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Cálculo do torque admissível do aperto do parafuso T = C.D .F F = t.AF onde: T = C.D.t.AF T - Torque admissível [Kgf.mm] F - Força admissível [Kgf] C = Coeficiente de correção C = 0,15 - com lubrificação t - Tensão admissível [Kgf/mm2] C = 0,20 - sem lubrificação te - Tensão de escoamento [Kgf/mm2] tr - Tensão de ruptura [Kgf/mm2] Considerando C sem lubrificação, temos: F 0 7 0 - 3,1415 D - Diâmetro nominal [mm] T = 0,2.D .t.AF [Kgf.m] AF = Área do filete 1000 AF = ( (Ø NÚCLEO + Ø FLANCO)/2) 2 * F 0 7 0/ 4 MA= (Rosca métrica grossa ou normal) Torque admissível para aperto de parafusos MB= (Rosca métrica fina) Para parafusos da série métrica temos: - Classe 4.6 - Classe 5.8 - Classe 8.8 tr = 40 Kgf/mm2 tr = 50 Kgf/mm2 tr = 80 Kgf/mm2 te = 24 Kgf/mm2 te = 40 Kgf/mm2 te = 64 Kgf/mm2 - Classe 9.8 - Classe 10.9 - Classe 12.9 tr = 90 Kgf/mm2 tr = 100 Kgf/mm2 tr = 120 Kgf/mm2 te = 72 Kgf/mm2 te = 90 Kgf/mm2 te = 108 Kgf/mm2 Para parafusos da série polegada temos: - Grau 1 - Grau 2 - Grau 5 tr = 42 Kgf/mm2 tr = 52 Kgf/mm2 tr = 84 Kgf/mm2 te = 25.3 Kgf/mm2 te = 40 Kgf/mm2 te = 64.7 Kgf/mm2 - Grau 7 - Grau 8 tr = 93.5 Kgf/mm2 tr = 105.4 Kgf/mm2 te = 80.8 Kgf/mm2 te = 91.4 Kgf/mm2 TORQUE ADMISSÍVEL [Kgf*m] - SÉRIE MÉTRICA ITEM BITOLA TENSÃO ADMISSÍVEL = 90% DA TENSÃO DE ESCOAMENTO AF CL 4.6 CL 5.8 CL 8.8 CL 9.8 CL 10.8 CL 12.9 01 MA 5 13,614 0,294 0,490 0,784 0,882 1,103 1,323 02 MB 5 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 03 MA 6 19,333 0,501 0,835 1,336 1,503 1,879 2,255 04 MB 6 21,661 0,561 0,935 1,497 1,684 2,105 2,526 05 MA 8 35,441 1,225 2,041 3,266 3,675 4,593 5,512 06 MB 8 38,062 1,315 2,192 3,507 3,946 4,933 5,919 07 MA 10 56,318 2,433 4,054 6,488 7,299 9,124 10,948 08 MB 10 63,074 2,724 4,541 7,266 8,174 10,218 12,262 09 MA 12 81,993 4,250 7,084 11,334 12,752 15,939 19,127 10 MB 12 85,997 4,458 7,430 11,888 13,374 16,718 20,061 11 MA 14 112,523 6,805 11,342 18,147 20,416 25,520 30,624 12 MB 14 122,012 7,379 12,298 19,678 22,138 27,672 33,207 13 MA 16 152,268 10,594 17,656 28,250 31,782 39,727 47,672 14 MB 16 164,311 11,357 18,928 30,286 34,072 42,589 51,107 15 MA 20 240,047 20,740 34,566 55,307 62,220 77,775 93,330 16 MB 20 267,757 23,134 38,557 61,691 69,403 86,753 104,104 TORQUE ADMISSÍVEL [Kgf*m] - SÉRIE MÉTRICA ITEM BITOLA F 0 C 6 TENSÃO ADMISSÍVEL = TENSÃO DE ESCOAMENTO AF CL 4.6 CL 5.8 CL 8.8 CL 9.8 CL 10.8 CL 12.9 01 MA 5 13,614 0,327 0,544 0,871 0,980 1,225 1,470 02 MB 5 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 03 MA 6 19,333 0,557 0,927 1,485 1,670 2,087 2,506 04 MB 6 21,661 0,624 1,038 1,664 1,872 2,338 