Jacobs Multi-Craft Duty Chucks - Reference
Jacobs
Model
Michigan Pneumatic
Model
Capacity
Range
Threaded
Mount
Uses
Key
SM1G61-T1 SM1G61-T1 0.028" - 0.250" 3/8"-24 KG1
DC4G61-T1 DC4G61-T1 0.063" - 0.375" 3/8"-24 KG1
SM4G61-T1 SM4G61-T1 0.063" - 0.375" 3/8"-24 KG1
0032116C Discontinued 0.078" - 0.500" 3/8"-24 KK
SM8K61-T1 SM8K61-T1 0.078" - 0.500" 3/8"-24 KK
SM8K64-T1 SM8K64-T1 0.078" - 0.500" 1/2"-20 KK

Thread Mounted Light-Duty Industrial Model
Jacobs
Model
Michigan Pneumatic
Model
Capacity
Range
Threaded
Mount
Uses
Key
20BA-3/8 Discontinued 0.028" - 0.313" 3/8"-24  KG1
22BA-3/8 22BA-0.375 0.063" - 0.375" 3/8"-24  KK
22BA-1/2 22BA-0.500 0.063" - 0.375" 1/2"-20  KK
24BA-3/8 24BA-0.375 0.063" - 0.500" 3/8"-24  KK
26BA-1/2 26BA-0.500 0.063" - 0.500" 1/2"-20 KK


Jacobs Hand-Tite Keyless Chucks - Reference
Jacobs
Model
Michigan Pneumatic
Model
Capacity
Range
Threaded
Mount
31423 31423  Discontinued 0.032" - 0.375" 3/8"-24
31451 31451 0.032" - 0.375" 3/8"-24
31708-3/8 31708-ASM  Discontinued 0.032" - 0.375" 3/8"-24
31967 31967 0.032" - 0.375" 3/8"-24
31993 31993-CLOSEOUT 0.032" - 0.375" 3/8"-24
31708 31708 0.032" - 0.375" 2JT
32000 32000 0.032" - 0.375" 1/2"-20
31377 31377  Discontinued 0.062" - 0.500" 3/8"-24
31731-3/8 31731-ASM 0.062" - 0.500" 3/8"-24
31733 31403A-ASM  Discontinued 0.062" - 0.500" 3/8"-24
31791 31791 0.062" - 0.500" 3/8"-24
32161-3/8 32161-ASM 0.062" - 0.500" 3/8"-24
32540 32540 0.062" - 0.500" 3/8"-24
31403 31403 0.062" - 0.500" 1/2"-20
31693 31693  Discontinued 0.062" - 0.500" 1/2"-20
31731 31731 0.062" - 0.500" 1/2"-20
32161 32161 0.062" - 0.500" 1/2"-20


Jacobs Adapt-A-Drive Chuck - Reference
Jacobs
Model
Michigan Pneumatic
Model
Capacity
Range

Mount
Uses
Key
30248 Discontinued 0.028" - 0.250" 0.250 Hex KG1
30208 Discontinued 0.063" - 0.375" 0.250 Hex KG1


Jacobs Plain Bearing Chucks - Reference

Thread Mounted Medium-Duty Model
Jacobs
Model
Michigan Pneumatic
Model
Capacity
Range
Threaded
Mount
Uses
Key
0B-5/16 0B-0.312 0" - 0.156" 5/16"-24 K0
1BA-3/8 1BA-0.375 0" - 0.250" 3/8"-24 K1
2BA-3/8 2BA-0.375 0" - 0.375" 3/8"-24 K2
31BA-3/8 31BA-0.375 0.063" - 0.375" 3/8"-24 K30
41BA-3/8 41BA-0.375 0" - 0.375" 3/8"-24 K30
41BA-3/8S 41BA-0.375S 0" - 0.375" 3/8"-24 K30
31BA-1/2 31BA-0.500 0.063" - 0.375" 1/2"-20 K30
41BA-1/2 41BA-0.500 0" - 0.375" 1/2"-20 K30
33BA-3/8 33BA-0.375 0.078" - 0.500" 3/8"-24 K32
33BA-1/2 33BA-0.500 0.078" - 0.500" 1/2"-20 K32
33BA-5/8 33BA-0.625 0.078" - 0.500" 5/8"-16 K32

Thread Mounted Heavy-Duty Model
Jacobs
Model
Michigan Pneumatic
Model
Capacity
Range
Threaded
Mount
Uses
Key
7BA-3/8 7BA-0.375 0" - 0.250" 3/8"-24  K7
7BA-1/2 7BA-0.500 0" - 0.250" 1/2"-20 K7
32BA-1/2 32BA-0.500 0" - 0.375" 1/2"-20 K32
34B-5/8 34B-0.625 0" - 0.500" 5/8"-16 K3
34B-45/64 34B-0.703 0" - 0.500" 45/64"-16 K3
3B-5/8 3B-0.625 0.125" - 0.625" 5/8"-16 K3
3B-45/64 3B-0.703 0.125" - 0.625" 45/64"-16 K3
35B-1/2 35B-0.500 0.156" - 0.625" 1/2"-20 K3
36B-5/8 36B-0.625 0.180" - 0.800" 5/8"-16 K4
36B-3/4 36B-0.750 0.180" - 0.800" 3/4"-16 K4
36B-45/64 36B-0.703 0.180" - 0.800" 45/64"-16 K4

Taper Mounted Medium-Duty Model
Jacobs
Model
Michigan Pneumatic
Model
Capacity
Range
Taper
Mount
Uses
Key
0 0 0" - 0.156" 0JT K0
1A 1A 0" - 0.250" 1JT K1
2A 2A 0" - 0.375" 2JT K2
31-01 31-01 0" - 0.375" 1JT K30
31-02 31-02 0" - 0.375" 2JT K30
33 33 0.078" - 0.500" 33JT K32
33KD** 33KD 0.078" - 0.500" 33JT K32

Taper Mounted Heavy-Duty Model
Jacobs
Model
Michigan Pneumatic
Model
Capacity
Range
Taper
Mount
Uses
Key
34-02 34-02 0" - 0.500" 2JT K3
34-06 34-06 0" - 0.500" 6JT K3
34-33 34-33 0" - 0.500" 33JT K3
34-33C* 34-33C 0" - 0.500" 33JT K3C
3A 3A 0.125" - 0.625" 3JT K3
3KD** 3KD 0.125" - 0.625" 3JT K3
3PD*** 3PD 0.125" - 0.625" 3JT K3
36 36 0.180" - 0.800" 3JT K4
36KD** 36KD 0.180" - 0.800" 3JT K4
36PD*** 36PD 0.180" - 0.800" 3JT K4
* Equipped with locking collar 1-1/16"-20 thread.
** Equipped with positive drive slot.
*** Equipped with pin-type positive drive.


Jacobs Ball Bearing Chucks - Reference
Jacobs
Model
Michigan Pneumatic
Model
Capacity
Range
Taper
Mount
Uses
Key
8-1/2N 8-0.500N 0.0001" - 0.250" 2JT K30
11N 11N 0.0001" - 0.375" 2JT K32
14N 14N 0.0001" - 0.500" 3JT K3
16N 16N 0.125" - 0.625" 3JT K4
18N 18N 0.125" - 0.750" 4JT K4
20N 20N 0.375" - 1.000" 5JT K5