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TECHNICAL SPECS Item: SMR74 2RS CB Structure: Deep GrooveBearing Material: 440C Stainless SteelBall Material:Ceramic Si3N4Bearing Type : Hybrid ceramic ball bearing Bore Dia (d): 4 mm Outer Dia (D): 7mm Width (B): 2.5mm Closures: Rubber Seal Lubrication: Free of Grease Free of Runing Magnetic: little Hardness: 58HRC Corrosion Resistance: General Clearance: C0 Bearing Grades: ABEC 7