Jacobs®
Tap Chucks and Die
Grinders Chucks

Tap Chucks
Complete range of flexible collet tap chucks for tapping machines and portable tappers.
Simplify tap changing and provide unmatched accuracy.
Designed for use with the versatile Jacobs® Rubber-Flex®
collet which accepts and precisely centers both decimal and metric
shank diameters
Simple operation one quarter turn of chuck screw
allows nut to disengage back jaws
Tap shank sighting hole presents full view of tap square
during changeovers
Each chuck, with one interchangeable Rubber-Flex® collet,
handles a wide range of tap sizes to speed tap size changes
Positive-drive chuck jaws always locate square of tap shank
to ensure superior performance
Available with choice of Jacobs®, round or square hole
mounts
| Model No. | Tap Capacity | Mount style | Max Capacity | Max Diameter | Round Shank Cap. |
Available Rubber-Flex® collets. Rubber-Flex Collets® are not included. |
weight (oz) | ||||||
| min. | max. | ||||||||||||
| inch | mm | inch | mm | inch | mm | inch | mm | inch | mm | ||||
| JAC.41-01 | #0-1/4 | 1.0-6.35 | 1 JT | 2.0 | 51 | 0.84 | 21 | 0.09 | 2 | 0.25 | 6 | J112, J113, J114 ,J116, J117 | 2 |
| JAC.42-01 | #10-5/16 | 4.83-7.94 | 1 JT | 2.50 | 64 | 1.06 | 27 | 0.09 | 2 | 0.38 | 10 | J420. J421, J 422, J423 | 6 |
| JAC.42-02 | #10-5/16 | 4.83-7.94 | 2 Short JT | 2.50 | 64 | 1.06 | 27 | 0.09 | 2 | 0.38 | 10 | J420. J421, J 422, J423 | 5 |
| JAC.42-24 | #10-5/16 | 4.83-7.94 | .3675 Dia. | 2.50 | 64 | 1.06 | 27 | 0.09 | 2 | 0.38 | 10 | J420. J421, J 422, J423 | 6 |
| JAC.42-J8 | #0-1/4 | 1.00-6.36 | .375 sq hole | 2.50 | 64 | 1.06 | 27 | 0.09 | 2 | 0.38 | 10 | J420. J421, J 422, J423 | 6 |
| JAC.44-02 | 5/16-5/8 | 7.94-15.88 | 2 JT | 3.12 | 79 | 1.47 | 37 | 0.11 | 3 | 0.50 | 13 | J440, J441, J443 | 12 |
| JAC.44-J9 | #10-1/2 | 4.83-12.7 | .500 Sq hole | 3.12 | 79 | 1.47 | 37 | 0.11 | 3 | 0.50 | 13 | J440, J441, J443 | 12 |
| Model No | Nut Part No. | Back Jaws Part No. | Nut Wrench Part No | Body Wrench Part No | Rubber-Flex® collets. |
![]() |
![]() |
![]() |
|||
| JAC.41-01 | JAC.N-410 | JAC.U-410 | JAC.K410N | JAC.K410B | J112, J113, J114 ,J116, J117 |
| JAC.42-01 | JAC.N-420 | JAC.U-420 | JAC.K420N | JAC.K420B | J420. J421, J 422, J423 |
| JAC.42-02 | JAC.N-420 | JAC.U-420 | JAC.K420N | JAC.K420B | J420. J421, J 422, J423 |
| JAC.42-24 | JAC.N-420 | JAC.U-420 | JAC.K420N | JAC.K420B | J420. J421, J 422, J423 |
| JAC.42-J8 | JAC.N-420 | JAC.U-420 | JAC.K420N | JAC.K420B | J420. J421, J 422, J423 |
| JAC.44-02 | JAC.N-440 | JAC.U-440 | JAC.K440N | JAC.K440B | J440, J441, J443 |
| JAC.44-06 | JAC.N-440 | JAC.U-440 | JAC.K440N | JAC.K440B | J440, J441, J443 |
| JAC.44-J9 | JAC.N-440 | JAC.U-440 | JAC.K440N | JAC.K440B | J440, J441, J443 |


| Model No | Capacity Range | Contact | Cone | Outside | No. of inserts | Weight (oz.) | |||||
| Min | Max (A) | Length (B) | Angle (C) | Dia. (D) | |||||||
| (in) | (mm) | (in) | (mm) | (in) | (mm) | (deg) | (in) | (mm) | |||
| JAC.J116 | 0.094 | 2.4 | 0.177 | 4.5 | 0.468 | 11.9 | 26 | 0.590 | 15.1 | 6 | 0 .10 |
| JAC.J117 | 0.177 | 4.5 | 0.256 | 6.5 | 0.468 | 11.9 | 26 | 0.590 | 15.1 | 8 | 0.10 |
| JAC.J420 | 0.176 | 4.5 | 0.320 | 8.1 | 0.500 | 12.7 | 40 | 0.941 | 23.9 | 6 | 0.20 |
| JAC.J421 | 0.139 | 3.5 | 0.257 | 6.5 | 0.500 | 12.7 | 40 | 0.941 | 23.9 | 6 | 0.20 |
| JAC.J422 | 0.253 | 6.4 | 0.383 | 9.7 | 0.500 | 12.7 | 40 | 0.941 | 23.9 | 6 | 0.30 |
| JAC.J423 | 0.090 | 2.3 | 0.180 | 4.6 | 0.500 | 12.7 | 40 | 0.860 | 21.8 | 4 | 0.30 |
| JAC.J440 | 0.280 | 7.1 | 0.500 | 12.7 | 0.630 | 16.0 | 45 | 1.296 | 32.9 | 6 | 0.30 |
| JAC.J441 | 0.176 | 4.5 | 0.383 | 9.7 | 0.630 | 16.0 | 45 | 1.296 | 32.9 | 6 | 0.30 |
| JAC.J443 | 0.110 | 2.5 | 0.280 | 7.1 | 0.620 | 15.7 | 45 | 1.180 | 30.0 | 4 | 0.30 |
DIE GRINDER CHUCKS
Compact tap chuck designed for use with Rubber-Flex® Collets
holds mounted grinding burrs and rotary files on pneumatic and
electric die grinders.
Compact design facilitates use for a wide range of applications
Integral seal protects collet components from abrasives
and swarf
Rubber-Flex® Collets furnished separately for tools
with collect seating cones built into spindles
| Model No | Capacity Range | Mount | Dimensions | weight oz. | ||||||||
| min. | max. | Closed Length | Open Length | Sleeve Dia. (D) | ||||||||
| (in) | (mm) | (in) | (mm) | (in) | (mm) | (in) | (mm) | (in) | (mm) | |||
| JAC.100-61 | 0.09 | 2.3 | 0.25 | 6.4 | 3/8-24 | 1.77 | 45 | 1.88 | 47.8 | 0.75 | 19.1 | 1.5 |
| JAC.N-100 | NUT FOR DIE GRINDER CHUCK 100-61 | |||||||||||

| Model No | Capacity Range | Contact | Cone | Outside | No. of inserts | Weight (oz.) | |||||
| Min | Max (A) | Length (B) | Angle (C) | Dia. (D) | |||||||
| (in) | (mm) | (in) | (mm) | (in) | (mm) | (deg) | (in) | (mm) | |||
| JAC.J116 | 0.094 | 2.4 | 0.177 | 4.5 | 0.468 | 11.9 | 26 | 0.590 | 15.1 | 6 | 0 .10 |
| JAC.J117 | 0.177 | 4.5 | 0.256 | 6.5 | 0.468 | 11.9 | 26 | 0.590 | 15.1 | 8 | 0.10 |



