Product Description High-end product among steel bearings: the 61804 LLB ABEC 5 by Enduro Bearings In order to meet the ABEC 5 standard, a bearing must meet extremely high requirements for the roundness of the balls, tolerances of the inner and outer diameters, alignment of the running surfaces and low noise. ABEC 5 bearings from Enduro Bearings feature R64 hardened 5th degree chrome steel balls, making them suitable for high precision applications. They move in vacuum-formed treads made of 52100 carbon chrome steel, which are particularly resistant and durable. The nylon graphite ball bearing cages have virtually no friction, and ensure constant double-sided supply of Rheolube 374A grease. Specifications:Dimensions (Inner x Outer x Width):20 mm x 32 mm x 7 mmDesignation:61804Models:Type 1: Design:deep groove ball bearingsTolerance:ABEC 5Recommended Use:hubsInner Race Material:steel (52100)Outer Race Material:steel (52100)Ball Material:steelSeals:LLBBasic static load rating:1.9 kN (438 lbs)Manufacturer Number:61804LLBFeatures:Level 5 in the rating of the Annular Bearing Engineer's Committee (ABEC) in terms of manufacturing tolerances and noise developmentchrome steel balls 5th degree = roundness is 5/1,000,000"treads made of carbon chrome steel alloy, heat- and cold-treated (down to -190° C), hardness min. Rockwell HRC 62, high gloss polish for precision and quietnessnylon graphite ball cage, grease supply on both sidesLLB: widely used seal type made of nitrile rubber with steel insert, in a groove in the inner race (labyrinth bearing), two super thin sealing lips; the outer one keeps out water and contaminants, the inner one retains greasebearing clearance: C3Contents:1 x Enduro Bearings 61804 20 mm x 32 mm x 7 mm ball bearing Weight: universal | 61804: 17.9 g Manufacturer: Enduro Bearings 650 Lighthouse Ave. #120 Pacific Grove CA 93950 USA info@endurobearings.com Distributor: Cosmic Sports GmbH Leyher Straße 47 90763 Fürth Germany info@cosmicsports.de