29320M Spherical Roller Thrust Bearing: Dimensions, Specifications, and Selection Guide
The 29320M is a spherical roller thrust bearing designed primarily to support heavy axial loads while accommodating some shaft misalignment. Its commonly listed nominal boundary dimensions are a 100 mm bore, 170 mm outside diameter, and 42 mm overall height. These dimensions are a starting point, not a complete fit decision: confirm the exact manufacturer drawing, load ratings, clearance, cage details, and operating limits before ordering.
This guide explains how to interpret the 29320M designation, check the main specifications, and assess whether this bearing suits your equipment. At Tuoda Bearing, we help B2B buyers compare application requirements with available bearing configurations and clarify the information needed for a quotation. If you are replacing an existing bearing, share its complete designation and equipment details rather than relying on the basic number alone.
Key Takeaways
- The commonly listed 29320M boundary dimensions are 100 mm × 170 mm × 42 mm (bore × outside diameter × height).
- It is an axial-load bearing with a spherical raceway arrangement that can accommodate limited misalignment; it is not a substitute for checking radial and combined-load requirements.
- The suffix “M” often identifies a machined brass cage, but suffix conventions can vary by manufacturer, so verify the catalog or drawing for the offered product.
- Before purchase, confirm load ratings, speed limits, lubrication, fit, mounting arrangement, and the supplier’s product documentation.
Who This Guide Is For
This guide is intended for purchasing teams, maintenance engineers, and equipment manufacturers sourcing a 29320M spherical roller thrust bearing. It is especially useful when you need to validate a replacement part, compare supplier quotations, or determine which technical details are still missing from a specification. If your application involves high loads, variable speeds, or restricted lubrication access, involve your bearing or equipment engineer in the final decision.
What Is a 29320M Spherical Roller Thrust Bearing?
A spherical roller thrust bearing uses rollers arranged to carry load mainly along the shaft axis. Its spherical raceway design allows the bearing to accommodate a degree of angular misalignment between the shaft and housing, subject to the manufacturer’s specified limits and the actual operating conditions. The rollers may also support a radial load component, but the bearing should be selected for the combined load rather than treated as a general-purpose radial bearing.
Understanding the Designation
“29320” identifies a bearing size series and bore code in common bearing designation systems, while “M” is commonly used by manufacturers to indicate a machined brass cage. Designation practices are not fully universal, and suffix meaning can differ between brands or product ranges. For that reason, use the complete supplier designation and its corresponding drawing or catalog entry when confirming interchangeability.
29320M Dimensions and Specification Checks
The table below gives commonly listed nominal boundary dimensions for the 29320 size. These are basic envelope dimensions only; they do not establish a bearing’s load capacity, precision class, internal clearance, or allowable speed. Always compare the values against the catalog or drawing for the exact brand and configuration being quoted.
| Parameter | Common nominal value | What to confirm |
|---|---|---|
| Bore diameter (d) | 100 mm | Shaft fit, shaft tolerance, and actual mounting arrangement |
| Outside diameter (D) | 170 mm | Housing space, housing fit, and adjacent-component clearance |
| Overall height (H) | 42 mm | Axial space, washer orientation, and stack-up dimensions |
Specifications Beyond the Envelope
Dimensional compatibility does not guarantee functional compatibility. Ask for the dynamic and static load ratings, reference and limiting speeds where applicable, tolerance class, cage description, and any specified clearance or preload condition. The values depend on the particular manufacturer and product configuration, so we do not recommend assuming them from the designation alone.
Also check lubrication requirements, operating temperature range, contamination exposure, and the method used to deliver lubricant. Grease and oil arrangements are not automatically interchangeable, and the appropriate choice depends on speed, load, sealing, and maintenance practice. Where the bearing will run under demanding conditions, provide the supplier with the operating data needed to assess the complete arrangement.
Materials and Configuration Options
The “M” suffix commonly refers to a machined brass cage, but the exact cage construction and suffix interpretation should be confirmed with the selected manufacturer. Other product variants may use different cage materials or design details, depending on the brand and series. A change in cage or internal design should not be treated as a drop-in substitution until dimensions, ratings, speed suitability, and operating conditions have been checked.
