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ANSI B94.11 twist drill bits

twist drill bits ANSI B94.11

Short twist drills, jobber length, straight shank, fractional sizes (ANSI B94.11) HSS

Nominal diameter
Dh8
mm

Overall length
L
inch

Flute length
l
inch

Number

0.343

13/16

3/16

80

0.368

13/16

3/16

79

0.406

13/16

3/16

78

0.457

13/16

3/16

77

0.508

13/16

3/16

76

0.533

13/16

3/16

75

0.572

13/16

3/16

74

0.610

13/16

3/16

73

0.635

13/16

3/16

72

0.660

13/16

3/16

71

0.711

13/16

3/16

70

0.742

13/16

3/16

69

0.787

13/16

3/16

68

0.813

1 3/16

13/32

67

0.838

1 3/16

13/32

66

0.889

1 3/16

13/32

65

0.914

1 3/16

13/32

64

0.940

1 3/16

13/32

63

0.965

1 3/16

13/32

62

0.991

1 3/16

13/32

61

1.016

1 3/16

13/32

60

1.041

1 3/16

13/32

59

1.067

1 3/16

13/32

58

1.092

1 3/16

13/32

57

1.181

1 3/16

13/32

56

1.321

1 1/2

5/8

55

1.397

1 1/2

5/8

54

1.511

1 1/2

5/8

53

1.613

1 11/16

25/32

52

1.702

1 11/16

25/32

51

1.778

1 11/16

25/32

50

1.854

1 11/16

25/32

49

1.930

1 11/16

25/32

48

1.994

1 15/16

15/16

47

2.057

1 15/16

15/16

46

2.083

1 15/16

15/16

45

2.184

1 15/16

15/16

44

2.261

1 15/16

15/16

43

2.375

1 15/16

15/16

42

2.438

2 1/4

1 3/16

41

2.489

2 1/4

1 3/16

40

2.527

2 1/4

1 3/16

39

2.542

2 1/4

1 3/16

38

2.578

2 1/4

1 3/16

37

2.705

2 1/4

1 3/16

36

2.794

2 13/32

1 5/16

35

2.819

2 13/32

1 5/16

34

2.870

2 13/32

1 5/16

33

2.946

2 13/32

1 5/16

32

3.048

2 13/32

1 5/16

31

3.284

2 9/16

1 7/16

30

3.454

2 9/16

1 7/16

29

3.569

2 9/16

1 7/16

28

3.658

2 3/4

1 17/32

27

3.734

2 3/4

1 17/32

26

3.797

2 3/4

1 17/32

25

3.861

2 3/4

1 17/32

24

3.912

2 3/4

1 17/32

23

3.988

2 15/16

1 11/16

22

4.039

2 15/16

1 11/16

21

4.089

2 15/16

1 11/16

20

4.216

2 15/16

1 11/16

19

4.305

2 15/16

1 11/16

18

4.394

3 5/32

1 27/32

17

4.496

3 5/32

1 27/32

16

4.572

3 5/32

1 27/32

15

4.623

3 5/32

1 27/32

14

4.699

3 5/32

1 27/32

13

4.801

3 3/8

2 1/16

12

4.851

3 3/8

2 1/16

11

4.915

3 3/8

2 1/16

10

4.978

3 3/8

2 1/16

9

5.055

3 3/8

2 1/16

8

5.105

3 3/8

2 1/16

7

5.182

3 3/8

2 1/16

6

5.220

3 3/8

2 1/16

5

5.309

3 3/8

2 1/16

4

5.410

3 3/8

2 1/16

3

5.613

3 21/32

2 1/4

2

5.791

3 21/32

2 1/4

1

5.944

3 21/32

2 1/4

A

6.045

3 21/32

2 1/4

B

6.147

3 21/32

2 1/4

C

6.248

3 21/32

2 1/4

D

6.350

3 31/32

2 1/2

E

6.528

3 31/32

2 1/2

F

6.629

3 31/32

2 1/2

G

6.756

4 9/32

2 23/32

H

6.909

4 9/32

2 23/32

7.036

4 9/32

2 23/32

J

7.137

4 9/32

2 23/32

K

7.366

4 9/32

2 23/32

L

7.493

4 9/32

2 23/32

M

7.671

4 19/32

2 15/16

N

8.026

4 19/32

2 15/16

O

8.204

4 19/32

2 15/16

P

8.433

4 19/32

2 15/16

Q

8.611

4 19/32

2 15/16

R

8.839

4 19/32

2 15/16

S

9.093

4 19/32

2 15/16

T

9.347

4 19/32

2 15/16

U

9.576

5 1/4

3 7/16

V

9.804

5 1/4

3 7/16

W

10.084

5 1/4

3 7/16

X

10.282

5 1/4

3 7/16

Y

10.490

5 1/4

3 7/16

Z



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