INA NK5/12-TV-XL Needle Roller Bearing with Polyamide Cage – Authorized Distributor

Verified via official app — Every INA NK5/12-TV-XL needle roller bearing we dispatch includes a scannable QR code linking directly to the manufacturer’s authentication database.

Technical Specifications

Note: The TV and XL suffixes are marked as unverified in the initial draft and require final confirmation against the manufacturer’s current catalog.

Application Suitability

When Compact Radial Spaces Cause Premature Spindle Seizure

Thermal binding in micro-shafts usually stems from cage friction, not inadequate load capacity.

In high-speed spindle applications, specifying a standard steel cage for a 5mm bore often leads to catastrophic thermal expansion. I once inspected a batch of needle rollers where the wrong cage material caused the assembly to shatter and lock the main shaft solid under continuous RPM. The INA NK5/12-TV-XL needle roller bearing addresses this exact failure mode by utilizing a polyamide cage that maintains dimensional stability and reduces friction heat at elevated rotational speeds [NEED_CITE: rolling bearing failure mode classification per ISO 15243].

Matching the Polyamide Cage to High-Speed Micro-Shafts

Selecting the correct cage material is the most critical decision for micro-bore applications. The polyamide configuration in this INA NK5/12-TV-XL needle roller bearing offers a noticeably lighter rotating mass compared to machined brass alternatives. This weight reduction minimizes centrifugal forces on the needle rollers, allowing the assembly to sustain higher limiting speeds while maintaining adequate lubrication film thickness in tight radial envelopes.

Navigating Thermal and Lubrication Constraints

Open-type needle rollers in compact gearboxes rely entirely on the surrounding system’s oil mist or splash lubrication. Without integrated seals, the bearing avoids the contact friction that generates excess heat, but it also demands a clean operating environment. If the application involves heavy particulate ingress, the lack of shielding means contamination will rapidly degrade the raceways. Proper filtration and consistent oil flow are mandatory to prevent abrasive wear on the bearing steel components [NEED_CITE: lubrication and contamination effects per ISO 281].

Decoding the Core Design Parameters

The 5mm bore and 10mm outside diameter create an exceptionally thin cross-section, demanding precise shaft and housing tolerances to prevent ovalization under load. The polyamide cage provides inherent self-lubricating properties that protect the needle rollers during brief starvation periods at startup. Furthermore, the X-life designation indicates optimized surface finishes on the rolling elements and raceways, which significantly lowers the friction coefficient and extends the fatigue life of the bearing steel under continuous radial loading.

The Hidden Costs of Ignoring Suffix Details

Purchasing a base designation without verifying the cage and internal design suffixes frequently results in unplanned downtime. Installing a metal-caged equivalent in a high-speed micro-motor will generate excessive heat, leading to premature failure and potential damage to the surrounding precision housing. According to industry failure analysis frameworks, a significant share of early bearing seizures originates from these subtle specification mismatches rather than fundamental design flaws [NEED_CITE: bearing damage analysis per ISO 15243].

Securing Your Supply Chain Against Counterfeits

Sourcing miniature bearings requires strict verification protocols to avoid cloned components with soft inner rings. We provide full batch traceability for every order, ensuring the polyamide cage material meets exact factory specifications. Our cross-reference process verifies not just the 5mm bore, but specifically aligns the TV and XL suffix requirements with your equipment’s thermal profile. We also support mixed-brand consolidation, allowing you to source this specific INA profile alongside other major manufacturer equivalents in a single shipment.

Documentation & Authenticity

• Certificate of Conformity confirming the specific polyamide cage material grade.
• Batch and lot traceability documents linking the 5mm bearings to the original production run.
• Official app QR verification codes printed on each individual packaging unit.
• Dimensional inspection reports validating the 10mm outside diameter tolerances.
• Material test reports verifying the bearing steel metallurgical composition.

Storage, Handling & Mounting

• Keep the open-type bearings in original packaging until installation to prevent dust ingress on the exposed needle rollers.
• Use clean, lint-free gloves when handling the 5mm bore to avoid moisture-induced corrosion on the bearing steel.
• Ensure the mating shaft surface hardness and roughness meet manufacturer specifications since this design operates without an inner ring.
• Apply the recommended system lubricant immediately after mounting to protect the polyamide cage and rolling elements.
• Store in a climate-controlled environment to prevent thermal degradation of the polyamide cage material before use.

Engineering Review and Selection Support

To ensure this bearing meets your exact operational demands, please provide your radial load profiles, operating speeds, and ambient temperature ranges. Our technical team will review these parameters to validate the L10 life calculation and confirm the suitability of the polyamide cage for your specific lubrication regime. If you are replacing an existing component, share the OEM equipment number so we can perform a comprehensive cross-reference check.

Frequently Asked Questions

Q: How do I verify the authenticity of the batch using the manufacturer’s tools?
A: Each package includes a unique QR code that links directly to the official brand application. Scanning this code confirms the production facility, batch number, and original specifications, ensuring the polyamide cage and bearing steel meet genuine factory standards without relying on visual inspection alone.

Q: Why is it critical to verify the TV and XL suffixes during cross-referencing?
A: Base dimensions alone do not guarantee operational success. The suffixes dictate the cage material and internal surface treatments. Substituting a steel-caged variant in a high-speed application will generate excessive friction heat, leading to rapid thermal binding and catastrophic spindle seizure.

Q: What are the selection boundaries for polyamide cages compared to metal alternatives?
A: Polyamide cages are optimized for high-speed, low-vibration environments where reduced weight and self-lubricating properties are essential. They are not suitable for applications involving extreme thermal exposure or heavy chemical solvents, where machined brass or pressed steel cages would be required.

Q: How should lubrication be managed for this open-type design?
A: Since the bearing lacks integrated seals, it relies entirely on the housing’s external lubrication system. You must ensure a continuous supply of clean oil or grease to the rolling elements, and establish regular re-lubrication intervals based on your specific operating speed and thermal conditions.

Q: What are the shaft requirements when operating without an inner ring?
A: The mating shaft acts directly as the inner raceway. Therefore, the shaft surface must be precision-ground to achieve the correct roughness profile and hardened to withstand continuous rolling contact fatigue, preventing premature wear on the needle rollers.