Find the Right Bearing Reference
Start with the original designation and then confirm the assembly details. The following references provide entry points into the catalogue; they are not an interchangeability table or a stock list.
Catalogue group | Example references | Purchasing checks |
Metric single-row bearings | 32309 | Complete designation, dimensions and required bearing arrangement |
Inch-series bearings | LM567949/LM567910; L44643/L44613 | Both component numbers, suffixes and complete assembly dimensions |
Double-row bearings | 352034 | Internal arrangement, spacers, assembly width and specified clearance |
Large-size inch-series bearings | LM281849/LM281810 | Approved drawing, component identification, handling and packing requirements |
If your reference is not shown, send it with the required quantity and application details for availability review. Include a clear photograph of the bearing markings when the original designation is difficult to read.
Single-Row and Double-Row Arrangements
A single-row tapered roller bearing carries radial load and axial load in one direction. Opposed bearings are commonly used when the arrangement must support axial forces in both directions. The cone assembly and cup are separable components.
Double-row designs provide a different assembly arrangement. Confirm the specific design, component orientation and any spacers against the drawing. Do not treat a double-row bearing as an automatic replacement for two independently selected single-row bearings.
The required arrangement depends on the equipment design. Send radial and axial load information, operating speed, temperature and lubrication conditions when requesting technical review. Where loads vary during operation, describe the duty cycle and any impact loading rather than relying only on a general application name.
Identify the Cone, Cup and Supply Unit
The cone is the inner-ring assembly with rollers and cage; the cup is the outer ring. Inch-series references commonly identify these components separately. Preserve both numbers and all suffixes in your inquiry.
State whether the requested quantity means complete bearings, individual cones, individual cups or complete multi-component assemblies. For example, a quotation for ten components is not necessarily a quotation for ten complete bearings.
For assemblies containing spacers or matched components, attach the assembly drawing and component list. Confirm the supplied contents on each quotation line. Similar component markings or matching main dimensions alone are insufficient to approve a replacement combination.
Check Dimensions and Bearing Setting
Compare the bore diameter, outside diameter and assembled total width using the drawing. For conventional single-row drawings, these are commonly identified as d, D and T. Cone width B and cup width C are separate measurements; do not substitute either for total width.
Keep the original metric or inch designation even if dimensions are converted for your purchasing system. State the units and avoid rounding dimensions used for technical acceptance.
Bearing setting refers to the endplay or preload in the mounted arrangement. Specify the required condition and acceptance method from the equipment drawing or installation procedure. Operating temperature and deflection can change the setting during service, so there is no universal adjustment value for every application.
For replacement work, include the original assembly specification where available. A bearing quotation should distinguish the supplied part configuration from the setting established during equipment assembly.
Prepare Your Tapered Bearing RFQ
A clear inquiry helps align the technical requirement with the quoted supply. For multiple items, send one line per bearing reference and keep each quantity linked to its required configuration.
RFQ field | Information to provide |
Identification | Complete bearing designation, suffixes, cone and cup references where applicable |
Supply scope | Complete bearing, component or assembly; required spacers and other included parts |
Technical basis | Drawing number and revision, dimensions, units and specified tolerances |
Application | Equipment model, installation position, operating conditions and replacement reference |
Bearing setting | Required clearance or preload information and the applicable acceptance procedure |
Quality requirements | Required inspection characteristics, documentation and traceability information |
Order details | Quantity per item, sample requirements and expected repeat demand |
Delivery requirements | Destination, requested date, marking, packaging and label requirements |
State any material standard or precision requirement explicitly. Ask for the available inspection and documentation scope at the quotation stage, particularly when supplier approval depends on specific records.
Confirm minimum order quantity, delivery timing and packing for the exact item. For large bearings, include any handling or protective-packing requirements in the inquiry. Private-label requests should identify the proposed markings, packaging artwork and quantity for review.
Frequently Asked Questions
