Page 268 - Fanar

i Technical Information

10.1. Thread Hole Preparatory Diameters

Unifi ed Threads

P
60°
D D 1
UNC Unified coarse thread ANSI/ASME B1.1 UNFUnified coarse thread ANSI/ASME B1.1

Nom. size D 1 (2B) Nom. size D (2B)
1
D - Gg/1" min. max. D - Gg/1" min. max.
inch (tpi) mm mm mm inch (tpi) mm mm mm
Nr. 1 - 64 1,425 1,582 1,55 Nr. 2 - 64 1,755 1,913 1,85
Nr. 2 - 56 1,694 1,872 1,85 Nr. 3 - 56 2,024 2,197 2,15
Nr. 3 - 48 1,941 2,146 2,1 Nr. 4 - 48 2,271 2,459 2,4
Nr. 4 - 40 2,156 2,385 2,35 Nr. 5 - 44 2,550 2,741 2,7
Nr. 5 - 40 2,487 2,697 2,65 Nr. 6 - 40 2,817 3,012 2,95
Nr. 6 - 32 2,647 2,896 2,85 Nr. 8 - 36 3,401 3,597 3,5
Nr. 8 - 32 3,307 3,528 3,5 Nr. 10 - 32 3,967 4,168 4,1
Nr. 10 - 24 3,680 3,949 3,9 Nr. 12 - 28 4,503 4,716 4,6
Nr. 12 - 24 4,341 4,590 4,5 1 /4 - 28 5,367 5,580 5,5
1 /4 - 20 4,976 5,268 5,1 5 /16 - 24 6,792 7,038 6,9
5 /16 - 18 6,411 6,734 6,6 3 /8 - 24 8,379 8,626 8,5
3 /8 - 16 7,805 8,164 8 7 /16 - 20 9,738 10,030 9,9
7 /16 - 14 9,149 9,550 9,4 1 /2 - 20 11,326 11,618 11,5
1 /2 - 13 10,584 11,016 10,8 9 /16 - 18 12,761 13,084 12,9
9 /16 - 12 11,996 12,456 12,2 5 /8 - 18 14,348 14,671 14,5
5 /8 - 11 13,376 13,868 13,5 3 /4 - 16 17,330 17,689 17,5
3 /4 - 10 16,299 16,833 16,5 7 /8 - 14 20,262 20,663 20,4
7 /8 - 9 19,169 19,748 19,5 1" - 12 23,109 23,569 23,25
1" - 8 21,963 22,598 22,25 1 /8 - 12 26,284 26,744 26,5
1
1
1
1 /8 - 7 24,648 25,349 25 1 /4 - 12 29,459 29,919 29,5
3
1
1 /4 - 7 27,823 28,524 28 1 /8 - 12 32,634 33,094 32,75

3
1
1 /8 - 6 30,343 31,120 30,75 1 /2 - 12 35,809 36,269 36

1
1 /2 - 6 33,518 34,295 34

3

1 /4 - 5 38,951 39,814 39,5

2" - 4 /2 44,689 45,598 45
1

UN-8 UNEF

D 1 (2B)
D 1 (2B) Nom. size
Nom. size

- Gg/1" min. max.
D - Gg/1" min. max. D
inch (tpi) mm mm mm inch (tpi) mm mm mm
1 /4 - 32 5,491 5,679 5,55
1
1 /8 - 8 25,138 25,773 25,4
1
1 /4 - 8 28,313 28,948 28,6 5 /16 - 32 7,079 7,267 7,15
1
1 /2 - 8 34,663 35,298 35 3 /8 - 32 8,666 8,854 8,7
7
3
1 /4 - 8 41,013 41,648 41,3 /16 - 28 10,130 10,343 10,2
1 /2 - 28 11,717 11,930 11,8
2" - 8 47,363 47,998 47,7
9 /16 - 24 13,142 13,388 13,2
5 /8 - 24 14,729 14,975 14,8
3 /4 - 20 17,676 17,968 17,8
11 7 1" - - 20 20,851 21,143 20,95
/8
24,15
24,026 24,318
20
264