Combined Countersink and Drill Chart

Centerdrill Dimensions - Standard Type  

(scroll down for Bell Type) 

Size

Body Dia (A)

Drill Dia (D)

Drill Length (C)

OAL (L)

00

1/8

0.025

0.030

1 1/8

0

1/8

1/32

0.038

1 1/8

1

1/8

3/64

3/64

1 1/4

2

3/16

5/64

5/64

1 7/8

3

1/4

7/64

7/64

2

4

5/16

1/8

1/8

2 1/8

5

7/16

3/16

3/16

2 3/4

6

1/2

7/32

7/32

3

7

5/8

1/4

1/4

3 1/4

8

3/4

5/16

5/16

3 1/2

Bell Type

Size

Body Dia (A)

Drill Dia (D)

Bell Dia (E)

Drill Length (C)

OAL (L)

11

1/8

3/64

0.1

3/64

1 1/4

12

3/16

1/16

0.15

1/16

1 7/8

13

1/4

3/32

0.2

3/32

2

14

5/16

7/64

0.25

7/64

2 1/8

15

7/16

5/32

0.35

5/32

2 3/4

16

1/2

3/16

0.4

3/16

3

17

5/8

7/32

0.5

7/32

3 1/4

18

3/4

1/4

0.6

1/4

3 1/2