 6<\/td>1.1585<\/td>1 7\/32<\/td>1.2187<\/td>30.95<\/td><\/tr>
1 3\/8 – 12<\/td>1.2668<\/td>1 19\/64<\/td>1.2969<\/td>32.94<\/td><\/tr>
1 1\/2 – 6<\/td>1.2835<\/td>1 11\/32<\/td>1.3437<\/td>34.13<\/td><\/tr>
1 1\/2 – 12<\/td>1.3918<\/td>1 27\/64<\/td>1.4219<\/td>36.12<\/td><\/tr>
1 5\/8 – 5 1\/2<\/td>1.3888<\/td>1 29\/64<\/td>1.4531<\/td>36.91<\/td><\/tr>
1 3\/4 – 5<\/td>1.4902<\/td>1 9\/16<\/td>1.5625<\/td>39.69<\/td><\/tr>
1 7\/8 – 5<\/td>1.6152<\/td>1 11\/16<\/td>1.6875<\/td>42.86<\/td><\/tr>
2 – 4 1\/2<\/td>1.7113<\/td>1 25\/32<\/td>1.7812<\/td>45.24<\/td><\/tr>
2 1\/8 – 4 1\/2<\/td>1.8363<\/td>1 29\/32<\/td>1.9062<\/td>48.42<\/td><\/tr>
2 1\/4 – 4 1\/2<\/td>1.9613<\/td>2 1\/32<\/td>2.0312<\/td>51.59<\/td><\/tr>
2 3\/8 – 4<\/td>2.0502<\/td>2 1\/8<\/td>2.1250<\/td>53.97<\/td><\/tr>
2 1\/2 – 4<\/td>2.1752<\/td>2 1\/4<\/td>2.2500<\/td>57.15<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

El di\u00e1m. de broca, mm se convierte del valor en pulgadas a 1 pulg. = 25,4 mm. Las roscas desde #0 hasta 1 pulg. tambi\u00e9n se listan a continuaci\u00f3n con sus brocas de holgura.<\/p>\n\n\n\n

Brocas para roscar y brocas de holgura para tornillos de m\u00e1quina<\/h2>\n\n\n\n

Tornillos de m\u00e1quina numerados y fraccionarios peque\u00f1os: la broca para roscar de la rosca, y las brocas de holgura de ajuste estrecho y ajuste libre utilizadas cuando el tornillo pasa a trav\u00e9s de la pieza. Cuando un tama\u00f1o tiene m\u00e1s de un paso, los valores se listan para cada paso en el orden mostrado. Fuente, Tabla 4.<\/p>\n\n\n\n

