SpecificationsLead screw Materialstainless steelDiameter8mmPitch2mmLead4Total Length400mmScrew nut MaterialbrassDiameter8mmPitch2mmLead4Mounted ball bearing Materialzinc alloyBore diameter8 mm8mmTotal length55mmHeight29mmShaft coupling MaterialaluminiumShaft6.35 x 8 mmLength25 mmDiameter20mmMotor Voltage24VStep angle1.8°Accuracy of step angle ±5%Accuracy of resistance±10%Accuracy of inductance±20%Insulation resistance100mΩmin 500VDCRadial clearance0.02MaxAxial clearance0.08MaxRadial maximum tolerance28NAxial maximum tolerance10N Features3D printer T8 400mm Stainless Steel Lead Screw Screw nut Mounted ball bearing Shaft coupling Motor.Screw mainly use for Stepping motor driving guide rail,machine tool, and other equipment.Screw without processing, direct connected to bearing.T shape design, make of high quality stainless steel material.Easy to install and convenient to use.Fine producing and practical.Suitable for Industrial automation equipment, stepper motor rails;Fit for 3D printer; engraving machine; XYZ module; slider; lifts ect.How to install:1. Put screw nut into the lead screw.2. Then the 2 Mounted ball bearing separately install at both ends of the Lead screw.3. According to the size of you need to adjust the distance between the nut and Mounted ball bearing.4. Put shaft coupling into the Lead screw beside the Mounted ball bearing. What’s in the box?1 x 400mm Lead screw1 x Screw nut2 x Mounted ball bearing1 x Shaft coupling1 x Motor