2,807 05 MA 8 35,441 1,361 2,267 3,629 4,083 5,103 6,124 06 MB 8 38,062 1,462 2,435 3,898 4,385 5,481 6,577 07 MA 10 56,318 2,703 4,505 7,209 8,110 10,137 12,165 08 MB 10 63,074 3,027 5,045 8,073 9,083 11,353 13,624 09 MA 12 81,993 4,723 7,871 12,594 14,168 17,710 21,253 10 MB 12 85,997 4,948 8,255 13,209 14,860 18,575 22,290 11 MA 14 112,523 7,562 12,602 20,164 22,685 28,355 34,027 12 MB 14 122,012 8,199 13,665 21,865 24,598 30,746 36,896 13 MA 16 153,012 11,771 19,618 31,389 35,313 44,141 52,969 14 MB 16 164,311 12,619 21,031 33,651 37,857 47,321 56,786 15 MA 20 240,047 23,045 38,407 61,452 69,134 86,416 103,700 16 MB 20 267,757 25,705 42,841 68,546 77,114 96,392 115,671 TORQUE ADMISSÍVEL [Kgf*m] - SÉRIE MÉTRICA ITEM BITOLA F 0 C 6 TENSÃO ADMISSÍVEL = 80% DA TENSÃO DE RUPTURA T.AD. = 90% DA T.R. AF CL 4.6 CL 5.8 CL 8.8 CL 9.8 CL 10.8 CL 12.9 01 MA 5 13,614 0,436 0,544 0,871 1,103 1,225 1,470 02 MB 5 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 03 MA 6 19,333 0,742 0,927 1,485 1,879 2,088 2,506 04 MB 6 21,661 0,832 1,039 1,664 2,215 2,339 2,807 05 MA 8 35,441 1,815 2,268 3,629 4,593 5,104 6,124 06 MB 8 38,062 1,949 2,435 3,898 4,933 5,481 6,577 07 MA 10 56,318 3,604 4,505 7,209 9,124 10,137 12,165 08 MB 10 63,074 4,037 5,045 8,073 10,218 11,353 13,624 09 MA 12 81,993 6,297 7,871 12,594 15,939 17,710 21,253 10 MB 12 85,997 6,605 8,255 13,209 16,718 18,575 22,290 TORQUE ADMISSÍVEL [Kgf*m] - SÉRIE POLEGADA ITEM BITOLA F 0 C 6 TENSÃO ADMISSÍVEL = 80% DA TENSÃO DE RUPTURA (T.R.) TENSÃO ADM. = 90% DA T. RUPTURA D AF G.1 G.2 G.5 G.7 G.8 01 3/16” UNC 4,725 11,260 0,360 0,446 0,721 0,903 1,017 02 3/16” UNF 4,725 12,817 0,410 0,508 0,820 1,027 1,158 03 1/4” UNC 6,350 20,486 0,874 1,082 1,748 2,189 2,468 04 1/4” UNF 6,350 23,351 0,996 1,234 1,993 2,496 2,813 05 5/16” UNC 7,9375 33,766 1,801 2,230 3,602 4,511 5,085 06 5/16” UNF 7,9375 37,315 1,990 2,464 3,981 4,985 5,619 07 3/8” UNC 9,525 49,943 3,197 3,958 6,394 8,006 9,025 08 3/8” UNF 9,525 56,474 3,615 4,475 7,230 9,053 10,205 09 7/16” UNC 11,1125 68,590 5,122 6,342 10,244 12,828 14,461 10 7/16” UNF 11,1125 76,379 5,704 7,062 11,407 14,285 16,103 11 1/2” UNC 12,7 91,544 7,813 9,673 15,625 19,567 22,057 12 1/2” UNF 12,7 102,937 8,785 10,877 17,579 22,002 24,802 13 1/2” BSW 12,7 88,764 7,575 9,379 15,151 18,973 21,387 14 9/16” UNC 14,2875 117,449 11,277 13,961 22,553 28,242 31,836 15 9/16” UNF 14,2875 130,671 12,546 15,533 25,092 31,421 35,420 16 5/8” UNC 15,875 145,994 15,575 19,283 31,149 39,006 43,971 17 5/8” UNF 15,875 164,786 17,579 21,765 35,159 44,027 49,630 18 3/4” UNC 19,05 215,981 27,649 34,232 55,298 69,246 78,059 19 3/4 UNF 19,05 