This listing is for 2 piece/s.The basic design of these products is essentially that of a conventional rolling bearing, except that they have a thick-walled outer ring. Stud type track rollers have a shaft stud at one end. In the majority of applications, the outer ring is subjected to circumferential load, i.e. the outer ring rotates while the inner ring or stud remains stationary. The thick walled outer ring prevents excessive deformation of the track roller and ensures that the rolling element set is uniformly loaded Specifications Roller diameter: 0.8750 in Roller width: 0.5000 in Stud diameter: 0.3750 in Stud length: 0.8750 in Roller shape: Flat Roller material: Chrome Steel Bearing element: Needle Rollers Stud type: Standard Closure type: Sealed Head type: Hex Head Thread size: 45507 Radial dynamic load capacity: 1660 lbs Radial static load capacity: 1500 lbs Maximum rpm: 5400 rpm Lubrication hole location: Stud Side Finish/coating: Black Oxide Series: Inch CAMROL (CF)