Manual Screw Jack is composed of hand wheel or hand crank and a worm gear screw jack, which has intermittent precisely positioning and self-locking feature for no creeping down without brake mechanism or other locking systems, when manual 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.
Hand Crank Screw Jack is ideal solutions for applications where electricity or
power generators is inconvenient or dangerous, light weight, low duty
cycle, low target cost and short travel length.