Specification Brand : WAFJAMF BulletPoint : ABEC RATING: ABEC1Ball Diameter: 3.969Ball Grade: 10Ball Material: AISI 52100 Chrome SteelNumber Of Balls: 7Bearing Material: AISI 52100 Chrome Steel# Of Shields: 2Inside Diameter: 8mmOutside Diameter: 22mmWidth: 7mmBasic Load: 1370 NDynamic Load: 3300 NWorking Temperature: -20 to 120 CRPM w/ Grease: 33,000RPM w/ Oil: 39,000Chrome steel ball bearing for durability and resistance to deformity under heavy loads. There are a total of 7 balls of grade 10. The shield protects the working parts of the BulletPoint1 : Dimensions: 1/2"x1-1/8"x5/16" BulletPoint2 : Rubber seal on both sides BulletPoint3 : 100% Chrome Steel for higher resistance and durability BulletPoint4 : Supports 20,000 rpm BulletPoint5 : Our high-quality bearing is made to reduce your replacement frequency and maintenance cost ExternallyAssignedProductIdentifier1 : 790885931093 ExternallyAssignedProductIdentifier2 : 0790885931093 ExternallyAssignedProductIdentifier3 : 688938510084 IncludedComponents : R8-RS-10 Pcs ItemName : R8-2RS Sealed Ball Bearing 1/2"x1-1/8"x5/16" - Lubricated - Chrome Steel 10Pcs ItemPackageDimensions_Height : 10.3886 centimeters ItemPackageDimensions_Length : 1.8034 centimeters ItemPackageDimensions_Width : 8.001 centimeters ItemPackageQuantity : 10 ItemTypeKeyword : deep-groove-ball-bearings Manufacturer : WAF Material : Alloy Steel ModelNumber : R8-RS-10 Pcs NumberOfItems : 10 PartNumber : R8-RS-10 Pcs ProductDescription : Model: R8 RS Quantity per Package: 10 Pcs Material: 100% Chrome Steel Protection: Rubber Seal on both sides Greased / Lubricated: Yes Bore (Inner) Diameter: 1/2" Outer Diameter: 1-1/8" Width (Thickness): 5/16" Supported Revolutions per Minute (RPM): 20,000 WAF’s R8-Rs made with Chromium Steel providing superior quality and durability. It comes pre-lubricated and shielded to keep the lubricant in and contaminants, dirt and debris out. High speed deep groove ball bearing, capable of bearing radial and axial loads. The double rubber seal shields on both sides of the bearing prevent the entry of lubricant and pollutants without additional lubrication.