INA NA4907-RSR-XL Needle Roller Bearing 35x55x21mm Genuine

Authorized channel procurement — Every INA NA4907-RSR-XL needle roller bearing we ship carries a traceable Certificate of Conformity linked to its production batch, so you can verify origin before it ever reaches your storeroom.

Technical Specifications

The XL suffix appears on INA packaging and datasheets for X-life series bearings; cage material and exact dynamic/static load ratings for this specific variant should be confirmed against the current manufacturer catalog before finalizing procurement.

Application Suitability

What a Missing Seal Costs on a Needle Roller That Size

An open needle roller in a dusty environment will fail before the grease does — the cage fills first.

I once traced a recurring packaging line failure back to a bearing cross-reference that matched the base number perfectly but shipped open where a sealed RSR was spec'd. Flour dust packed the needle cage within weeks, grease turned to paste, and the inner ring scored itself beyond recovery. The INA NA4907-RSR-XL needle roller bearing avoids that failure mode entirely because the single lip seal keeps contamination out while still allowing the low-friction rotation that needle rollers are known for. When you substitute without checking seal type, you are not just swapping a part number — you are changing the bearing's relationship with its environment [NEED_CITE: needle roller bearing contamination failure modes per ISO 15243].

Where a 35mm Sealed Needle Roller Actually Earns Its Place

The 35×55×21mm envelope sits at a threshold where radial space is tight but loads are no longer light. Material handling pivots, small gearbox idler positions, and agricultural linkage joints all share one trait: the housing is bored to accept an outer ring, but the shaft itself is not hardenable to serve as a raceway. That is exactly where an integrated inner ring matters — the INA NA4907-RSR-XL needle roller bearing carries its own inner race, so the mating shaft does not need induction hardening or precision grinding. We routinely cross-reference OEM equipment numbers against this format and confirm seal type before quoting, because matching the base number alone has burned too many buyers before.

Load Patterns and Contamination That Decide Service Life

Needle rollers in this size range handle substantial radial loads relative to their cross-section, but they have almost zero axial capability. Applications with any thrust component — even the slight axial drift of a conveyor roller under belt tension — need that addressed elsewhere in the design. Temperature swings in outdoor agricultural equipment cause grease migration, and the single lip seal on the RSR variant keeps the factory charge where it belongs. The trade-off is real: contact seals add friction, but in environments where particulate ingress is the primary failure driver, that friction is a small price against premature cage collapse [NEED_CITE: radial needle roller bearing thermal limits with contact seals].

Why the Inner Ring and Single Lip Seal Define This Bearing

The integrated inner ring on the NA series is not a convenience feature — it is a design requirement for shafts that cannot serve as raceways. Without it, you would need a separate IR inner ring, which adds an assembly step and a press-fit tolerance stack that can distort the needle cage clearance. The RSR single lip seal contacts the inner ring OD with enough interference to block dust and moisture without generating the heat that a double lip seal would in continuous rotation. The XL designation signals the X-life series, which in INA's catalog corresponds to optimized raceway surface geometry and higher load capacity compared to legacy production — a meaningful difference when you are sizing for L10 life in a radial-only application where every millimeter of cross-section counts.

The Downtime That Follows a Shortcut Cross-Reference

Substituting an open-type needle roller where a sealed unit was specified, or ignoring inner ring presence, does not just shorten service intervals — it introduces failure modes that maintenance teams do not anticipate. A scored shaft from a missing inner ring means machining or replacement. Contamination-driven cage failure in an open bearing shows up as vibration spikes that operators mistake for imbalance, triggering unnecessary rotor teardowns. Per ISO 281, bearing life calculations assume adequate sealing as a baseline condition; when the actual installation falls short of that assumption, the calculated L10 hours become meaningless [NEED_CITE: bearing life modification factors per ISO 281 related to sealing effectiveness]. Procuring the correct sealed variant with verified documentation prevents these cascading costs.

