Surface Roughness : Ra 0.2 Torque Capacity : M4X8X15mm Structure : Deep Groove Model Number : CFS4V/KR8 Coatings : No Material : Stainless Steel Model : CFS4V/KR8 Accuracy level : ABEC-7 Screw Outer Diameter : M4 Outer Diameter : 8 mm Length : 15 mm Weight : 8.5 g Bearing material : Stainless Steel AISI304 Welcome to Lingfeng Store