... *6, TR40*7, TR55*9, TR70*12, TR80*12. 3. It is suitable for low speed and low frequency 4. Main ... . It is suitable for heavy load, low speed, low service frequency 7. Trapezoid screw has self-lock function, it can hold up ... when screw stops traveling. 8. Accessory parts: Motor, hand wheel, rubber bellows, steel cover, frequency inverter and brake. 9. Application: Metallurgy, construction, irrigation ...