... . Generator control panel 3. fast and easy assembly 4.stable operation 5. rich experience SJ series worm ball screw or screw ... . 2. The dimension of screw isTR18*4, TR22*5, TR30*6, TR40*7, TR55*9, TR70*12, TR80*12. 3. It ... high precision worm-gears pair 5. Compact design, easy operation, convenient maintenance 6. It is suitable for heavy load, low speed, low ...