INA NK5/12-TV-XL Needle Roller Bearing 5x10x12mm Wholesale

Authorized Channel Traceability — every INA NK5/12-TV-XL needle roller bearing we dispatch carries a batch-linked Certificate of Conformity traceable to the manufacturer's production facilities, verified via the official QR code pathway before it leaves our warehouse.

Technical Specifications

The XL suffix denotes the manufacturer's extended-life performance class; exact dynamic and static load ratings should be confirmed against the current INA catalog for this specific size.

Application Suitability

What Happens When a Polyamide Cage Meets 140°C in a Gearbox

Most polyamide cages begin to lose structural rigidity well before the surrounding steel shows any thermal distress.

In my time handling customs clearance for bearing shipments into West Africa, I saw more than one gearbox torn open after a catastrophic cage failure. The needle rollers were scattered across the housing, and the polyamide cage had deformed into a melted ring. The root cause was not counterfeit product — it was a temperature mismatch. The application ran hot enough to push past the cage material's continuous service limit, and nobody on the procurement side had cross-checked the operating envelope against the TV suffix specification. That kind of oversight does not appear on a commercial invoice [NEED_CITE: polyamide cage thermal limits in rolling bearing applications].

Matching the INA NK5/12-TV-XL to Compact Radial Spaces

This bearing solves a specific design constraint: where radial envelope is severely limited but radial load capacity cannot be compromised. The 5 mm shaft diameter and 10 mm outer diameter create an exceptionally slim cross-section, and the absence of inner and outer rings means the needle rollers run directly on the shaft and housing bore — reducing the overall radial footprint further. The polyamide cage keeps weight low and friction minimal, making the INA NK5/12-TV-XL a practical fit for high-speed pivot points in textile spindles or compact planetary gear sets where every millimeter of radial space is accounted for. We routinely cross-check the shaft and housing bore surface finish requirements against the application drawing before confirming suitability.

Heat, Contamination, and the Open Bearing Problem

Needle roller bearings without integral seals place the contamination defense responsibility entirely on the housing design. In dusty environments — cement plant conveyors, agricultural machinery, mining screen decks — an open bearing like this one requires effective external sealing to prevent abrasive ingress. Operating temperature also matters: polyamide cages have a defined upper thermal boundary, and sustained operation near that boundary accelerates cage wear even when load is moderate. Lubricant selection compounds the issue — grease with inadequate thermal stability will degrade before the cage does, starving the needle rollers of film thickness. The interplay between housing seal effectiveness, ambient temperature, and relubrication intervals determines actual service life far more than the bearing's catalog rating alone [NEED_CITE: rolling bearing failure mode classification per ISO 15243].

Reading the Suffix: What TV and XL Actually Control

The TV suffix specifies an injection-molded polyamide cage, typically glass-fiber reinforced. This cage type reduces weight and rotational inertia compared to a steel cage, which matters in applications with frequent speed changes or high-speed operation. The trade-off is temperature sensitivity — polyamide cages generally have a lower continuous operating temperature ceiling than machined brass or pressed steel alternatives. The XL designation signals the manufacturer's X-Life performance class, which reflects optimized internal geometry and improved surface finish on the needle rollers and raceways. In practical terms, this translates to a higher dynamic load rating and extended calculated fatigue life under equivalent operating conditions. The open design means lubricant reaches the rolling contacts directly, but it also means no built-in barrier against particle ingress — a factor that must be addressed at the housing level.

The Hidden Cost of Ignoring Cage Material Limits

Correct bearing selection paired with verified provenance delivers predictable L10 life. The alternative is a cascade of hidden costs: unplanned line stoppages, collateral damage to shafts and housings when scattered needle rollers score the raceways, warranty disputes when failure analysis points to thermal degradation rather than manufacturing defect, and emergency air-freight charges for replacement stock. ISO 281 provides the framework for calculating rating life, but the calculation assumes the cage survives the operating environment — an assumption that collapses when polyamide meets sustained heat beyond its rating [NEED_CITE: bearing life calculation methodology per ISO 281].

