Catalogue group | Selected references | What to check |
|---|---|---|
NU-series bearings | NU204, NU2204, NU2226E, NU326, NU2326 | Complete designation, dimensions, cage and internal clearance |
Special-reference bearings | CBK238 / JC8003, CBK239 / JC8002, F-554185.01.NUP | Equipment reference, drawing and exact construction |
Flanged outer-ring design | 566616B | Flange geometry, dimension units and mounting arrangement |
Double-row and full-complement listings | NNU4934, F-6666 | Row arrangement, cage or full-complement design and operating requirements |
Four-row listings | 314484, 313812 | Bearing assembly, roll-neck dimensions and installation requirements |
These are selected catalogue references. Specify the exact version required when enquiring; the same basic dimensions do not establish that two bearings are interchangeable.
Cylindrical roller bearings use rollers in line contact with the raceways and are selected for substantial radial loads. Many designs have separable rings, which can assist mounting and removal. Single-row, double-row and four-row arrangements serve different equipment requirements.
For purchasing, identify the construction before comparing quotations. A bearing used at a non-locating position has a different job from one used to locate the shaft axially. The correct choice also depends on the load, speed, lubrication and installation.
Design | General axial function |
|---|---|
NU and N | Permit axial displacement between the rings in both directions within the design limits; commonly used at non-locating positions |
NJ and NF | Can accommodate limited axial load in one direction |
NUP | Can locate the shaft axially in both directions, within the bearing's permitted operating limits |
This is a general selection guide, not a statement that every design and size is available. Confirm the complete construction and arrangement from the drawing before specifying a replacement.
Purchasing item | Details to provide or agree |
|---|---|
Full designation | Prefixes, basic number, suffixes and any equipment reference |
Dimensions | Bore, outside diameter, width, shoulders, grooves and flange dimensions where applicable |
Bearing arrangement | Locating or non-locating position, permitted axial movement and whether axial load is present |
Internal construction | Number of rows, cage design or full-complement construction, and required components |
Clearance and tolerances | Specified internal clearance, tolerance class and shaft/housing fits |
Operating conditions | Speed, radial and axial loads, temperature and lubrication method |
Order acceptance | Drawing revision, inspection requirements and any sample-approval criteria |
Commercial requirements | Quantity per reference, delivery destination, packaging and required delivery date |
For separable designs, state whether you require a complete bearing assembly. Do not assume that rings and roller assemblies from different sources can be mixed without a technical assessment.
Distributors and wholesalers: provide an itemised list with a quantity for each full designation. Include individual-box or bulk-packing requirements, labelling details and destination. If you need repeat supply, describe the expected ordering pattern.
Equipment manufacturers: include the drawing revision, working conditions and technical acceptance requirements. If the purchasing process requires sample approval, define the checks that must be completed before a production order.
Maintenance and replacement buyers: send the original bearing markings, equipment reference and required delivery date. State whether the existing specification must be matched exactly or whether an alternative may be submitted for approval.
Before placing an order, confirm the final specification, quantity, MOQ, delivery schedule, packaging and required documents in the quotation. Any proposed substitution should be reviewed before it is accepted into your purchasing system.
Can I replace an NU bearing with an NJ or NUP bearing of the same size?
Not on dimensions alone. The axial functions differ, so substitution requires a review of the shaft arrangement, operating conditions and relevant drawing. Retain the original complete designation when requesting a replacement.
Are cylindrical roller bearings supplied with seals and grease?
Many conventional separable designs are open bearings. Special sealed designs also exist. Specify the required sealing and lubrication arrangement and confirm the supplied condition for the exact reference; neither seals nor grease should be assumed from the category name.
Does an E suffix guarantee the same performance across brands?
Do not treat the suffix alone as a performance specification. Ask for the quoted manufacturer's definition and the data for that exact version. Dimensions, load ratings, cage design and operating limits should be compared using the relevant technical documents.
What should I check for double-row or four-row bearings?
Confirm the complete assembly reference, dimensions and required components. Include the equipment drawing, installation position and operating conditions. For a replacement, identify the existing assembly rather than submitting only a similar-looking catalogue number.
What quality documents should I request?
Specify the records needed by your procurement process, such as an approved drawing, dimensional inspection results, material information or traceability requirements. Agree which records are available for the quoted product and how they will be supplied before approving the order.
How can I confirm MOQ and lead time?
Send the full designation and quantity for each item. Ask the quotation to distinguish available stock from production and to identify any additional time for special specifications, inspection or packaging. Confirm the final schedule before placing an order.
Contact Nexans Bearing with your complete bearing references, quantities and delivery destination. For technical or replacement enquiries, include the equipment application and available drawings so the proposed specification can be checked against your purchasing requirements.
