British Standard Brass Thread Chart

Thread Angle 55 Degrees

OD

Decimal

TPI

Pitch

Core Dia

Thread
Depth

Radius

Tapping
Size

MM

Letter
or
NUmber

1/8

0.125

26

0.03846

0.0757

0.0246

0.0053

0.0785

2.0

47

1/4

0.250

26

0.03846

0.2007

0.0246

0.0053

0.2040

5.2

6

3/8

0.375

26

0.03846

0.3257

0.0246

0.0053

0.3320

8.5

Q

1/2

0.500

26

0.03846

0.4507

0.0246

0.0053

0.4531

11.5

29/64

5/8

0.625

26

0.03846

0.5657

0.0246

0.0053

0.5781

14.7

37/64

3/4

0.750

26

0.03846

0.7007

0.0246

0.0053

0.7031

17.86

45/64

7/8

0.875

26

0.03846

0.8257

0.0246

0.0053

0.8281

20.97

53/64

1

1.000

26

0.03846

0.9507

0.0246

0.0053

0.9531

24.2

61/64

1 - 1/8

1.125

26

0.03846

1.0757

0.0246

0.0053

1.0781

27.4

1 - 5/64

1 - 1/4

1.250

26

0.03846

1.2007

0.0246

0.0053

1.2031

30.56

1 - 13/64

1 - 1/2

1.500

26

0.03846

1.4507

0.0246

0.0053

1.4531

36.8

1 - 29/64

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