INA NK100/36-XL Needle Roller Bearing 100x120x36mm

Authorized Distributor Sourcing — Every INA NK100/36-XL ships with full batch traceability and QR verification pathway through the manufacturer's official application.

Technical Specifications

The XL suffix on this designation requires manufacturer catalog confirmation for precise classification.

Application Suitability

What Shaft Hardness Really Means for the INA NK100/36-XL Needle Roller Bearing

A soft shaft under a needle roller without inner ring will fail in weeks, not years.

When a needle roller runs directly on the shaft surface, that shaft becomes the inner raceway. In Riyadh, I watched a conveyor line go down during Ramadan peak production because someone fitted needle bearings without inner rings onto shafts that had never seen a case-hardening furnace. The rollers scored grooves into soft steel like a lathe tool. The entire line stopped, and the maintenance team spent three days pulling damaged components and sourcing emergency replacements. [NEED_CITE: needle roller bearing shaft hardness requirements per bearing manufacturer engineering guidelines]

That failure mode repeats across industrial sites where procurement matches the base designation but never asks about shaft surface preparation. The INA NK100/36-XL needle roller bearing demands a shaft surface hardened to appropriate depth with controlled surface finish, or the compact cross-section advantage becomes irrelevant within the first maintenance cycle.

Matching Compact Radial Capacity to Real Equipment Constraints

Equipment designers select needle roller bearings when envelope dimensions force a choice between radial load capacity and available cross-section. The INA NK100/36-XL needle roller bearing delivers that capacity within a 100×120×36 mm boundary, but the without-inner-ring configuration shifts responsibility for raceway integrity entirely to the equipment shaft. When we source these for maintenance engineers replacing OEM installations, we verify whether the original equipment manufacturer specified case-hardened shafts or whether field repairs have substituted untreated stock. That verification step prevents the exact failure mode that destroys production schedules.

Operating Loads and Lubrication Access in Continuous Duty

Radial loads on this bearing type concentrate along line contact between rollers and raceways, creating high Hertzian stress that demands adequate lubricant film thickness. Open-type construction means external lubrication systems must deliver grease or oil directly to the roller-raceway interface during operation or at scheduled maintenance intervals. Equipment running in contaminated environments requires external sealing solutions — the open bearing itself provides no contamination barrier, so housing seals and labyrinth arrangements carry that responsibility entirely. [NEED_CITE: needle roller bearing lubrication requirements under continuous radial loading]

Installation procedures also matter. Without an inner ring to handle separately, mounting involves pressing the outer ring and cage-roller assembly directly onto the prepared shaft, then into the housing bore. Interference fits must be calculated so the outer ring does not deform during pressing, and the shaft must be chamfered to guide rollers without edge damage during assembly.

Interpreting the Without-Inner-Ring Configuration

The absence of an inner ring on this designation is not a cost-saving omission — it is a deliberate engineering choice that reduces component count and allows the shaft itself to serve as the rolling surface. This configuration demands shaft hardness typically in the range of HRC 58-62 at the raceway surface, with controlled roughness to prevent accelerated roller wear. The trade-off is clear: you eliminate one component and gain compact assembly, but you accept full responsibility for shaft preparation quality. Maintenance teams replacing these bearings often discover that original shafts have been reground or replaced with untreated material during prior repairs, creating failure conditions that have nothing to do with bearing quality.

Cage Material and Speed Limitations

Cage design on needle roller bearings controls roller spacing and prevents roller-to-roller contact that generates heat and accelerates wear. Without explicit cage material specification on this designation, sourcing requires confirming whether the application demands pressed steel cages for standard speeds or machined cages for higher rotational velocities. The cage itself does not carry load, but cage failure immediately causes roller skewing, edge loading, and rapid raceway damage. [NEED_CITE: needle roller bearing cage failure modes per ISO 15243]

The Downtime Cost of Ignoring Shaft Preparation

Correct bearing selection paired with inadequate shaft preparation produces the same result as counterfeit components — premature failure that destroys production schedules and maintenance budgets. When a needle roller without inner ring operates on insufficiently hardened steel, the shaft surface develops spalling and grooving that propagates to cage fracture. Equipment stops unexpectedly, replacement bearings consume inventory, and emergency procurement pays premium pricing for expedited delivery. ISO 15243 classifies these failures under surface distress and wear, but the root cause traces back to shaft specification gaps during the original procurement cycle. [NEED_CITE: bearing failure classification and root cause analysis per ISO 15243]

