... quality. 2.square gear housing 3.high efficiency MA series screw jacks performance parameters as following:1. The main component are ... , MA25, MA50, MA80, MA100, MA200, MA350.4. The dimension of screw isTR18*4, TR22*5, TR30*6, TR40*7, TR55*9 ... is suitable for heavy load, low speed, low service frequency7. Accessory parts: Motor, hand wheel, rubber bellows, steel cover, frequency inverter ...