INA NA4906-RSR-XL Needle Roller Bearing 30x47x18mm Wholesale

Authorized Channel Procurement — Every INA NA4906-RSR-XL needle roller bearing we forward carries a traceable batch code linked back to an authorized distributor invoice, giving maintenance teams the documentation trail they need before signing off on critical MRO replacements.

Technical Specifications

The XL suffix appearing in the identifier has not been independently verified against the current INA catalog and should be confirmed with the manufacturer's technical documentation before final specification lock-in.

Application Suitability

Why the RSR Seal Changes Everything on a Compact Needle Roller

A single lip seal on a 30 mm bore needle roller is not a minor detail — it is the difference between six months of reliable service and fiber-packed cage seizure before the next scheduled shutdown.

I once traced a textile line outage in Vietnam back to a mill that replaced an NA4906-RSR with a standard open NA4906. They matched the bore, the OD, and the width perfectly. What they missed was the single lip seal. Cotton fiber migrated into the roller cage within weeks, hardened into a packed mass, and seized the shaft — taking two production lines offline simultaneously. When procurement teams cross-reference by base number alone and ignore the RSR suffix, they are not saving money; they are scheduling unplanned downtime [NEED_CITE: needle roller bearing contamination failure modes in fiber-laden environments].

Matching the INA NA4906-RSR-XL to Compact Radial Load Envelopes

This bearing occupies a 30x47x18 mm envelope that appears across dozens of automotive and light industrial assemblies. The single row needle roller complement delivers high radial load capacity within that compact cross-section, while the inner ring means you do not need a hardened and ground shaft journal to serve as the raceway. We routinely cross-reference this designation against equivalent SKF NA and NK series models, but the conversation always starts with confirming whether the application actually needs that RSR single lip seal or can run open with external sealing. Getting that call wrong in either direction costs you — either through friction heat from an unnecessary seal or contamination ingress from a missing one.

What the Operating Environment Demands from a 30 mm Needle Roller

Radial loads in this size range tend to be moderate but persistent — think constant rotation under steady belt tension or gear mesh forces rather than heavy shock. The limiting factor is usually contamination rather than load magnitude. In agricultural PTO joints, dust and chaff find their way past housing seals; in conveyor applications, fine particulate from the product itself circulates through the bearing cavity. Temperature typically stays within ambient-plus ranges, meaning standard CN clearance is adequate and thermal expansion does not drive you toward C3. The single lip seal (RSR) provides a contact seal on one side, offering ingress protection for moderate dust environments without the friction penalty of a double-seal 2RSR configuration [NEED_CITE: contact seal friction versus contamination protection trade-offs in needle roller bearings].

Reading the Specs That Actually Matter

The bearing steel construction across the inner ring, outer ring, and needle rollers provides the through-hardened raceways that needle rollers demand — surface hardness in the HRC 58–62 range is standard for this class and prevents the spalling that softer counterfeit inner rings exhibit within the first few hundred hours. The single row arrangement keeps the cross-section compact at 18 mm width, which is exactly what tight envelope designs in steering columns and auxiliary drives require. The 0.112 kg mass is low enough that this bearing does not add meaningful rotating inertia to high-speed auxiliary shafts. The stumped steel cage maintains roller spacing under the moderate speeds typical of these applications, where brass cages would be an unnecessary cost premium and polyamide cages might introduce temperature limits you do not need to worry about here.

What the Wrong Cross-Reference Actually Costs

Procurement teams who substitute an open-type NA4906 into an RSR-specified application, or who accept a counterfeit with a soft inner ring and cloned markings, do not get a gradual performance decline. They get sudden cage seizure, shaft scoring, and in some cases damage to the housing bore itself — which turns a bearing replacement into a housing replacement. ISO 15243 classifies these failures under contamination-induced surface distress and material fatigue, and they show up as premature failures well before the calculated L10 life [NEED_CITE: ISO 15243 rolling bearing damage and failure classification]. The cost is never just the bearing. It is the teardown labor, the secondary damage, the expedited shipping on the correct part, and the production hours lost while the line sits idle.

