Model Engineers Thread Chart

Thread Angle 55 degrees

OD

Decimal

TPI

Pitch

Core Dia

Thread
Depth

Tapping
Size

MM

Letter
or
Number

1/8

0.1250

40

0.02500

0.0930

0.016

0.0938

2.4

3/32

5/32

0.1562

40

0.02500

0.1252

0.016

0.1285

3.25

30

3/16

0.1875

40

0.02500

0.1555

0.016

0.1570

4.0

22

7/32

0.2188

40

0.02500

0.1868

0.016

0.1890

4.8

12

1/4

0.2500

40

0.02500

0.2180

0.016

0.2210

5.6

2

1/4

0.2500

32

0.03125

0.2100

0.020

0.2130

5.5

3

9/32

0.2812

40

0.02500

0.2492

0.016

0.2570

6.6

F

9/32

0.2812

32

0.03125

0.2412

0.020

0.2460

6.3

D

5/16

0.3125

40

0.02500

0.2805

0.016

0.2900

7.4

L

5/16

0.3125

32

0.03125

0.2725

0.020

0.2770

7.1

J

3/8

0.3750

40

0.02500

0.3430

0.016

0.3480

8.9

S

3/8

0.3750

32

0.03125

0.3350

0.020

0.3390

8.6

R

7/16

0.4375

40

0.02500

0.4055

0.016

0.4130

10.5

Z

7/16

0.4375

32

0.03125

0.3975

0.020

0.4040

10.3

Y

1/2

0.5000

40

0.02500

0.4680

0.016

0.4688

12.1

15/32

1/2

0.5000

32

0.03125

0.4600

0.020

0.4688

11.9

15/32

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