Jacobs® Drill Chucks

Ball Bearing Super Chucks Plain Bearing Chucks

Ball Bearing Super Chucks

Designed for close tolerance, production drilling on precision equipment

The Jacobs Ball Bearing Super Chuck is specifically engineered for heavy-duty, close tolerance production drilling. It is adaptable to a wide range of production drilling equipment, jig borers, milling machines, lathes and radials. Utilizing a ball thrust bearing to reduce friction in the chuck closing mechanism, it permits the application of more gripping force on drill shanks to maximize drilling torque under the most demanding machining conditions.

Features

Ball bearing construction maximizes gripping force and drilling accuracy.
Jaws center-ground for absolute straightness and alignment.
Jaws specially treated to ensure extended thread life and high gripping surface hardness.
One-piece sleeve eliminates crack between driving teeth often found in other designs.
Through-hardened sleeve teeth plus hardened nose and keyholes provide outstanding wear resistance.
Fluted sleeve standard.
Each chuck 100% inspected for performance and precision.

Ball Bearing Super Chucks
Model Part # Capacity Range Mount
Jacobs Key
No.

Minimum Maximum

in mm in mm

8-1/2N 8-1/2N 0 * 0 * 0.250 6.4 2JT K30

11N 11N 0 * 0 * 0.375 10 2JT K32

14N 14N 0 * 0 * 0.500 13 3JT K3

16N 16N 0.125 3 0.625 16 3JT K4

18N 18N 0.125 3 0.750 19 4JT K4

20N 20N 0.375 10 1.00 25.4 5JT K5

* The 0 minimum capacity will hold a No.70 ( .028"/.711 mm) drill.

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**Ball Bearing Super Chucks**
Model	Part #	Capacity Range	Mount Jacobs	Key No.
Minimum	Maximum
in	mm	in	mm
8-1/2N	8-1/2N	0 *	0 *	0.250	6.4	2JT	K30
11N	11N	0 *	0 *	0.375	10	2JT	K32
14N	14N	0 *	0 *	0.500	13	3JT	K3
16N	16N	0.125	3	0.625	16	3JT	K4
18N	18N	0.125	3	0.750	19	4JT	K4
20N	20N	0.375	10	1.00	25.4	5JT	K5

Plain Bearing Chucks

The O.E.M. standard for accuracy and durability on all types of industrial power and machine tools

The Jacobs Plain Bearing Chuck is the world's most widely used for medium or heavy-duty portable, bench or floor mounted power tools. This industrial quality chuck, with fully hardened and ground working components, offers exceptionally high accuracy, gripping power and durability. Both heavy and medium duty models are available in a wide range of capacities for use on threaded mounts and taper mounted spindles

Features

Heavy and Medium Duty models for threaded or taper mounting.
Jaws center-ground for absolute straightness and alignment.
Jaws specially treated to ensure extended thread life and high gripping surface hardness.
One-piece sleeve eliminates crack between driving teeth often found in other designs.
Through-hardened sleeve teeth plus hardened nose and keyholes provide outstanding wear resistance.
Fluted sleeve standard.
Each chuck 100% inspected for performance and precision.

Taper Mounted Heavy Duty Models
Model Part # Capacity Range Mount
Jacobs Key
No.

Minimum Maximum

in mm in mm

3A 3A 0.125 3 0.625 16 3JT K3

3KD (2) 3KD 0.125 3 0.625 16 3JT K3

3PD (3) 3PD 0.125 3 0.625 16 3JT K3

34-02 34-02 0 (1) 0 0.500 13 2JT K3

34-06 34-06 0 (1) 0 0.500 13 6JT K3

34-33 34-33 0 (1) 0 0.500 13 33JT K3

34-33C (4) 34-33C 0 (1) 0 0.500 13 33JT K3C

36 36 0.180 5 0.800 20.3 3JT K4

36KD (2) 36KD 0.180 5 0.800 20.3 3JT K4

36PD (3) 36PD 0.180 5 0.800 20.3 3JT K4

(1) Minimum capacity will hold a No.70 ( .028"/.711 mm) drill.
(2) Equipped with positive drive slot.
(3) Equipped with pin-type positive drive.
(4) Equipped with locking collar.

Taper Mounted Medium Duty Models
Model Part # Capacity Range Mount
Jacobs Key
No.

Minimum Maximum

in mm in mm

0 0 0 (1) 0 0.156 4 0JT K0

1A 1A 0 (1) 0 0.250 6.5 1JT K1

2A 2A 0 (1) 0 0.375 10 2JT K2

31-01 31-01 0 (1) 0 0.375 10 1JT K30

31-02 31-02 0 (1) 0 0.375 10 2JT K30

33 33 0.08 2 0.500 13 33JT K32

3326A (4) 3326A 0.08 2 0.500 13 33JT K32

33KD (3) 33KD 0.08 2 0.500 13 33JT K32

(1) Minimum capacity will hold a No.70 ( .028"/.711 mm) drill.
(2) Equipped with positive drive slot.
(3) Equipped with pin-type positive drive.
(4) Equipped with locking collar.

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Thread Mounted Heavy Duty Models
Model Part # Capacity Range Mount Thread
Jacobs Key
No.

