Manual screw lift (miniature screw lift) structure is simple main parts as follows: 1 case (usually cast iron, stainless steel screw lift can choose according to your needs, swl screw lift steel, aluminum and other materials) 2 worm shaft 3. copper-containing internal threads and other small pieces of worm 4. accessories. Manual screw lift (mini screw jack) There are many applications on the device, and made as products become commercialized market, and successful promotion; and promote the machinery industry in the application of Annex assembly, mechanical design convenience and practicality; in the transmission parts market has become common trend. A type of structure - screw for axial movement screw lift prices, does not rotate; B Type - nut for axial movement, the lead screw rotates. Screw Connector Type A screw head structure is divided into: type 1 (cylindrical) qwl screw lift, type 2 (flange), type 3 (screw), type 4 (flat head), type 5 (open) were found in five; B-type structure of the screw head is divided into: 1 type (cylindrical), type 0 (no connector) total two kinds.