Keep the evidence with the model shortlist
The models on this page illustrate bearing roles; they are not confirmed replacements for an unspecified machine. Keep the original complete marking, machine position, load and speed duty, temperature, lubricant and mounting arrangement together. Check the candidate's recorded values below and leave unreported parameters unknown.
Check drawings and model records · Investigate a failure before replacing it · Plan installation and force paths
What matters in this application
Track contact
Record roller profile, rolling diameter, flange geometry and mating mast rail.
Mounting
Identify stud or shaft support, shoulder location, fasteners and axial adjustment.
Duty
Use the load-centre geometry, lift height, side loads, impact and the approved rated-load envelope.
Which bearing structures make sense?
Mast guide rollers
Use the exact track and mounting specification.
Check first: A different crown or flange profile can change contact loading and guidance.
Carriage/combined rollers
Evaluate their radial and axial guidance functions together.
Check first: Do not replace a combined roller with a simple ball bearing.
Model selection & data availability
Use the selection requirements below to identify the exact specification. A general-purpose bearing is not presented as a substitute for an unverified specialist design.
Search an existing designation →Work through the selection
- Identify the exact mast or carriage position and original roller part.
- Inspect rail wear, roller profile and retention before selecting a replacement.
- Verify rated-load and guidance requirements using the equipment documentation.
- Follow the forklift maintenance and release-to-service process.
Symptoms worth checking
Jerky movement
Check track condition, roller adjustment and alignment as well as bearing damage.
Uneven roller wear
Inspect the load path, rail geometry and roller profile.
Symptoms are investigation prompts, not a diagnosis. Isolate equipment safely and follow its maintenance procedures before inspection.
Have the original designation?
Look up the complete model and suffix before comparing potential alternatives.
Application questions, answered
Can outside diameter identify a mast bearing?
No. Width, track profile, stud/shaft geometry and guidance requirements must also match.
Does this page provide forklift-model fitment?
No. It explains selection inputs and the limits of generic records; approved equipment parts must be verified separately.
Reference basis & recommendation limits
- NSK — Quarrying, Mining and Construction
Application principles are informed by the listed technical references. Model shortlists are BearingScope editorial selections from its database, not manufacturer endorsements or equipment-fit approvals. Confirm the latest exact specification and the complete equipment design before use.