Screw mainly used in stepper motor, Machine Tool, and other equipment.<br> Screw without processing, direct connected to bearing.<br> Suitable for Industrial automation equipment, stepper motor rails; such as 3D printers; engraving machine; module; slider; lifts etc.<br> color: gold+silver<br> Lead screw:<br> Material: stainless steel<br> Diameter: 8mm<br> spacing: 2mm<br> Total Length: 500mm<br> Screw nut:<br> Material: brass<br> Diameter: 8mm<br> Mounted ball bearing:<br> Material: zinc alloy<br> Bore diameter: 5mm<br> Hole diameter: 8mm<br> Total length: 55mm<br> Height: 29mm<br> Shaft coupling:<br> Material: aluminium<br> Shaft: 6.35 x 8mm<br> Length: 24mm<br> Diameter: 18mm<br> How to install:<br> 1. Pls put screw nut into the Lead screw<br> 2.Then the 2 Mounted ball bearing separately install at both ends of the Lead screw<br> 3. According to the size of you need to adjust the distance between the nut and Mounted ball bearing<br> 4. Put shaft coupling into the Lead screw beside the Mounted ball bearing<br> Package Included:<br> 2x Lead screw<br> 2x Screw nut<br> 4x Mounted ball bearing<br> 2x Shaft coupling<br> Only the above package content, other products are not included.<br> Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.