TECHNICAL SPECS Item: SMR84ZZ Structure: Deep Groove Bearing Material: SUS440C Stainless Steel Ball Material: SUS440C Stainless Steel Bearing Type : Stainless Steel Ball Bearing Bore Dia (d): 4mm Outer Dia (D): eight mm Width (B): 3 mm Closures: Metal Shielded(ZZ) Lubrication: Greased Magnetic: little Hardness: 58HRC Corrosion Resistance: General Clearance: C0 Grades: ABEC Grades 7 Dynamic Load Rating (Cr) (Newtons): 336 Static Load Rating (Cor) (Newtons): 113