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When a worn or mismatched track roller causes vibration, premature wear, or binding in your cam mechanism or linear guide system, finding the exact replacement model matters. Engineers, maintenance technicians, and DIY machine builders rely on stud-type cam follower bearings to keep motion systems running smoothly under radial and axial loads.
These cam follower needle roller stud track bearings are available in models KR10 (CF3) through KR72 (CF24-1), covering outer diameters from approximately 10 mm (0.39 in) to 72 mm (2.83 in). Each unit features a needle roller complement housed within a thick-walled outer ring, mounted on a threaded stud shaft for direct installation into cam tracks, guide rails, and follower mechanisms.
Typical applications include CNC router cam followers, conveyor track rollers, automated assembly line guide systems, and custom linear motion rigs — anywhere a stud-type roller bearing must handle continuous radial loading along a track surface.
| Model Range | KR10 (CF3) to KR72 (CF24-1) |
|---|---|
| Bearing Type | Stud-Type Cam Follower / Needle Roller Track Bearing |
| Outer Diameter Range | 10 mm – 72 mm (0.39 in – 2.83 in) |
| Roller Element | Needle Rollers |
| Stud Thread Size | See variant options |
| Stud Length | See variant options |
| Inner Bore / Stud Diameter | See variant options |
| Overall Width | See variant options |
| Material | Bearing steel (outer ring, needle rollers, stud shaft) |
| Lubrication | Grease-lubricated (sealed or with lubrication hole — see variant options) |
| Load Direction | Radial (primary); limited axial guidance |
| Available Quantities | 1 Pcs / 2 Pcs |
Match the model number stamped on your existing bearing — it will read KR10, KR12, KR13, KR16, KR19, KR22, KR26, KR30, KR32, KR35, KR40, KR47, KR52, or KR72. The number corresponds to the outer diameter in millimeters. The CF designation in parentheses (e.g., CF3, CF4) is an equivalent designation used in some catalogues for the same bearing.
KR and CF are parallel designation systems for stud-type cam followers. KR is the INA/FAG-style designation, while CF is used in other manufacturer catalogues. KR10 = CF3, KR12 = CF4, KR13 = CF5, and so on. Both refer to the same bearing geometry — the number after KR indicates the outer diameter in mm.
Yes. The outer ring running surface is designed to roll on hardened cam tracks and guide rails. For best service life, the mating track surface should have a hardness of 58 HRC or higher and a ground finish. Running on unhardened or rough surfaces will accelerate outer ring wear.
These stud-type cam followers are primarily designed for radial loading — the load applied perpendicular to the stud axis as the outer ring rolls along a track. They can tolerate limited axial (thrust) forces, but for applications with significant combined radial and axial loads, consider a crowned outer ring variant or a separate thrust element in your design.
Thread the stud into the tapped hole in your cam plate or follower arm and tighten to the torque specification for the stud thread size. Ensure the outer ring is free to rotate and makes full contact with the cam track surface. Do not press or hammer the outer ring — load must be applied through the stud, not the outer ring.
Re-lubrication intervals depend on operating speed, load, and environment. For moderate-duty applications, inspect and re-grease every 500–1,000 operating hours. Models with a lubrication hole (hex socket in the stud end) can be re-greased in place using a grease nipple adapter. Sealed models are pre-greased for the service life of the bearing.
Many cam and linear guide designs use paired cam followers on opposite sides of a track or rail. Ordering 2 Pcs ensures both rollers are from the same production batch, with matched dimensional tolerances — reducing the risk of uneven preload or misalignment in symmetrical follower arrangements. It also gives you an immediate spare if one unit fails unexpectedly.