Tama\u00f1o<\/th>Di\u00e1m., pulg.<\/th>Roscas por pulg.<\/th>Broca para roscar<\/th>Di\u00e1m. de broca, pulg.<\/th>Broca de ajuste estrecho<\/th>Di\u00e1m., pulg.<\/th>Broca de ajuste libre<\/th>Di\u00e1m., pulg.<\/th><\/tr><\/thead>
0<\/td>.060<\/td>80<\/td>3\u204464<\/td>.0469<\/td>52<\/td>.0635<\/td>50<\/td>.0700<\/td><\/tr>
1<\/td>.073<\/td>64\n72<\/td>53\n53<\/td>.0595\n.0595<\/td>48<\/td>.0760<\/td>46<\/td>.0810<\/td><\/tr>
2<\/td>.086<\/td>56\n64<\/td>50\n50<\/td>.0700\n.0700<\/td>43<\/td>.0890<\/td>41<\/td>.0960<\/td><\/tr>
3<\/td>.099<\/td>48\n56<\/td>47\n45<\/td>.0785\n.0820<\/td>37<\/td>.1040<\/td>35<\/td>.1100<\/td><\/tr>
4<\/td>.112<\/td>36a\n40\n48<\/td>44\n43\n42<\/td>.0860\n.0890\n.0935<\/td>32<\/td>.1160<\/td>30<\/td>.1285<\/td><\/tr>
5<\/td>.125<\/td>40\n44<\/td>38\n37<\/td>.1015\n.1040<\/td>30<\/td>.1285<\/td>29<\/td>.1360<\/td><\/tr>
6<\/td>.138<\/td>32\n40<\/td>36\n33<\/td>.1065\n.1130<\/td>27<\/td>.1440<\/td>25<\/td>.1495<\/td><\/tr>
8<\/td>.164<\/td>32\n36<\/td>29\n29<\/td>.1360\n.1360<\/td>18<\/td>.1695<\/td>16<\/td>.1770<\/td><\/tr>
10<\/td>.190<\/td>24\n32<\/td>25\n21<\/td>.1495\n.1590<\/td>9<\/td>.1960<\/td>7<\/td>.2010<\/td><\/tr>
12<\/td>.216<\/td>24\n28<\/td>16\n14<\/td>.1770\n.1820<\/td>2<\/td>.2210<\/td>1<\/td>.2280<\/td><\/tr>
14<\/td>.242<\/td>20a\n24a<\/td>10\n7<\/td>.1935\n.2010<\/td>D<\/td>.2460<\/td>F<\/td>.2570<\/td><\/tr>
1\u20444<\/td>.250<\/td>20\n28<\/td>7\n3<\/td>.2010\n.2130<\/td>F<\/td>.2570<\/td>H<\/td>.2660<\/td><\/tr>
5\u204416<\/td>.3125<\/td>18\n24<\/td>F\nI<\/td>.2570\n.2720<\/td>P<\/td>.3230<\/td>Q<\/td>.3320<\/td><\/tr>
3\u20448<\/td>.375<\/td>16\n24<\/td>5\u204416\nQ<\/td>.3125\n.3320<\/td>W<\/td>.3860<\/td>X<\/td>.3970<\/td><\/tr>
7\u204416<\/td>.4375<\/td>14\n20<\/td>U\n25\u204464<\/td>.3680\n.3906<\/td>29\u204464<\/td>.4531<\/td>15\u204432<\/td>.4687<\/td><\/tr>
1\u20442<\/td>.500<\/td>13\n20<\/td>27\u204464\n29\u204464<\/td>.4219\n.4531<\/td>33\u204464<\/td>.5156<\/td>17\u204432<\/td>.5312<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Brocas para roscar para roscas m\u00e9tricas de paso grueso ISO<\/h2>\n\n\n\n

Tama\u00f1os de broca para roscar recomendados y alternativos para roscas m\u00e9tricas de paso grueso, en mil\u00edmetros. Los tama\u00f1os recomendados dan un compromiso radial te\u00f3rico de aproximadamente el 81 por ciento, los tama\u00f1os alternativos aproximadamente del 70 al 75 por ciento. La tabla es solo para machos de ranuras, un macho sin ranuras (conformado en fr\u00edo) requiere un tama\u00f1o de agujero diferente. Fuente, Tabla 6.<\/p>\n\n\n\n

