INA NK100/26-XL Needle Roller Bearing 100x120x26mm

Authorized Channels with Traceability — every INA NK100/26-XL shipment leaves with batch-level lot codes traceable back to the manufacturer's production facilities.

Technical Specifications

The -XL suffix indicates X-Life series designation per INA specifications; exact performance parameters should be confirmed against the current manufacturer catalog.

Application Suitability

What Happens When Shaft Hardness Falls Short on a Needle Roller Application

A soft shaft raceway destroys the bearing before the cage ever reaches its fatigue limit.

I've watched needle rollers score a shaft within weeks when surface hardness was below 58 HRC. The bearing itself was genuine, the cage intact, the clearance correct—yet the entire assembly failed. On an INA NK100/26-XL, where the inner ring is the shaft itself and the outer ring is absent, there is no forgiveness for inadequate shaft preparation. Counterfeit bearings with soft inner rings and cloned QR codes compound the problem: even experienced buyers pass visual inspection, only to see galling appear during commissioning [NEED_CITE: counterfeit bearing detection methods per ISO 15243 failure classification].

Where Compact Radial Sections Meet Real Load Demands

The INA NK100/26-XL eliminates both inner and outer rings, cutting the radial cross-section to its minimum while the full-complement needle elements carry heavy radial loads in a tight 100×120×26 mm envelope. This matters when a gearbox housing leaves barely 20 mm of radial wall between shaft and bore. Sourcing through our authorized distributor channels means the X-Life metallurgy and cage geometry arrive exactly as engineered—not as a soft-ring clone pulled from an unverified middleman.

Radial Shock, Low Speed, High Contamination

The applications that demand this bearing rarely run at high speeds; they face oscillating loads, intermittent shock, and heavy particulate contamination. Open-type needle bearings rely on the housing design for sealing, which shifts responsibility to the equipment builder to specify labyrinth seals or external lip seals appropriate for the environment. Lubrication must be managed externally—grease purging intervals depend on dust ingress rates, and oil bath designs need level controls to prevent churning losses [NEED_CITE: needle roller bearing lubrication intervals in contaminated environments]. Temperature swings affect the housing bore more than the shaft, so interference fits on the outer diameter must account for differential expansion without squeezing the needles against the cage.

Reading the Specs That Actually Matter Here

The absence of both rings means the shaft serves as the inner raceway and the housing bore as the outer raceway—surface finish, hardness, and roundness of both mating components directly determine bearing life. The cage separates the needles to prevent skewing under load; without it, needle-to-needle contact accelerates wear at higher speeds. Single-row construction concentrates load capacity into one plane, making alignment of the housing bore critical: even slight angular misalignment causes edge loading on the needles. The X-Life designation reflects optimized raceway geometry and surface finish that extend calculated L10 life compared to standard series bearings of the same envelope dimensions.

The Price Paid for a Wrong Cross-Reference

Swapping in a bearing that matches the base designation but carries the wrong cage material or clearance class leads to thermal binding in tight-envelope applications, or excessive play that hammers the needles into the cage pockets. When a counterfeit part enters the supply chain, the soft raceway material flakes under load, sending debris through the gearbox [NEED_CITE: rolling bearing failure mode classification per ISO 15243]. The failure is rarely blamed on the bearing itself—maintenance logs point to "overload" or "lubrication failure," while the real root cause was an unverified source. Unplanned downtime on a crusher or transmission rebuild far exceeds the cost of proper sourcing and shaft specification review.

How Verification Works on Every Order

We procure through authorized distributor channels, which means every INA NK100/26-XL arrives with batch-level lot traceability rather than a generic packing slip. Our cross-reference database aligns clearance, cage type, and precision suffixes—not just the base number—so substitution between brands is safe. QR code verification through INA's official apps confirms authenticity before the bearing leaves our inspection bench. For import buyers, country-of-origin documentation and HS code support are prepared with each shipment, eliminating customs delays. Shaft hardness specifications and mounting guidance are part of the technical conversation, not an afterthought.

Documentation & Authenticity

• Supplier Certificate of Conformity listing batch and lot numbers traceable to the INA production run
• QR code verification pathway confirmed via INA official apps before dispatch
• Material certificate showing bearing steel grade for raceway and cage components
• Third-party dimensional inspection report verifying Fw, D, and B tolerances against catalog values
• Country-of-origin documentation and HS code support prepared for import clearance

Storage, Handling & Mounting

• Keep the INA NK100/26-XL in its original sealed packaging; the open-type design means any surface corrosion on the needles or cage cannot be cleaned without risking particle contamination
• Verify shaft hardness reaches at least 58 HRC before mounting; the ringless design transfers all contact stress directly to the shaft raceway
• Use induction heating for the housing bore when pressing in the outer raceway surface; cold pressing risks cage deformation on this single-row needle configuration
• Apply the specified grease fill to the shaft and housing bore before installation, since the open type has no factory pre-fill or integrated seal
• Inspect the housing bore for roundness and surface finish per INA specifications; any out-of-round condition causes edge loading on the 100 mm bore needles

Request a Technical Review Before You Buy

Share your shaft hardness data, housing bore tolerances, and operating temperature range so we can confirm the INA NK100/26-XL is dimensionally and metallurgically correct for your application. If you're cross-referencing from another brand, provide the full designation including all suffixes so we can verify clearance and cage alignment. Ask for the documentation package—COC, material certificate, and origin papers—before the order ships.

Frequently Asked Questions

Q: How can I confirm the authenticity of an INA NK100/26-XL through official channels? A: Scan the QR code on the packaging using INA's official app, which links the batch and lot number to the manufacturer's production records. We also supply a Certificate of Conformity with traceable documentation from the authorized distributor channel.

Q: What parameters beyond the base designation must match when cross-referencing this needle roller bearing? A: Cage type, clearance class, and precision suffix all affect fit and field performance. Our cross-reference comparison aligns these three parameters across SKF, NSK, FAG, and other brands—not just the base number.

Q: What shaft hardness is required when mounting a needle roller bearing without an inner ring? A: The shaft raceway surface must reach a minimum of 58 HRC with appropriate surface finish. Soft shafts cause roller galling and premature raceway failure regardless of bearing quality.

Q: Can I get country-of-origin documentation for customs clearance? A: Yes, every shipment includes origin identification documents and HS code support suitable for import clearance in Middle East, Africa, and Latin American jurisdictions.

Q: What is the typical lead time for less common needle roller designations? A: Availability varies by batch cycle. We confirm stock and lead time at the quotation stage after verifying the exact suffix configuration against the current manufacturer catalog.

Confirm Your Application Fit Send your operating parameters or OEM equipment number, and we'll return a cross-reference review with full documentation details.