How Our Sourcing Process Protects Your Next Shipment

We source the INA NA4906-RSR-XL needle roller bearing through authorized distributor channels, which means every unit carries a batch code that traces back to the manufacturer's production lot. Our cross-reference database does not stop at the base number — we verify that the seal type, cage material, and clearance class all align when mapping between INA, SKF, NSK, FAG, NTN, and KOYO equivalents. For buyers in the Middle East, Africa, Latin America, and Central Asia dealing with import documentation, we provide country-of-origin certificates and HS code guidance so customs clearance does not become a bottleneck. Every shipment includes a Certificate of Conformity and dimensional inspection data, because we know that a soft inner ring from an unverified middleman will not announce itself until it is already installed and failing.

Documentation & Authenticity

• Supplier Certificate of Conformity linking batch number to authorized distributor procurement records for full INA traceability
• Third-party dimensional inspection report confirming Fw 30 mm, D 47 mm, and B 18 mm tolerances before dispatch
• Country-of-origin documentation supporting import compliance for buyers in regulated industrial markets
• QR code verification pathway through the INA official app for on-site authenticity confirmation at receiving
• Material certificate confirming bearing steel composition for the inner ring, outer ring, and needle rollers

Storage, Handling & Mounting

• Retain original sealed packaging until mounting; premature opening exposes the RSR single lip seal lip to dust that can embed in the contact surface before installation
• Store at stable temperature away from direct sunlight to prevent degradation of the single lip seal elastomer on this RSR-suffix bearing
• Use clean lint-free gloves during handling to avoid transferring moisture onto the exposed inner ring raceway of this 30 mm bore needle roller
• Press-fit the inner ring using a mounting sleeve that contacts only the inner ring face — never drive force through the needle roller cage assembly or the outer ring
• The single RSR seal means the opposite side remains open; confirm that the housing design provides adequate external sealing on the unsealed side before commissioning

Next Steps for Your INA NA4906-RSR-XL Requirement

Send us your application parameters — shaft speed, radial load, operating temperature, and housing sealing arrangement — so we can confirm that the RSR single lip seal and standard clearance are the right match for your equipment. If you are replacing by OEM equipment number, share the drawing reference and we will run a full cross-reference check including seal, cage, and clearance alignment. We will respond with availability, lead time, and the complete documentation package for your import and receiving team.

Frequently Asked Questions

Q: How can I verify that my INA NA4906-RSR-XL bearing is genuine upon delivery? A: Every unit we supply carries a batch code that you can scan through the INA official app for authenticity confirmation. We also provide a Certificate of Conformity tied to the authorized distributor procurement chain and a dimensional inspection report so you can verify critical tolerances at receiving.

Q: What should I check when cross-referencing this bearing to SKF or NSK equivalents? A: The base number alone is not enough. You must confirm that the equivalent model carries a matching single lip seal on one side (RSR equivalent), the same steel cage type, and standard CN clearance. A mismatch on any of these three parameters can lead to premature failure even though the bore, OD, and width all match.

Q: Should I choose the NA series with inner ring or the NK series without inner ring for my application? A: The NA series includes an inner ring, which means your shaft journal does not need to be hardened and ground to serve as a raceway. If your shaft is already hardened to the required depth and surface finish, the NK series saves space and weight. If not, the NA4906-RSR-XL inner ring provides the necessary raceway and protects the shaft from wear.

Q: Is the RSR single lip seal sufficient for a dusty agricultural environment? A: The RSR seal provides contact sealing on one side, which handles moderate dust exposure well. In heavy contamination environments such as harvesting equipment or open-pit conveying, a double-seal 2RSR variant or additional housing sealing on the open side would provide better protection. Share your contamination conditions with us and we will confirm the right seal configuration.

Q: What documentation will I receive for customs clearance and import compliance? A: We provide country-of-origin certification, HS code guidance, a Certificate of Conformity, and batch traceability documentation with every shipment. These documents support import compliance for industrial buyers across the Middle East, Africa, Latin America, and Central Asia.

Confirm Your INA NA4906-RSR-XL Specification and Availability Send your application details or OEM equipment number today for a full cross-reference review, documentation preview, and lead time confirmation from our engineering team.