Clear specifications. Consistent inspection. Confident purchasing.
Focused on NU, NJ and NUP cylindrical roller bearings, our quality requirements cover component geometry, ring properties, rolling-contact surfaces and the finished bearing. Share your drawing and inspection requirements so the scope can be agreed for your order.
Discuss your inspection requirements →Explore the checkpoints ↓
Inspection scope and acceptance criteria are confirmed for the bearing type and order requirements. The diagrams below explain inspection topics; they are schematics, not photographs, measured results or step-by-step test instructions.
Review the boundary dimensions.
Check bore d, outside diameter D and width B against the drawing and specified tolerances. Use an appropriate measurement method and record the units, measuring conditions and acceptance limits.
Control the geometry of the cylindrical rollers.
Define roller diameter, length and relevant form requirements in the inspection plan. Diameter measurement and roundness evaluation are separate checks; the method and acceptance limits must match the component specification.
Confirm the specified hardness requirements.
Agree the hardness method, test location, sample preparation and acceptance range for the ring material and heat treatment. Rockwell and micro-Vickers results should be reported with the correct scale and test conditions.
Review the rolling-contact surfaces.
Assess the raceway surface condition and specified roughness parameters, such as Ra or Rz. Measurement direction, filtering and evaluation length should be defined for the agreed surface texture requirement.
Check clearance for the selected arrangement.
Confirm the specified clearance group and applicable limits for the complete cylindrical roller bearing. Define measuring load and method, and distinguish unmounted internal clearance from clearance after mounting or during operation.
Match the finished bearing to the order.
Review the complete NU, NJ or NUP designation, cage, dimensions, specified clearance, surface condition and agreed inspection records. Confirm preservation, identification, quantities and packing before dispatch.
A micro-Vickers tester combines a controlled indentation with optical measurement. The appropriate hardness method and test conditions depend on the material, location and inspection requirement.
This licensed photograph shows reference equipment. It does not depict an AOSN facility or confirm ownership of the instrument.
A dimension match alone does not establish that two bearings have the same specification. Confirm the complete arrangement and any additional inspection requirements.
| Check area | Items to review | Reference to provide |
|---|---|---|
| Product identity | Bearing number, series and suffix | Original number, drawing or agreed product specification |
| Boundary dimensions | Bore d, outside diameter D and width B / T | Drawing dimensions, units and tolerance requirements |
| Accuracy & geometry | Dimensional tolerances and relevant runout | Required accuracy class and applicable acceptance limits |
| Internal clearance | Required clearance for the selected arrangement | Clearance designation and operating / mounting conditions |
| Cage, seals & lubrication | Cage material, seal / shield configuration and lubricant | Specified suffixes, lubricant and working environment |
| Surface & running condition | Visual condition and specified functional checks | Test method, limits and inspection scope when needed |
| Packaging & documents | Marking, preservation, quantities and agreed records | Packing instructions and documentation requested before ordering |
On mobile, swipe the table horizontally. Special testing, sampling frequency and documentation should be agreed before production or dispatch.
Tell us which records your purchasing or engineering team needs. Available documents, test scope and timing will be confirmed in the quotation or order agreement.
Provide the original bearing number or drawing, dimensions, tolerance requirements, internal clearance, cage and seal configuration. State any applicable acceptance standard or customer specification.
Specify the measured items, reporting format and sampling expectations. Discuss dimensional records, material documentation or functional test results when needed for the order.
Confirm product marking, quantities, packing instructions and the records to accompany the shipment. Ask about identification requirements if your receiving process needs batch or order references.
Share the bearing number, application, drawing and required quantity. Identify the critical inspection points.
Confirm acceptance criteria, sampling, any special tests and the documents required for the order.
Confirm identification, preservation, packaging and agreed records before dispatch.
If a concern arises, send the order reference, model, photographs and operating conditions so the issue can be assessed.
Include the report requirements in your enquiry: the bearing model, measured items, acceptance limits, sampling and required format. Document availability and any additional testing are confirmed for the specific order.
Inspection requirements vary with bearing type, specification and application. Noise, vibration, hardness and other tests need defined methods and limits. Confirm the scope instead of assuming that every model follows an identical test plan.
Provide the complete original number including suffixes, main dimensions, photographs or a drawing, and operating conditions. Cage, clearance, seals, lubricant and accuracy requirements may differ even where dimensions match.
State the exact certification, standard, edition and document requirements before ordering. Ask the sales team to confirm applicability and available evidence for the requested product and order.
Send your order reference, bearing number, quantity affected, clear photographs and a description of the concern. Include mounting, lubrication, load, speed and temperature information where relevant. Keep the product and packaging available for review.
Send the bearing model or drawing, quantity, destination country and the inspection documents you require. Include any customer specification so the scope can be reviewed before you order.
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