BRITISH STANDARD WHITWORTH FORM THREADS THREAD ANGLE 55°BRITISH STANDARD WHITWORTH FORM THREADS BA THREAD ANGLE 47½°BRITISH STANDARD WHITWORTH FORM THREADS BS CY. THREAD ANGLE 60°AMERICAN NATIONAL THREADS THREAD THREAD ANGLE 60°MM (METRIC) THREAD ANGLE 60°

 

Size

Dia

TPI

Dril Size
in mm

0

0.2362

25.4

5.10

1

02087

28.2

4.50

2

0.1850

31.4

4..00

3

0.1614

34.8

3.40

4

0.1417

38.5

3.00

5

0.1260

43.0

2.65

6

0.1102

47.9

2.30

7

0.0984

52.9

2.30

8

0.0866

59.1

1.80

9

0.0748

65.1

1.55

10

0.0669

72.6

1.40

11

0.0591

81.9

1.20

12

0.0512

90.9

1.05

13

0.0472

102.0

0.98

14

0.0394

109.9

0.80

15

0.0354

120.5

0.70

16

0.0311

133.3

0.60

 

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