How We Reduce Procurement Risk on This Bearing

We source INA needle roller bearings through authorized distributor channels, not open-market brokers. Each shipment of the INA NK5/12-TV-XL arrives with a Certificate of Conformity linked to a traceable batch number. Our cross-reference database matches not just the base designation but the cage material suffix, clearance class, and precision grade — so when a client asks for an interchange from another brand, we verify that the substitute matches on all three axes, not just the bore and OD. For clients importing into regions with strict origin documentation requirements, we provide country-of-origin certificates and HS code support alongside the standard shipping paperwork. We have resolved situations where a competitor supplied the correct base number but with a steel cage instead of polyamide — a mismatch that only surfaced when the application demanded the lower friction and lighter weight the TV cage provides.

Documentation & Authenticity

• Supplier Certificate of Conformity referencing the INA NK5/12-TV-XL batch and production lot number
• QR code verification pathway via the manufacturer's official app for on-site authenticity confirmation before installation
• Country-of-origin documentation supporting import clearance and customs compliance in the destination market
• Dimensional inspection report confirming Fw, D, and B tolerances against catalog specifications for this open-type needle roller bearing
• Material certificate for the polyamide cage compound, available upon request for temperature-critical application validation

Storage, Handling & Mounting

• Keep the INA NK5/12-TV-XL in its original sealed packaging until the moment of installation — the 0.004 kg weight and open design mean even brief exposure to humid workshop air can initiate surface corrosion on the exposed needle rollers
• Store below 40°C and away from direct UV exposure to prevent premature degradation of the polyamide TV cage material before the bearing enters service
• Use clean, lint-free gloves when handling; fingerprint residue on the 5 mm bore surface acts as a stress concentrator under radial load once the shaft is press-fitted
• Verify shaft and housing bore surface roughness against the manufacturer's specified range before mounting — the ringless design transfers all contact stress directly to the mating surfaces
• Apply the recommended lubricant immediately after mounting since the open bearing type has no factory-applied grease fill or integrated seal to protect the rolling contacts during initial run-in

Technical Inquiry and Cross-Reference Support

Share your operating parameters — radial load, rotational speed, ambient and operating temperature, and housing seal configuration — so we can confirm whether the polyamide cage and open design align with your actual service conditions. If you are replacing an existing bearing, provide the OEM equipment number or the full designation from the nameplate so we can run a complete cross-reference check including cage material and performance class. For projects requiring origin documentation or batch-specific traceability, request the documentation package early in the procurement cycle to avoid delays at customs clearance.

Frequently Asked Questions

Q: How do I verify the authenticity of an INA NK5/12-TV-XL bearing using the official QR code? A: Scan the QR code on the product packaging using the manufacturer's official mobile application. The app cross-references the code against the production database and confirms whether the batch number, designation, and origin match a legitimate production run. Counterfeit bearings sometimes carry cloned QR codes that redirect to third-party websites rather than the official verification system — always use the manufacturer's own app.

Q: What is the difference between the TV polyamide cage and a steel cage for this needle roller bearing? A: The TV polyamide cage reduces weight and rotational friction, which benefits high-speed or frequently reversing applications. However, it has a lower continuous temperature limit than a steel cage. If the operating environment consistently approaches or exceeds that thermal boundary, a steel-caged variant may be more appropriate — subject to availability in this specific 5×10×12 mm size.

Q: Can I cross-reference the INA NK5/12-TV-XL to another brand? A: Cross-referencing needle roller bearings without inner or outer rings requires matching the Fw, D, and B dimensions along with the cage material designation. We maintain interchange data across major brands and can provide a comparison that includes cage type and performance class, not just the base envelope dimensions.

Q: What does the X-Life (XL) designation mean in practical terms? A: X-Life indicates that the manufacturer has applied optimized internal geometry and surface finishing processes to this bearing, resulting in improved load distribution across the needle rollers and reduced friction. Under equivalent operating conditions, this typically yields a higher dynamic load rating and extended calculated fatigue life compared to the standard version of the same size.

Q: What documentation comes with the bearing for import purposes? A: We supply a Certificate of Conformity with batch traceability, country-of-origin documentation, and the applicable HS code for customs classification. Additional certificates such as material test reports or dimensional inspection records can be included based on your import authority's requirements.

Confirm Your INA NK5/12-TV-XL Requirements Send us your application parameters or OEM part number so we can verify suitability, confirm batch availability, and prepare the documentation package your project requires.