How Verification Works When You Source Through Us

We source INA needle roller bearings through authorized distributor channels, which means every shipment carries batch-level traceability from the manufacturer's production facilities. Our cross-reference process does not stop at matching the base designation — we confirm inner ring presence, seal type, and cage specification before any quote is finalized. For buyers managing imports, we provide country-of-origin documentation and HS code classification so that customs clearance does not become a second procurement problem. The Certificate of Conformity travels with the batch, and dimensional inspection can be arranged through third-party labs before the goods leave our warehouse. If a counterfeiting concern arises, we guide clients through the manufacturer's official QR verification pathway so that authenticity is resolved before installation.

Documentation & Authenticity

• Supplier Certificate of Conformity referencing the specific production batch and lot number for each INA NA4907-RSR-XL needle roller bearing shipment
• Third-party dimensional inspection report verifying bore, OD, and width tolerances against ISO 492 references before dispatch
• QR code verification pathway through the manufacturer's official app, confirming authenticity at the unit level upon receipt
• Country-of-origin certificate suitable for import documentation in markets requiring proof of manufacturing origin
• Material test certificate available for the bearing steel grade used in the integrated inner ring and needle rollers

Storage, Handling & Mounting

• Keep the INA NA4907-RSR-XL in its original sealed packaging until the moment of installation — the single lip RSR seal protects against contamination in service, but the bearing surface is vulnerable to humidity during unprotected storage
• Handle with clean, lint-free gloves to avoid transferring skin oils onto the 35mm bore or 55mm outer ring, which can compromise the initial grease film before the seal is ever tested
• Press-fit the integrated inner ring onto the shaft using a mounting sleeve that contacts only the inner ring face — applying force through the needle cage or outer ring will damage the single row needle assembly
• Do not wash or degrease the bearing before installation; the factory grease fill behind the RSR single lip seal is calculated for the bearing's service life, and introducing solvent past the seal lip will dissolve it
• Store horizontally in a dry environment below 60% relative humidity; the 0.176kg weight is small enough that vertical stacking will not deform the packaging, but prolonged upright storage can shift grease away from the upper needle elements

Request a Technical Review Before You Commit

Share your application parameters — radial load, operating speed, ambient temperature, and contamination exposure — so we can confirm whether the INA NA4907-RSR-XL needle roller bearing is the correct sealed variant for your equipment. If you are replacing an existing bearing by OEM equipment number, send us the nameplate data and we will cross-reference the full specification including seal type and inner ring configuration. Documentation packages with batch traceability and country-of-origin certification can be prepared before you issue a purchase order.

Frequently Asked Questions

Q: How can I verify that an INA NA4907-RSR-XL needle roller bearing is genuine after delivery? A: Genuine INA bearings carry a QR code that links to the manufacturer's official verification app. Scanning the code confirms the batch and production origin. We also provide a Certificate of Conformity with lot traceability, and third-party inspection reports are available on request for additional verification before installation.

Q: What should I check when cross-referencing this needle roller bearing to another brand? A: Beyond the base designation, confirm that the substitute includes an integrated inner ring, the same single lip RSR seal type, and matching radial clearance. Substituting an open-type or unsealed variant in a contaminated environment will dramatically shorten service life regardless of dimensional compatibility.

Q: When should I choose a needle roller bearing with an integrated inner ring versus one without? A: Use a bearing with an integrated inner ring — like the NA series — when the shaft cannot be hardened and ground to serve as a raceway. The RNA series omits the inner ring for applications where the shaft itself is prepared to act as the rolling surface, which saves radial space but requires more demanding shaft preparation.

Q: Is the single lip RSR seal sufficient for high-dust environments like agricultural or mining equipment? A: The RSR single lip seal provides reliable protection against typical dust and moisture ingress in most industrial and agricultural applications. In extremely abrasive or wet environments, supplementary external sealing at the housing level is recommended to reduce the contamination load reaching the bearing seal face.

Q: What documentation do I need for importing this bearing into my market? A: We provide country-of-origin certificates, HS code classification, and material certificates with each shipment. The specific import documentation requirements depend on your destination market, and we can prepare the full package to match your customs broker's requirements before dispatch.

Confirm Your Specification Before You Procure Send us your equipment nameplate number or application parameters, and we will return a cross-reference with full seal, inner ring, and clearance verification — along with a documentation package tailored to your import requirements.