Screw Jack

High-lead Ball Screw Jack


High-lead type ball screw jack using a ball screw shaft (lifting screw) which is best for high-speed operation


  • – Capacity: 4kN~200kN
  • – The use of the high-lead ball screw achieves even faster lifting speed than standard ball screw jacks at the same input rotation speed.
  • – This type uses rolling friction between the nut and lifting screw, and its efficiency is approximately 3 times higher than that of the trapezoidal screw type, realizing energy-saving operation.
  • – We can also manufacture a jack with anti-rotation mechanism which prevents its lifting screw from drag turning.
  • – Wide-ranging options are available, including dustproof bellows to protect the lifting screw, trunnion base, limit switch for control, and RC encoder.
  • – This type of jack does not have a self-locking function, so it is required to install a brake.

Standard Specifications

Series/Size Code RSF J0F J1F J2F J3F J4F
Capacity 4kN 10kN 25kN 50kN 100kN 200kN
Lifting screw diameter 16mm 20mm 25mm 36mm 40mm 50mm
Lifting screw lead 16mm 20mm 25mm 36mm 40mm 50mm
Worm gear ratio 5 5 6 6 8 8
Effciency 0.64 0.64 0.61 0.61 0.59 0.6
Maximum allowable power per jack 0.63kW 0.75kW 1.3kW 2.5kW 3.7kW 6kW
Input shaft torque at no load (b) 0.15N・m 0.3N・m 1N・m 2N・m 3N・m 5N・m
Torque coefficient (a) 0.80 1.0 1.09 1.56 1.34 1.66
Required input torque at maximum load 3.4N・m 10N・m 28N・m 80N・m 137N・m 337N・m
Required input torque at maximum load 1.8N・m 6.6N・m 16N・m 47N・m 61N・m 156N・m
Speed coefficient (c)
(screw lead per rotation of input shaft)
3.2mm 4mm 4.17mm 6mm 5mm 6.25mm
Maximum allowable input rotation speed (over 1000min-1 must be oil lubruicated) 2000min-1 1800min-1 1800min-1 1800min-1 1800min-1 1800min-1
Anti-rotation key torque at maximum load 1.5N・m 5N・m 15N・m 45N・m 100N・m 250N・m
Input shaft allowable overhang load 300N 300N 450N 700N 1200N 1200N
Amount of filled grease Maintenance-Free 0.15kg 0.6kg 0.9kg 1.5kg 3kg
Operating temperature range -15〜80℃ -15〜80℃ -15〜80℃ -15〜80℃ -15〜80℃ -15〜100℃

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