Minimum Maximum

in mm in mm

3B 5/8 3B 5/8 0.125 3 0.625 16 5/8-16 K3

7BA 3/8 7BA 3/8 0 (1) 0 0.250 6.5 3/8-24 K7

32BA 1/2 32BA 1/2 0 (1) 0 0.375 10 1/2-20 K32

35B 1/2 35B 1/2 0.156 4 0.625 16 1/2-20 K3

36B 3/4 36B 3/4 0.188 5 0.800 20.3 3/4-16 K4

36B 5/8 36B 5/8 0.188 5 0.800 20.3 5/8-16 K4

(1) Minimum capacity will hold a No.70 ( .028"/.711 mm) drill.

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Thread Mounted Medium Duty Models
Model Part # Capacity Range Mount Thread
Jacobs Key
No.

Minimum Maximum

in mm in mm

0B 5/16 0B 5/16 0 (2) 0 0.156 4 5/16-24 K0

1B 3/8 1B 3/8 0 (1) 0 0.250 6.5 3/8-24 K1

2BA 3/8 2BA 3/8 0 (1) 0 0.375 10 3/8-24 K2

31BA 1/2 31BA 1/2 0 (1) 0 0.375 10 1/2-20 K30

31BA 3/8-S 31BA 3/8-S 0 (1) 0 0.375 10 3/8-24 K30

31BA 3/8-F 31BA 3/8-F 0 (1) 0 0.375 10 3/8-24 K30

33BA 1/2 33BA 1/2 0.08 2 0.500 13 1/2-20 K32

33BA 3/8 33BA 3/8 0.08 2 0.500 13 3/8-24 K32

33BA 5/8-16 33BA 5/8-16 0.08 2 0.500 13 5/8-16 K32

(1) Minimum capacity will hold a No.70 ( .028"/.711 mm) drill.
(2) Model 0B 5/16 has a minimum capacity of a No. 80 (.0135in/.344mm) drill

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**Taper Mounted Heavy Duty Models**
Model	Part #	Capacity Range	Mount Jacobs	Key No.
Minimum	Maximum
in	mm	in	mm
3A	3A	0.125	3	0.625	16	3JT	K3
3KD (2)	3KD	0.125	3	0.625	16	3JT	K3
3PD (3)	3PD	0.125	3	0.625	16	3JT	K3

34-02	34-02	0 (1)	0	0.500	13	2JT	K3
34-06	34-06	0 (1)	0	0.500	13	6JT	K3
34-33	34-33	0 (1)	0	0.500	13	33JT	K3
34-33C (4)	34-33C	0 (1)	0	0.500	13	33JT	K3C

36	36	0.180	5	0.800	20.3	3JT	K4
36KD (2)	36KD	0.180	5	0.800	20.3	3JT	K4
36PD (3)	36PD	0.180	5	0.800	20.3	3JT	K4

**Taper Mounted Medium Duty Models**
Model	Part #	Capacity Range	Mount Jacobs	Key No.
Minimum	Maximum
in	mm	in	mm
0	0	0 (1)	0	0.156	4	0JT	K0
1A	1A	0 (1)	0	0.250	6.5	1JT	K1
2A	2A	0 (1)	0	0.375	10	2JT	K2
31-01	31-01	0 (1)	0	0.375	10	1JT	K30
31-02	31-02	0 (1)	0	0.375	10	2JT	K30

33	33	0.08	2	0.500	13	33JT	K32
3326A (4)	3326A	0.08	2	0.500	13	33JT	K32
33KD (3)	33KD	0.08	2	0.500	13	33JT	K32

**Thread Mounted Heavy Duty Models**
Model	Part #	Capacity Range	Mount Thread Jacobs	Key No.
Minimum	Maximum
in	mm	in	mm
3B 5/8	3B 5/8	0.125	3	0.625	16	5/8-16	K3
7BA 3/8	7BA 3/8	0 (1)	0	0.250	6.5	3/8-24	K7
32BA 1/2	32BA 1/2	0 (1)	0	0.375	10	1/2-20	K32

35B 1/2	35B 1/2	0.156	4	0.625	16	1/2-20	K3
36B 3/4	36B 3/4	0.188	5	0.800	20.3	3/4-16	K4
36B 5/8	36B 5/8	0.188	5	0.800	20.3	5/8-16	K4

**Thread Mounted Medium Duty Models**
Model	Part #	Capacity Range	Mount Thread Jacobs	Key No.
Minimum	Maximum
in	mm	in	mm
0B 5/16	0B 5/16	0 (2)	0	0.156	4	5/16-24	K0
1B 3/8	1B 3/8	0 (1)	0	0.250	6.5	3/8-24	K1
2BA 3/8	2BA 3/8	0 (1)	0	0.375	10	3/8-24	K2

31BA 1/2	31BA 1/2	0 (1)	0	0.375	10	1/2-20	K30
31BA 3/8-S	31BA 3/8-S	0 (1)	0	0.375	10	3/8-24	K30
31BA 3/8-F	31BA 3/8-F	0 (1)	0	0.375	10	3/8-24	K30

33BA 1/2	33BA 1/2	0.08	2	0.500	13	1/2-20	K32
33BA 3/8	33BA 3/8	0.08	2	0.500	13	3/8-24	K32
33BA 5/8-16	33BA 5/8-16	0.08	2	0.500	13	5/8-16	K32

GNT