240,264 30,758 38,081 61,515 77,031 86,835 20 7/8” UNC 17,776 238,4512 44,5064 55,1032 89,0128 111,4641 125,6508 21 7/8” UNF 17,776 262,7088 49,0336 60,7088 98,068 122,8032 138,4335 22 1” UNC 20,32 312,7728 67,5328 82,6216 133,4664 167,1309 188,4015 23 1” UNF 20,32 342,1928 73,0096 90,3936 146,02 182,8512 206,1234 24 1.1/8” UNC 22,856 393,8056 94,5088 117,0104 189,0168 236,6928 266,8176 25 1.1/8” UNF 22,856 441,8056 106,028 131,2728 212,056 265,5432 299,34 26 1.1/4” UNC 25,4 500,128 133,384 165,1424 266,768 334,0557 376,5717 27 1.1/4” UNF 25,4 553,8056 147,7 182,8664 295,4 369,909 416,988 28 1.1/2” UNC 30,48 725,1592 232,0792 287,3368 464,16 581,2353 655,2108 29 1.1/2” UNF 30,48 815,9984 261,152 323,3312 522,304 654,0453 737,2881 TORQUE ADMISSÍVEL [Kgf*m] - SÉRIE POLEGADA ITEM BITOLA TENSÃO ADMISSÍVEL = TENSÃO DE RUPTURA D AF G.1 G.2 G.5 G.7 G.8 01 3/16” UNC 4,725 11,260 0,450 0,558 0,901 1,003 1,130 02 3/16” UNF 4,725 12,817 0,513 0,635 1,025 1,141 1,287 03 1/4” UNC 6,350 20,486 1,093 1,353 2,185 2,433 2,742 04 1/4” UNF 6,350 23,351 1,246 1,542 2,491 2,773 3,126 05 5/16” UNC 7,9375 33,766 2,251 2,787 4,503 5,012 5,650 06 5/16” UNF 7,9375 37,315 2,488 3,080 4,976 5,539 6,244 07 3/8” UNC 9,525 49,943 3,996 4,947 7,992 8,896 10,028 08 3/8” UNF 9,525 56,474 4,518 5,594 9,037 10,059 11,339 09 7/16” UNC 11,1125 68,590 6,403 7,927 12,805 14,253 16,067 10 7/16” UNF 11,1125 76,379 7,130 8,827 14,259 15,872 17,892 11 1/2” UNC 12,7 91,544 9,766 12,487 19,532 21,741 24,508 12 1/2” UNF 12,7 102,937 10,981 13,603 21,963 24,447 27,558 13 1/2” BSW 12,7 88,764 9,469 11,724 18,939 21,081 23,764 14 9/16” UNC 14,2875 117,449 14,096 17,452 28,191 31,380 35,373 15 9/16” UNF 14,2875 130,671 15,682 19,164 31,365 34,912 39,356 16 5/8” UNC 15,875 145,994 19,468 24,104 38,937 43,340 48,856 17 5/8” UNF 15,875 164,786 21,974 27,206 43,948 48,919 55,145 18 3/4” UNC 19,05 215,981 34,561 42,790 69,123 76,340 86,732 19 3/4 UNF 19,05 240,264 38,447 47,601 76,894 85,590 96,484 20 7/8” UNC 22,22 298,064 55,633 68,879 111,266 123,849 139,612 21 7/8” UNF 22,22 328,386 61,292 75,886 122,585 136,448 153,815 22 1” UNC 25,40 390,966 84,416 103,277 166,833 185,701 209,335 23 1” UNF 25,40 427,741 91,262 112,992 182,525 203,168 229,026 24 1.1/8” UNC 28,57 492,257 118,136 146,263 236,271 262,992 296,464 25 1.1/8” UNF 28,57 552,257 132,535 164,091 265,070 295,048 332,600 26 1.1/4” UNC 31,75 625,160 166,730 206,428 333,460 371,173 418,413 27 1.1/4” UNF 31,75 692,257 184,625 228,583 369,250 411,010 463,320 28 1.1/2” UNC 38,10 906,449 290,099 359,171 580,200 645,817 728,012 29 1.1/2” UNF 38,10 1019,998 326,440 404,164 652,880 726,717 819,209