Inverted Anti-Backlash Features

Inverted Anti-backlash Translating Machine Screw Jacks - 1/4 Ton to 50 Ton

Anti-backlash Machine Screw Jacks are used wherever reversible load conditions require precision positioning control. Adjustable backlash Machine Screw Jack models are available to reduce backlash to approximately 0.003".

An Anti-backlash Machine Screw Jack allows the lash between the drive sleeve thread and the lifting screw thread to be controlled by adjusting the top cover of the jack. The anti-backlash jack design has an upper drive sleeve and a lower drive sleeve. Adjustment of the cover changes the relative distance between the drive sleeves. This change in distance compensates for any lash. Because the drive sleeve is split, the life of an Anti-backlash Machine Screw Jack will be less.

Anti-backlash Machine Screw Jacks minimize backlash, but should not be used to completely eliminate backlash. While it may be desirable to totally eliminate backlash, the result would be a lock-up of lifting shaft and drive sleeve.

Depending on size, Inverted Anti-backlash Translating designs are available with optional accessories such as boots, motor mounts, right-angle reducers, motors, encoders and rotary limit switches.

Please choose from the following Inverted Anti-Backlash categories

Please select a product below to proceed.

Details Performance Specifications
Product Capacity [Ton] Gear Ratio Turns of Worm Per Inch Travel Torque to Raise 1 lb. [in-lb] Lifting Screw Diameter [in] Screw Lead [in] Maximum Allowable Input [hp] Maximum Input Torque [in-lb] Maximum Worm Speed at Rated Load [rpm] Maximum Load at 1750 RPM [lb]
ActionJac MJAB-20-I 5:1
  0.5 5:1 20 0.0190 0.50 0.250 0.33 19.3 1090 600
ActionJac MJAB-25-I 5:1
  0.5 5:1 25 0.0210 0.63 0.200 0.33 20.7 1040 560
ActionJac MJAB-40-I 5:1
  0.5 5:1 40 0.0170 0.63 0.125 0.33 16.7 1260 700
ActionJac MJAB-50-I 5:1
  0.5 5:1 50 0.0140 0.50 0.100 0.33 13.5 1560 860
ActionJac MJAB-80-I 20:1
  0.5 20:1 80 0.0080 0.50 0.250 0.17 8 1310 720
ActionJac MJAB-100-I 20:1
  0.5 20:1 100 0.0090 0.63 0.200 0.17 8.7 1210 670
ActionJac MJAB-160-I 20:1
  0.5 20:1 160 0.0070 0.63 0.125 0.17 7 1500 830
ActionJac MJAB-200-I 20:1
  0.5 20:1 200 0.0060 0.50 0.100 0.17 5.7 1800 1000
ActionJac 1AB-MSJ-I 5:1
  1 5:1 25 0.0225 0.75 0.200 0.50 45 700 800
ActionJac 1AB-MSJ-I 20:1
  1 20:1 100 0.0105 0.75 0.200 0.25 21 750 857
ActionJac 2AB-MSJ-I 6:1
  2 6:1 24 0.0250 1.00 0.250 2.00 100 1260 2881
ActionJac 2AB-MSJ-I 12:1
  2 12:1 48 0.0154 1.00 0.250 1.50 62 1525 3486
ActionJac 2AB-MSJ-I 24:1
  2 24:1 96 0.0105 1.00 0.250 0.50 42 750 1715
ActionJac 2RAB-MSJ-I 6:1
  2 6:1 24 0.0250 1.00 0.250 2.00 100 1260 2881
ActionJac 2RAB-MSJ-I 12:1
  2 12:1 48 0.0154 1.00 0.250 1.50 62 1525 3486
ActionJac 2RAB-MSJ-I 24:1
  2 24:1 96 0.0105 1.00 0.250 0.50 42 750 1715
ActionJac 2.5AB-MSJ-I 6:1
  2.5 6:1 24 0.0252 1.00 0.250 2.00 126 1000 2858
ActionJac 2.5AB-MSJ-I 12:1
  2.5 12:1 48 0.0148 1.00 0.250 1.50 74 1277 3650
ActionJac 2.5AB-MSJ-I 24:1
  2.5 24:1 96 0.0106 1.00 0.250 0.50 53 594 1699
ActionJac 5AB-MSJ-I 6:1
  5 6:1 16 0.0376 1.50 0.375 3.00 376 500 2873
ActionJac 5AB-MSJ-I 24:1
  5 24:1 64 0.0144 1.50 0.375 0.75 144 330 1875
ActionJac 10AB-MSJ-I 8:1
  10 8:1 16 0.0377 2.00 0.500 5.00 753 418 4776
ActionJac 10AB-MSJ-I 24:1
  10 24:1 48 0.0192 2.00 0.500 1.50 384 246 2813
ActionJac 15AB-MSJ-I 8:1
  15 8:1 16 0.0407 2.25 0.500 5.00 1221 258 4424
ActionJac 15AB-MSJ-I 24:1
  15 24:1 48 0.0218 2.25 0.500 1.50 654 144 2478
ActionJac 20AB-MSJ-I 8:1
  20 8:1 16 0.0435 2.50 0.500 7.50 1740 272 6209
ActionJac 20AB-MSJ-I 24:1
  20 24:1 48 0.0218 2.50 0.500 2.50 873 180 4130
ActionJac 30AB-MSJ-I 10 2/3:1
  30 10 2/3:1 16 0.0452 3.38 0.667 11.00 2710 256 8764
ActionJac 30AB-MSJ-I 32:1
  30 32:1 48 0.0235 3.38 0.667 3.50 1411 156 5364
ActionJac 35AB-MSJ-I 10 2/3:1
  35 10 2/3:1 16 0.0493 3.75 0.667 11.00 3450 200 8035
ActionJac 35AB-MSJ-I 32:1
  35 32:1 48 0.0257 3.75 0.667 3.50 1800 122 4904
ActionJac 50AB-MSJ-I 10 2/3:1
  50 10 2/3:1 16 0.0555 4.50 0.667 16.00 5555 181 10382
ActionJac 50AB-MSJ-I 32:1
  50 32:1 48 0.0301 4.50 0.667 5.00 3014 104 5982