PBC Linear PAC3016 Cam Follower, 1 3 8 in Roller Dia, Crowned, Zinc Plated Steel, Double Sealed 1005151016 Chain size: 3 4 inch Chain size: 3 4 inch Equivalent Series ECSR ) 250 lb Stud Material Zinc Plated Steel Bearing Material Zinc Plated Steel Bearing Type Ball Roller Type Crown Roller Material Carbon Steel Stud Type Concentric Dynamic Load Capacity (Lb ) 399 lb For Use With Hardened Crown Roller Rail Rolling Element Rows 1 Closure Double Sealed Features Hardened Crown Rollers Seal Material Nylon 6 6 Seal Type Contact Dynamic Radial Load Capacity 300 lbf Duty Type Standard Drive Type External Hex Static Radial Load Capacity 399 lbf Drive Location Stud System of Measurement Inch Roller Head Type Crowned Country of Origin China