Inch sized fasteners and more
Table for NPT pipe thread ANSI B 1.20.1
⌀
Threads per Inch
pilot holeØ mm
Millimeter
Inch Decimal
1/8
27
8,50
10,287
0,405
1/4
18
11,00
13,716
0,540
3/8
18
14,50
17,145
0,675
1/2
14
18,00
21,336
0,840
3/4
14
23,00
26,670
1,050
1
11.1/2
29,00
33,401
1,315
1.1/4
11.1/2
38,00
42,164
1,660
1.1/2
11.1/2
44,00
48,260
1,900
2
11.1/2
56,00
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