... 4,product specification under request Technical data:1,lifting power:1.98-980(kN)2,lifting speed:0.0105- ... screw type)JWM type (trapezoid screw type) suitable for low speed, low frequency occasions, main composition parts for: precision acme screw ... compact structure, simple operation, maintenance is convenient. 2, low speed, low frequency: mainly used in large load, speed and without frequent the ...