Inch sized fasteners and more
Table for Whitworth pipe thread
⌀
Threads per Inch
pilot holeØ mm
Millimeter
Inch Decimal
1/8
28
8,80
9,73
0,3831
1/4
19
11,80
13,16
0,5181
3/8
19
15,25
16,66
0,6559
1/2
14
19,00
20,96
0,8252
5/8
14
21,00
22,91
0,9020
7/8
14
28,25
30,20
1,1890
3/4
14
24,50
26,44
1,0409
1
11
30,75
33,25
1,3091
1.1/8
11
35,50
37,90
1,4921
1.3/8
11
42,00
44,32
1,7449
1.1/2
11
45,50
47,80
1,8819
1.3/4
11
51,40
53,75
2,1610
1.1/4
11
39,50
41,91
1,6500
2
11
57,20
59,62
2,3472
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