For a replacement purchase, record the brand, complete bearing marking, and any markings on the packaging or equipment documentation. If the original designation is unreadable, measurements alone may not identify the correct internal design. A photograph, application description, and the bearing’s duty information can help a supplier narrow down the suitable option.
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Application Matching and Selection Framework
The 29320M may be considered for machinery where substantial axial loading and some alignment accommodation are relevant, such as certain industrial gear, drive, or heavy-equipment arrangements. Suitability depends on the load direction, shaft orientation, speed, lubrication, and support structure rather than on the application label alone. Check the equipment manufacturer’s requirements before treating it as an approved replacement.
Step 1: Confirm the Load Conditions
Identify the axial load, any radial load, whether the load is steady or fluctuating, and whether shock or reversing loads occur. Compare these conditions with the bearing’s catalog ratings and the manufacturer’s selection guidance. If combined loading is significant, have the complete load case reviewed instead of comparing only one rating.
Step 2: Verify Fit and Installation
Check the shaft and housing dimensions, fits, shoulder geometry, axial location, and available installation space. Confirm the correct orientation of the shaft washer and housing washer, and follow the supplier’s mounting instructions. Incorrect fit or assembly can affect internal operating conditions even when the basic dimensions match.
Step 3: Review Speed, Lubrication, and Environment
Compare the expected operating speed with the specified limit for the exact bearing and lubrication arrangement. Consider temperature, moisture, dust, washdown, and the possibility of lubricant contamination. These factors may influence the choice of seals, lubricant, maintenance interval, or even the bearing arrangement.
Step 4: Check Interchangeability and Documentation
When changing brands, compare the full product specifications rather than just the 29320M designation. Request a drawing and confirm boundary dimensions, cage details, ratings, and applicable tolerances. For critical machinery, obtain approval from the equipment designer or responsible engineer before substituting a different configuration.
Pricing, MOQ, and Lead-Time Considerations
The price of a 29320M can vary with brand, manufacturing origin, material and cage configuration, order quantity, and documentation requirements. Minimum order quantity and lead time also depend on the supplier’s current stock and production schedule, so they should be confirmed with the quotation. A low unit price is not a complete comparison if the offer differs in specification, traceability, packaging, or delivery terms.
For an efficient quotation, provide the required quantity, destination, preferred brand or acceptable equivalent, target delivery date, and any inspection or document requirements. If you need a particular cage material, precision level, or operating specification, state it explicitly. This helps us assess the request accurately and reduces the risk of comparing non-equivalent offers.
Supplier Evaluation Checklist
- Can the supplier provide a drawing or catalog specification for the exact offered designation?
- Are the dimensions, cage description, load ratings, and relevant operating limits clearly stated?
- Can the supplier explain any difference between the requested product and the offered alternative?
- Are quantity, MOQ, lead time, packaging, and delivery terms specified in the quotation?
- Can the supplier clarify which quality or traceability documents are available for the order?
At Tuoda Bearing, we support B2B buyers with product specification checks and quotation discussions for bearing sourcing requirements. Share the complete designation, quantity, application, operating conditions, and destination so we can review the request and confirm what product information is available. We recommend resolving any mismatch in dimensions or operating requirements before placing an order.
Conclusion: How to Choose the 29320M
The 29320M is commonly listed with a 100 mm bore, 170 mm outside diameter, and 42 mm height, and is designed primarily for axial loading with some misalignment accommodation. Those dimensions can help you identify a potential match, but they do not confirm load capacity, speed suitability, or interchangeability. Verify the full specification against your machine’s requirements and the exact supplier documentation.
Your next step is to prepare the complete bearing marking, load and speed data, lubrication method, installation details, quantity, and delivery location. Send these details to Tuoda Bearing for a specification and quotation discussion. This information gives both sides a clearer basis for evaluating whether the 29320M is suitable for your application.