Track Roller Bore Diameter 2 1/4 in Closure Double Sealed Duty Type Standard Overall Length 3 3/8 in Roller Diameter 6 in Roller Head Type Crowned Roller Material Alloy Steel Roller Width 3 1/4 in Rolling Element Rows 1 Seal Type Contact System of Measurement Inch Bearing Material Alloy Steel Bearing Material Grade 52100 Bearing Type Needle Roller Dynamic Radial Load Capacity 71 400 lbf