Inch sized fasteners and more

NPT Pipe thread ANSI B 1.20.1

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