Porca e Contra-Porca Sextavada: Normal / Leve / Regular
REFERÊNCIA ASME / ANSI B18.2.2 - 1987 (Tabela 3)
| Diâmetro | F | G | H | H1 | ||||
| Nominal | máx. | min. | máx. | min. | máx. | min. | máx. | min. |
| 1/4" | 11,125 | 10,871 | 12,827 | 12,395 | 5,740 | 5,384 | 4,140 | 3,810 |
| 5/16" | 12,700 | 12,420 | 14,655 | 14,147 | 6,934 | 6,553 | 4,953 | 4,572 |
| 3/8" | 14,274 | 13,995 | 16,510 | 15,951 | 8,559 | 8,128 | 5,765 | 5,334 |
| 7/16" | 17,475 | 17,145 | 20,167 | 19,507 | 9,779 | 9,271 | 6,604 | 6,096 |
| 1/2" | 19,050 | 18,694 | 21,996 | 21,336 | 11,379 | 10,845 | 8,204 | 7,670 |
| 9/16" | 22,225 | 21,869 | 25,654 | 24,942 | 12,598 | 12,014 | 8,229 | 7,645 |
| 5/8" | 23,825 | 23,418 | 27,508 | 26,695 | 14,198 | 13,589 | 9,829 | 9,220 |
| 3/4" | 28,575 | 27,635 | 32,994 | 31,496 | 16,891 | 15,671 | 11,328 | 10,109 |
| 7/8" | 33,324 | 32,232 | 38,506 | 36,753 | 19,710 | 18,389 | 12,954 | 11,633 |
| 1" | 38,100 | 36,830 | 43,992 | 41,986 | 22,529 | 21,107 | 14,605 | 13,182 |
| 1.1/8" | 42,875 | 41,427 | 49,504 | 47,218 | 25,374 | 23,850 | 16,230 | 14,706 |
| 1.1/4" | 47,625 | 46,024 | 54,991 | 52,476 | 27,787 | 26,162 | 19,075 | 17,449 |
| 1.3/8" | 52.374 | 50,647 | 60,502 | 57,734 | 30,632 | 28,905 | 20,701 | 18,973 |
| 1.1/2" | 57,150 | 55,245 | 65,989 | 62,992 | 33,451 | 31,623 | 22,352 | 20,523 |