Item Type: Lead Screw Model: 5501-0804-0300 Material: Stainless steel Lead: Approx. 8mm / 0.3in Thread Number: 4 Pitch: Approx. 2mm / 0.1in Length: Approx. 300mm / 11.8in Purpose: Accessories in the field of robotics, an excellent mechanism for converting rotation into linear motion. Package List 1 x Lead Screw 1The 8mm lead screws have 4 threads with a 2mm pitch which yields 8mm of linear travel of a lead screw nut for each rotation of the lead screw. 2Often used as an accessory in the field of robotics, an excellent mechanism for converting rotation into linear motion. 3Using this lead screw can achieve the accuracy of a 3D printer or the strength of a scissor jack. 4The 8mm lead is compatible with many components, such as 8mm pillow blocks and 8mm thrust bearings. 5The lead screw made of stainless steel is antirust and anticorrosion, and can maintain good performance even after longterm use.