Manual Worm Gear Screw Jack is ideal solutions for applications where electricity or power generators is inconvenient or dangerous, lightweight, low duty cycle, low target cost and short travel length. Manual Worm Gear Screw Jack Manual human force = required torque of input shaft(nm) / cast iron hand wheel radius(m).

Manual Worm Gear Screw Jack parts include cast iron hand wheel and a complete set worm gear screw jack, coupled by key & keyway with jimi screws fixed. When manual worm gear screw jack need precise position display, a range of digital position indicators are available. These digital position indicators measure the rotations of the input shaft and display corresponding position in the digital counter window. The display value per input shaft revolution is variable and is achieved through a series of gear reductions configured to accommodate different worm gear ratios, screw pitch and travel length. When manual worm gear trapezoidal screw jack, which has intermittent precisely positioning and self-locking feature for no creeping down without brake mechanism or other locking systems, But when manual worm gear ball screw jack, no self-locking feature, avoid ball screw back drive with attached load, which needs additional brake mechanism or other locking system to prevent it creep.

Manual Worm Gear Screw Jack like manual worm gear trapezoidal screw jack, manual worm gear ball screw jack have a disadvantage, slow travel speed, maximum 1 to 1.5 mm travel length per full turn of cast iron hand wheel. But manual high speed bevel gear screw jack is ideal solution of slow travel speed with internal pairs spiral bevel gears drive, maximum up to 12mm travel length per full turn of cast iron hand wheel. When you required manual screw jack, but need quick lifting speed, high speed bevel gear screw jack will be the best choice.