Rosca<\/th>Broca recomendada, mm<\/th>Compromiso radial, %<\/th>Broca alternativa, mm<\/th>Compromiso radial, %<\/th><\/tr><\/thead>
M1<\/td>0.75<\/td>81.5<\/td>0.78<\/td>71.7<\/td><\/tr>
M1.1<\/td>0.85<\/td>81.5<\/td>0.88<\/td>71.7<\/td><\/tr>
M1.2<\/td>0.95<\/td>81.5<\/td>0.98<\/td>71.7<\/td><\/tr>
M1.4<\/td>1.10<\/td>81.5<\/td>1.15<\/td>67.9<\/td><\/tr>
M1.6<\/td>1.25<\/td>81.5<\/td>1.30<\/td>69.9<\/td><\/tr>
M1.8<\/td>1.45<\/td>81.5<\/td>1.50<\/td>69.9<\/td><\/tr>
M2<\/td>1.60<\/td>81.5<\/td>1.65<\/td>71.3<\/td><\/tr>
M2.2<\/td>1.75<\/td>81.5<\/td>1.80<\/td>72.5<\/td><\/tr>
M2.5<\/td>2.05<\/td>81.5<\/td>2.10<\/td>72.5<\/td><\/tr>
M3<\/td>2.50<\/td>81.5<\/td>2.55<\/td>73.4<\/td><\/tr>
M3.5<\/td>2.90<\/td>81.5<\/td>2.95<\/td>74.7<\/td><\/tr>
M4<\/td>3.30<\/td>81.5<\/td>3.40<\/td>69.9b<\/td><\/tr>
M4.5<\/td>3.70<\/td>86.8<\/td>3.80<\/td>76.1<\/td><\/tr>
M5<\/td>4.20<\/td>81.5<\/td>4.30<\/td>71.3b<\/td><\/tr>
M6<\/td>5.00<\/td>81.5<\/td>5.10<\/td>73.4<\/td><\/tr>
M7<\/td>6.00<\/td>81.5<\/td>6.10<\/td>73.4<\/td><\/tr>
M8<\/td>6.80<\/td>78.5<\/td>6.90<\/td>71.7b<\/td><\/tr>
M9<\/td>7.80<\/td>78.5<\/td>7.90<\/td>71.7b<\/td><\/tr>
M10<\/td>8.50<\/td>81.5<\/td>8.60<\/td>76.1<\/td><\/tr>
M11<\/td>9.50<\/td>81.5<\/td>9.60<\/td>76.1<\/td><\/tr>
M12<\/td>10.20<\/td>83.7<\/td>10.40<\/td>74.5b<\/td><\/tr>
M14<\/td>12.00<\/td>81.5<\/td>12.20<\/td>73.4b<\/td><\/tr>
M16<\/td>14.00<\/td>81.5<\/td>14.25<\/td>71.3c<\/td><\/tr>
M18<\/td>15.50<\/td>81.5<\/td>15.75<\/td>73.4c<\/td><\/tr>
M20<\/td>17.50<\/td>81.5<\/td>17.75<\/td>73.4c<\/td><\/tr>
M22<\/td>19.50<\/td>81.5<\/td>19.75<\/td>73.4c<\/td><\/tr>
M24<\/td>21.00<\/td>81.5<\/td>21.25<\/td>74.7b<\/td><\/tr>
M27<\/td>24.00<\/td>81.5<\/td>24.25<\/td>74.7b<\/td><\/tr>
M30<\/td>26.50<\/td>81.5<\/td>26.75<\/td>75.7b<\/td><\/tr>
M33<\/td>29.50<\/td>81.5<\/td>29.75<\/td>75.7b<\/td><\/tr>
M36<\/td>32.00<\/td>81.5<\/td>\u2026<\/td>\u2026<\/td><\/tr>
M39<\/td>35.00<\/td>81.5<\/td>\u2026<\/td>\u2026<\/td><\/tr>
M42<\/td>37.50<\/td>81.5<\/td>\u2026<\/td>\u2026<\/td><\/tr>
M45<\/td>40.50<\/td>81.5<\/td>\u2026<\/td>\u2026<\/td><\/tr>
M48<\/td>43.00<\/td>81.5<\/td>\u2026<\/td>\u2026<\/td><\/tr>
M52<\/td>47.00<\/td>81.5<\/td>\u2026<\/td>\u2026<\/td><\/tr>
M56<\/td>50.50<\/td>81.5<\/td>\u2026<\/td>\u2026<\/td><\/tr>
M60<\/td>54.50<\/td>81.5<\/td>\u2026<\/td>\u2026<\/td><\/tr>
M64<\/td>58.00<\/td>81.5<\/td>\u2026<\/td>\u2026<\/td><\/tr>
M68<\/td>62.00<\/td>81.5<\/td>\u2026<\/td>\u2026<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Notas al pie en la fuente: (b) solo para roscas de clase de tolerancia 6H y 7H; (c) solo para roscas de clase de tolerancia 7H; los puntos suspensivos marcan los tama\u00f1os donde no se lista ninguna broca alternativa.<\/p>\n\n\n\n