JWM Screw Jack FAQ – Answers to Your Most Common Questions
JWM Screw Jack FAQ – Answers to Your Most Common Questions
Q1: What load capacity does JWM cover?
JWM models range from JWM002 (0.2 tons) to JWM1000 (100 tons)
Q2: Does JWM have self-locking?
Yes. The trapezoidal screw provides self-locking – it holds the load without brakes under normal conditions. However, under vibration or shock, self-locking may fail.
Q3: What are the speed ratios?
JWM offers two ratios:
Fast (H): 6:1 – for higher speed
Slow (L): 24:1 – for higher torque and better self-locking
Q4: How do I calculate lifting speed?
Speed = (Motor RPM ÷ Ratio) × Screw Lead
Example: JWM050, 1450 RPM, 24:1 ratio, 8mm lead → 483 mm/min
Q5: What assembly types are available?
Three types:
Basic (US/DS) – screw moves
Anti-rotation (UM/DM) – screw moves without rotating
Traveling nut (UR/DR) – nut moves, screw rotates in place
Q6: What accessories do I need?
Common accessories:
Motor adapter
Handwheel (manual operation)
Screw protective boot
Anti-rotation device
Safety nut
