Tabelas Técnicas: Diāmetro de furos para Roscar



UNF Rosca Unificada Fina
Rosca Fios por pol. Diâmetro do Núcleo Diâmetro da Broca
Limites
Máximo Mínimo
1/8" 44 2,741 2,646 2,7
5/32" 40 3,022 2,921 3,0
nº 8 36 3,606 3,505 3,5
3/16" 32 4,166 4,064 4,1
nº 12 28 4,724 4,623 4,7
1/4" 28 5,588 5,486 5,5
5/16" 24 7,036 6,908 6,9
3/8" 24 8,636 8,510 8,5
7/16" 20 10,033 9,880 9,9
1/2" 20 11,607 11,480 11,5
9/16" 18 13,081 12,930 12,9
5/8" 18 14,681 14,530 14,5
3/4" 16 17,678 17,500 17,5
7/8" 14 20,675 20,472 20,25
1" 12 23,571 23,342 23,25
1,1/8" 12 26,746 26,517 26,5
1,1/4" 12 29,921 29,692 29,5
1,3/8" 12 33,096 32,687 32,5
1,1/2 12 36,271 36,042 36,0


UNC Rosca unificada Grossa
Rosca Fios por pol. Diâmetro do Núcleo Diâmetro da Broca
Limites
Máximo Mínimo
1/8" 40 2,697 2,593 2,6
5/32" 32 2,895 2,768 2,85
nº 8 32 3,530 3,403 3,5
3/16" 24 3,962 3,810 3,9
nº 12 24 4,597 4,470 4,5
1/4" 20 5,254 5,130 5,2
5/16" 18 6,731 6,578 6,6
3/8" 16 8,153 7,975 8,0
7/16" 14 9,550 9,347 9,4
1/2" 13 10,871 10,515 10,8
9/16" 12 12,446 12,090 12,2
5/8" 11 13,868 13,614 13,5
3/4" 10 16,840 16,586 16,5
7/8" 9 19,761 19,481 19,5
1" 8 22,606 22,301 22,25
1,1/8" 7 25,350 24,993 25,0
1,1/4" 7 28,524 28,168 28,25
1,3/8" 6 31,115 30,734 30,75
1,1/2" 6 34,300 33,910 34,0
1,3/4" 5 39,827 39,395 39,5
2" 4,1/2 45,593 45,136 45,0
2,1/4" 4,1/2 51,943 51,485 51,5
2,1/2" 4 57,581 57,099 57,25
2,3/4" 4 63,931 63,450 63,5
3" 4 70,281 69,800 70,0