A-A-51140 Chucks, Drill, Key Type, Three-Jaw, GearedThis commercial item description CID establishes the government acquisition requirements for geared three-jaw drill chucks capable of being adjusted to hold any size straight shank tool within the capacity of the chuck. The jaws of the chuck shall be opened and closed by means of a pinion-type key.

Pages 1 - 2 - 3 - 4 - 5 - 6 - 7

Size code

Capacity range

(inches)

Mount hole end of chuck

Chuck dimensions (inches)

Jacobs taper number

type 1, style B

Nominal diameter (inches) and thread, type 2, style B

Overall length closed

Sleeve diameter

01

0 - 1/4

1

*3/8 x 24

2-7/32

1-19/64

02

0 - 1/4

2 short

1/2 x 20

2-7/32

1-19/64

03

0 - 5/16

2 short

3/8 x 24

2-5/16

1-27/64

04

0 - 5/16

----

1/2 x 20

2-13/32

1-27/64

05

0 - 3/8

2

*1/2 x 20

2-3/4

1-25/32

06

0 - 3/8

----

5/8 x 16

2-3/4

1-25/32

07

0 - 1/2

6

5/8 x 16

3-7/16

2-1/16

08

0 - 1/2

----

45/64 x 16

3-17/32

2-1/16

09

0 - 1/2

----

3/4 x 16

3-17/32

2-1/16

10

1/8 - 5/8

3

5/8 x 16

3-13/16

2-5/16

11

3/16 - 3/4

----

5/8 x 16

3-1/64

2-3/8

12

3/16 - 3/4

3

3/4 x 16

3-57/64

2-3/8

13

1/4 - 13/16

3

----

4-11/32

2-9/16

Size code

Capacity range

(inches)

Jacobs taper number type 1, style C

Chuck dimensions (inches)

Overall length closed

Sleeve diameter

01

0 - 1/4

2 short

2-11/32

1-9/16

02

0 - 3/8

2

2-45/64

1-49/64

03

0 - 1/2

3

3-27/32

2-23/64

04

1/32  -  1/2

3

3-53/64

2-15/64

05

1/8  -  5/8

3

4-5/16

2-5/8

06

1/32  -  5/8

3

3-57/64

2-7/16

07

1/8  -  3/4

4

4-57/64

2-53/64

08

3/16  -  3/4

4

4-41/64

2-51/64

09

3/8  -  1

5

5-1/2

3-21/32

10

3/16  -  1-1/32

5

4-23/32

3-7/64