Why Maintenance Engineers Source Through Our Supply Chain

We source the INA NK100/36-XL needle roller bearing through authorized INA distributor channels with full batch and lot traceability documentation. Every shipment carries a Certificate of Conformity linking the physical product to its production batch, and buyers can verify authenticity through the manufacturer's official QR code application. When maintenance engineers need cross-reference interchange to substitute equivalent designs during emergency procurement, our database matches on clearance class, cage material, and precision grade — not just the base number. For import buyers, we provide country-of-origin documentation and HS code support to clear customs without delays. Technical selection guidance includes shaft hardness verification for without-inner-ring configurations, preventing the exact failure mode that destroys conveyor lines during peak production periods.

Documentation & Authenticity

• Supplier Certificate of Conformity linking this specific INA NK100/36-XL batch to its production lot with full traceability chain
• QR code verification pathway through the official INA application for authenticity confirmation before installation
• Country-of-origin documentation package supporting import compliance and customs clearance procedures
• Third-party dimensional inspection report confirming bore diameter, outside diameter, and width tolerances before shipment
• Material certificate documenting steel grade and heat treatment specifications for the outer ring and needle rollers

Storage, Handling & Mounting

• Keep the INA NK100/36-XL in original sealed packaging until mounting day — the open-type construction means exposed rollers collect particulate contamination that acts as lapping compound during initial operation
• Verify shaft surface hardness at the raceway contact zone before pressing the outer ring onto the journal — insufficient hardness causes grooving that no bearing quality can compensate for
• Store horizontally in climate-controlled inventory with humidity below 60 percent to prevent corrosion on the exposed cage and roller assembly before installation
• Use clean gloves during handling to prevent fingerprint acids from initiating corrosion on the precision-ground outer ring raceway
• Confirm external sealing adequacy in the housing design — the open bearing provides zero contamination protection, making housing seals the only barrier against ingress
• Apply recommended grease packing volume during installation, as overfilling creates churning losses and temperature rise that accelerate lubricant degradation

Request Technical Review Before Committing to Bulk Procurement

Share your operating parameters — radial load magnitude, shaft speed, operating temperature range, and shaft hardness specification — so we can verify application suitability and confirm batch availability. If you are replacing OEM equipment, provide the original equipment number and we will cross-reference the exact configuration including any suffix variations that affect interchange compatibility. Request the documentation package in advance to confirm country of origin and lead time before issuing purchase orders.

Frequently Asked Questions

Q: How do I verify INA bearing authenticity using official QR code tools? A: Download the official INA application and scan the QR code printed on the bearing packaging and product marking. The application confirms whether the scanned code matches the manufacturer's database record for that specific batch and product designation, providing immediate counterfeit detection.

Q: When should I choose a needle bearing without inner ring versus one with an inner ring? A: Select the without-inner-ring configuration when the equipment shaft is already hardened and ground to appropriate raceway specifications, and when compact cross-section is critical. Choose bearings with inner rings when shaft hardness is inadequate or when maintenance procedures require separate shaft and bearing replacement without disturbing the raceway surface.

Q: What parameters must match beyond the base designation when cross-referencing INA NK series bearings? A: Beyond the base number, you must verify clearance class, cage material and design, precision grade, and whether the application requires an inner ring. Matching only the base designation while ignoring these parameters causes premature failure from thermal binding, cage fracture, or inadequate load capacity.

Q: What are the shaft hardness and surface finish requirements for needle bearings without inner ring? A: The shaft surface serving as the raceway typically requires hardness in the HRC 58-62 range with controlled surface roughness. Soft shaft material develops grooving under needle roller contact stress, causing premature failure regardless of bearing quality.

Q: What lubrication approach is recommended for open-type needle roller bearings in continuous-duty applications? A: Open-type bearings require external lubrication systems that deliver grease or oil directly to the roller-raceway interface at intervals matched to operating speed and temperature. Housing sealing design must prevent contamination ingress, as the bearing itself provides no sealing function.

Secure Your INA NK100/36-XL Supply With Verified Documentation Send your application parameters and equipment identification number to initiate technical review, cross-reference verification, and batch availability confirmation. Contact our sourcing team through authorized channels to request the full documentation package before committing to procurement.