Q: What is the difference between a trapezoidal screw jack and a ball screw jack?

A: Trapezoidal screw jack uses an acme threaded screw that is typically self-locking, meaning it
     will hold its position without a brake. Ball screw jacks use ball screws to convert rotary
     motion to linear movement, and require 1/3 the horsepower compared to a trapezoidal screw
     jack. Due to the efficiency of the ball screw, brakes must be used to stop and hold the load
     screw in position. Brakes are also recommended for use on any jacks if vibration is present.

Ball Screw Jack Features:

1. Model: RNK-0.5T, RNK-2T, RNK-3T, RNK-5T, RNK-10T, RNK-20T
2. Function: Precisely controlled lifting, lowering, pushing, pulling and rolling movements
3. High efficiency, high speed, low loading, frequently use, high accuracy, long life
4. Arrangement: Single units, in pairs or multiple jacks systems, fully synchronization
5. Power Source: Electrically, manually or both