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info@comptrolinc.com  216-587-5200

Ballnuts

Comptrol preloaded and non-preloaded ballnut assemblies are available in over 200 models in:
Base, Flange, Cut-off Flange, or Trunnion mounting configurations to accommodate a wide range of rolled thread and precision ground ballscrews.

Custom mounting configurations are also available to meet your design requirements.

ballnut base mountBase Mount

ballnut flangeFlange Mount

ballnut cutoff flangeCut-Off Flange Mount

ballnut trunnionTrunnion Mount

Please click on a title below for further information and Mounting Configuration.

Preloaded Ballnut Assemblies

Preloaded Ballnut Assemblies

Comptrol preloaded ballnuts offer:

  • Performance normally expected from a precision ground screw
  • A substantially lower price

The unique design of Comptrol's preloaded double nut assemblies allows the load to be attached to the center of the assembly. Centering the load between two opposing preloaded ballnuts eliminates backlash resulting in truer bi-directional positioning accuracy and repeatability, a more uniform preload, and low friction drag for optimum power transmission efficiency. The factory set preload adapter allows the preload to be set at up to 30% of the applied load for the selected ballscrew. Once set, the preload remains constant throughout the life of the screw.

Preloaded Ballnut Assemblies

Mounting Configuration

Ballscrew Ø (in)FlangeCut-Off FlangeBaseTrunion
0.625 65-1-204 65-1-304 65-1-404 65-1-504
  65-1-205 65-1-305 65-1-405 65-1-505
0.750 65-1-206 65-1-306 65-1-406 65-1-506
  65-1-207 65-1-307 65-1-407 65-1-507
1.000 65-1-208 65-1-308 65-1-408 65-1-508
  65-1-209 65-1-309 65-1-409 65-1-509
  65-1-210 65-1-310 65-1-410 65-1-510
  65-1-211 65-1-311 65-1-411 65-1-511
  65-1-212 65-1-312 65-1-412 65-1-512
1.1500 65-1-213 65-1-313 65-1-413 65-1-513
1.500 65-1-214 65-1-314 65-1-414 65-1-514
  65-1-215 65-1-315 65-1-415 65-1-515
  65-1-216 65-1-316 65-1-416 65-1-516
  65-1-226 65-1-326 65-1-426 65-1-526
2.000 65-1-217 65-1-317 65-1-417 65-1-517
  65-1-218 65-1-318 65-1-418 65-1-518
  65-1-219 65-1-319 65-1-419 65-1-519
2.250 65-1-220 65-1-320 65-1-420 65-1-520
2.500 65-1-221 65-1-321 65-1-421 65-1-521
  65-1-222 65-1-322 65-1-422 65-1-522
3.000 65-1-223 65-1-323 65-1-423 65-1-523

Non Pre-loaded Ballnut Assemblies

Non-Preloaded Ballnuts

Comptrol non-preloaded ballnuts offer a definite advantage over other methods of converting rotary motion to linear motion.

  • Operating at 90% mechanical efficiency
  • The smooth rolling contact between the bearing balls and the ballscrew and nut assembly makes it possible to move heavy loads in small increments as low as .0001"
  • Often less power is required using conventional screws, pneumatics, or hydraulics

Comptrol non-preloaded nut assemblies are ideal for applications where the applied load is always in one direction. In these types of applications, the bearing balls always ride on one side of the ball groove minimizing the effects of backlash on positioning accuracy and repeatability. However, in positioning load applications where accuracy and repeatability must be considered, a Comptrol preloaded nut assembly is recommended.

Mounting Configuration

Ballscrew Ø (in)FlangeCut-Off FlangeBaseTrunion
0.625 65-0-204 65-0-304 65-0-404 65-0-504
  65-0-205 65-0-305 65-0-405 65-0-505
0.750 65-0-206 65-0-306 65-0-406 65-0-506
  65-0-207 65-0-307 65-0-407 65-0-507
1.000 65-0-208 65-0-308 65-0-408 65-0-508
  65-0-209 65-0-309 65-0-409 65-0-509
  65-0-210 65-0-310 65-0-410 65-0-510
  65-0-211 65-0-311 65-0-411 65-0-511
  65-0-212 65-0-312 65-0-412 65-0-512
1.1500 65-0-213 65-0-313 65-0-413 65-0-513
1.500 65-0-214 65-0-314 65-0-414 65-0-514
  65-0-215 65-0-315 65-0-415 65-0-515
  65-0-216 65-0-316 65-0-416 65-0-516
  65-0-226 65-0-326 65-0-426 65-0-526
2.000 65-0-217 65-0-317 65-0-417 65-0-517
  65-0-218 65-0-318 65-0-418 65-0-518
  65-0-219 65-0-319 65-0-419 65-0-519
2.250/td> 65-0-220 65-0-320 65-0-420 65-0-520
2.500 65-0-221 65-0-321 65-0-421 65-0-521
  65-0-222 65-0-322 65-0-422 65-0-522
3.000/td> 65-0-223 65-0-323 65-0-423 65-0-523