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
Bearing compartment
Determine whether the support is sealed in a motor chamber or exposed to pumped liquid.
Thrust support
Use pump thrust, rotor weight and direction changes for the full operating envelope.
Media
Record water chemistry, solids, abrasives and potential lubricant dilution.
Which bearing structures make sense?
Protected rolling-bearing supports
Evaluate against the motor chamber's actual oil/grease and seal design.
Check first: An ordinary sealed bearing is not automatically a submersible assembly.
Liquid-lubricated plain/thrust supports
Use the specified material and film/wear method.
Check first: Do not substitute rolling-bearing life equations for the actual support design.
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 every radial and thrust support and its lubricant/media exposure.
- Obtain hydraulic loads, rotor weight and transient thrust cases.
- Verify materials, lubrication, sealing and operating clearance for the exact support type.
- Follow the equipment's pressure/leak, electrical and mechanical commissioning checks.
Symptoms worth checking
Abrasive wear
Review solids ingress, filtration/barriers and the approved bearing material.
Thrust damage
Reassess hydraulic duty, axial retention and the lubrication path.
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
Does a 2RS seal make a bearing submersible?
No. Immersion resistance is an assembly-level requirement involving pressure, duration, seals and lubrication.
Why not simply recommend a stainless 6205?
The shaft size and bearing architecture may differ, and stainless construction does not validate thrust capacity or immersion duty.
Reference basis & recommendation limits
- NSK — Pumps & Compressors
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.