Project Description
This worm screw jack load capacity from 1 ton to 100 ton. Very precise and reliable, it can meet all the necessary safety, cost-efficiency, and durability mandates of your application.
- Drive method: Electric worm screw jack by motor and manual worm screw jack by handwheel
- Trapezoidal spindle, Ductile iron housings, taper roller bearings provide rugged reliability, high strength bronze worm gear
- Version: upright or inverted, traveling nut or screw translating
- Option: Anti-rotation, anti-backlash, safety nut, left-hand screw threads
You can trust us on high quality, on-time delivery, controlled costs and reduced risk
Worm Gear Screw Jack LMM Technical Date
Model | LMM1T | LMM2.5T | LMM5T | LMM10T | LMM15T | LMM20T | LMM30T | LMM50T | LMM75T | LMM100T | |
Maximum Load (T) | 1T | 2.5T | 5T | 10T | 15T | 20T | 30T | 50T | 75T | 100T | |
Outer Diameter of screw (mm) | 20 | 26 | 40 | 50 | 55 | 65 | 85 | 120 | 130 | 150 | |
Root Diameter of screw (mm) | 14.8 | 19.7 | 30.5 | 38.4 | 43.4 | 51.3 | 67 | 102 | 112 | 127 | |
Screw Pitch (mm) | 4 | 5 | 8 | 10 | 10 | 12 | 16 | 16 | 16 | 20 | |
Gear Ratio | H | 5 | 6 | 6 | 8 | 8 | 8 | 10.6 | 10.6 | 10.6 | 12 |
L | 20 | 24 | 24 | 24 | 24 | 24 | 32 | 32 | 32 | 36 | |
Efficiency % | H | 21 | 21 | 22 | 22 | 20 | 20 | 19 | 15 | 13 | 13 |
L | 12 | 12 | 14 | 15 | 14 | 13 | 11 | 10 | 8 | 8 | |
Permissible max. Power ( KW ) | H | 0.49 | 1 | 2 | 2.8 | 3.1 | 5 | 8.4 | 13.4 | 14.4 | 21.4 |
L | 0.36 | 0.46 | 0.63 | 1.4 | 2.2 | 3.2 | 4.6 | 5.7 | 7.2 | 9.4 | |
No-load Torque(N·m) | 0.29 | 0.62 | 1.4 | 2 | 2.6 | 3.9 | 9.8 | 19.6 | 29.4 | 39.2 | |
Permissible torque of input shaft (N·m)* | 19.6 | 49 | 153.9 | 292 | 292 | 292 | 735 | 1372 | 1764 | 2450 | |
Required torque of input shaft at max. Load (N.m) | H | 6.2 | 16.1 | 48.7 | 90.7 | 149 | 238.1 | 400.1 | 856 | 1380.5 | 2040.9 |
L | 2.9 | 7.4 | 20 | 45.3 | 72.3 | 124 | 244 | 453.3 | 761.3 | 1278.3 | |
Screw travel length (mm) per turn of worm shaft | H | 0.8 | 0.83 | 1.33 | 1.25 | 1.25 | 1.5 | 1.5 | 1.5 | 1.5 | 1.67 |
L | 0.2 | 0.21 | 0.33 | 0.42 | 0.42 | 0.5 | 0.5 | 0.5 | 0.5 | 0.56 | |
Permissible max. Input(rpm) when max. load | H | 750 | 600 | 400 | 300 | 200 | 200 | 200 | 150 | 100 | 100 |
L | 1200 | 600 | 300 | 300 | 290 | 250 | 180 | 120 | 90 | 70 | |
Screw torque when max. Load (N·m) | 20.1 | 65.1 | 201.5 | 503.6 | 813.2 | 1287.7 | 2531.9 | 5551.3 | 8921.8 | 13878.3 |
screw jack type option

screw top end option

screw worm shaft input option

LMM Jack Order Guide
LMM Model NO— screw jack type – top end type – worm shaft type – gear ratio – travel length – necessories(limit swith/bellow)
- If the mechanical lifting worm jack is loaded in compression. It may be necessary to select a jack with a load greater than the nominal. This is due to the relationship of the diameter to the maximum spindle length. You can consult our engineering for analysis of the applied force.
- As the duty cycles are intermittent, there is an inverse relationship in relation to the maximum duty cycle of the actuators and the load being moved.Please consult our application engineers for assistance in determining the most suitable worm jack.
- The input RPM must not exceed the value in the table.
- Never exceed the static and dynamic capacity of the jack.
- Never exceed the power listed in our specification tables.
- If the maximum power recommendation is exceeded, reduce the speed or use a larger capacity jack.
Application cases of worm drive screw jack
You can benefit from our wide application experience in diverse industries including transportation, packaging, factory automation, material handling, printing, automotive, machine tool, paper, steel, food, and beverage etc.



Please share with us your project details, then we can provide a complete worm screw jack lifting solutions with 3D models. The necessary information includes:
- Total load (KN)
- Effective stroke (mm)
- Load of each actuator (if more than one is required)
- Load type (tension, compression, guidance, no guidance)
- Speed request (mm/min)
- Duty cycle
- Applicable ambient temperature (-20º to 50ºC)