Cubic Bevel Gear Machine Screw Jacks, Compact Design, also Called Quick Lifting Screw Jacks which incorporate the use of a self-locking Trapezoidal Screw, are a supplement to our range of worm gear screw jacks. These jacks do not use worm gearing but bevel gearing. All bevel gear lifting screw jacks are equipped with hardened, sharpened and spiral-toothed bevel gearbox ensures higher efficiency, higher lifting speed, greater duty cycle and a longer service life. The JTQ Series Bevel Gear Jacks are modular design in 4 sizes. Each size is available with gear ratios 1:1 and 2:1. Gear housings are cubic design housing, compact and robust, they are made of aluminum alloy with anodizing. Compared with cast iron gearbox, it is lighter in weight, higher in strength, and easier to dissipate heat.