Surface Roughness : Ra 0.2 Torque Capacity : M12X30X40.2 mm Structure : Deep Groove Model Number : CF12/KR22 Material : Stainless Steel Model : CF12/KR30 Accuracy level : ABEC-7 Screw Outer Diameter : M12 Outer Diameter : 30 mm Length : 40.2 mm Weight : 110 g Bearing material : Stainless Steel AISI304 Welcome to Lingfeng Store