This listing is for 4 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: 0.5000 in Roller width: 0.3750 in Stud diameter: 0.2500 in Stud length: 0.6250 in Roller shape: Flat Roller material: Chrome Steel Bearing element: Needle Rollers Stud type: Heavy Stud Closure type: Sealed Head type: Slotted Head Thread size: 46844 Radial dynamic load capacity: 680 lbs Radial static load capacity: 600 lbs Maximum rpm: 11500 rpm Lubrication hole location: Stud Side Finish/coating: Black Oxide Series: Heavy Stud CAMROL