Recommended length: the longer the length, the smaller the diameter, the simpler it's to bend1.100-1000mm Recommended SFU1204/SFU1605/SFU2005/SFU2505/SFU32052.1000-1600mm Recommended SFU1605/SFU2005/SFU2505/SFU32053.1600-2000mm Recommended SFU2005/SFU2505/SFU32054.2000-2500mm Recommended SFU2505/SFU32055.2500mm+ Recommend SFU32051* Ball screw rod with nut1* BKBF assist seat1* Nut seat 1* Coupling1. G10 grade GCR15 metal ball2. High pace and occasional noise3. Super wear-resistant① Nut② Dust ring③ GCR15 Steel ball④ Circular reverser⑤ Waist metal inverterStepper MotorMotor IntegratedSeatSliding Table1:What is the accuracy of the ball screwAnswer:C72:How to cope with either ends of the ball screwAnswer:Hardening3:What does SFU2005 meansAnswer:20mm ball screw with 5mm pitch,pitch is One turn of the nut, the stroke is 5mm