How to Measure a Track Roller or Cam Follower

First identify the mounting type

Yoke track rollers mount through an inner-ring bore. Stud cam followers use an integrated threaded or smooth stud. Guide rollers may use a flange, eccentric collar or special profile. Establishing the mounting type prevents a dimension from being assigned to the wrong feature.

Dimensions for a yoke roller

• d — bore diameter: measure the inner-ring bore and note any sleeve or special fit.
• D — outside diameter: measure the largest running diameter.
• B — overall width: record the complete width across the inner ring or side faces.
• C — outer-ring width: distinguish the track-contact width from overall width where they differ.
• Side details: record shoulders, spacers, retaining-ring grooves and seal positions.

Dimensions for a stud follower

• Outer diameter and outer-ring width
• Overall length and stud length
• Thread diameter, thread pitch and threaded length
• Stud shoulder diameter and shoulder length
• Hex socket, screwdriver slot, grease fitting or lubrication-hole details
• Eccentric collar diameter and offset where applicable

Describe the outer-ring profile

A crowned or convex outer ring reduces sensitivity to misalignment and edge loading, while a cylindrical outer ring provides a different contact pattern. V-groove, U-groove and concave rollers require the profile radius, groove angle, groove width and mating-track geometry. Do not assume two rollers with the same maximum outside diameter have the same running surface.

Check seals and lubrication

Photograph both sides. Note open construction, rubber or plastic seals, metal shields, grease holes and relubrication paths. Record the lubricant if the application has temperature, food-grade, vacuum or compatibility requirements. Suffixes often identify these variations.

Measurement limitations

Measurements from a worn component are suitable for preliminary identification but may not represent the original tolerance or profile. Wear, corrosion and load damage can reduce diameters or distort contact surfaces. Final approval should use the original drawing, a verified replacement drawing or controlled inspection data.

Operating data that completes the specification

Share the radial load, any axial load, speed, shock, duty cycle, track material and hardness, alignment, temperature and contamination. Include the machine model and the roller's function. This helps distinguish a standard track roller bearing from a drawing-based special roller.