Description
Genuine INA Sourcing — Every INA NK80/35-XL needle roller bearing ships with full batch traceability and certificate of conformity through our authorized distributor network.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | INA NK80/35-XL |
| Bearing Type | Needle Roller Bearing |
| Bore Diameter (Fw) | 80 mm |
| Outside Diameter (D) | 95 mm |
| Width (B) | 35 mm |
| Weight | 0.4 kg |
| Cage Material | With Cage |
| Number of Rows | Single |
| Seal or Shield Type | Open |
| Style | Without Outer Ring, Without Inner Ring |
| Material | Bearing Steel |
| Load Direction | Radial |
The XL suffix in the INA NK80/35-XL designation indicates an extended-life series; specific X-Life performance parameters should be confirmed against the current INA catalog edition.
Application Suitability
| Industry | Typical Applications |
|---|---|
| Industrial Gearboxes | Heavy reduction gearbox intermediate shaft support |
| Material Handling | Conveyor drive reducer low-speed stage |
| Mining and Crushing | Crusher gearbox main shaft radial support |
| Steel and Metallurgy | Rolling mill gearbox pinion stand |
What Happens When a Needle Roller Cross-Reference Ignores the Cage
A dimensionally identical substitute with a mismatched cage design will fail under shock loading long before reaching its calculated L10 life.
I once received a failure report from a copper mine operation in northern Chile. The maintenance team had sourced a replacement needle roller bearing that matched the 80×95×35 envelope perfectly, but the cage was a welded steel design rather than the specified machined configuration. Within a matter of weeks, cage fragmentation caused roller skewing, uneven load distribution, and ultimately shaft scoring on the reducer gearbox. The downtime cost far exceeded any savings from the cheaper substitute. This is why cross-reference work must go beyond base numbers — cage type, roller profile, and internal geometry all affect field survival under heavy radial shock. [NEED_CITE: rolling bearing failure mode classification per ISO 15243]
Matching the INA NK80/35-XL to Gearbox Operating Conditions
Heavy reduction gearboxes impose continuous radial loads at moderate speeds, with shock spikes during startup and load reversal. The INA NK80/35-XL needle roller bearing addresses this through its cage-guided single-row configuration, which maintains roller alignment and prevents skewing under fluctuating torque. The 80mm bore without inner ring design assumes the shaft itself serves as the inner raceway — a requirement for compact gearbox layouts where envelope space is at a premium. Open-type construction allows direct oil splash or circulation lubrication from the gearbox sump, eliminating the re-lubrication constraints of sealed designs. When we evaluate substitutions for OEM equipment numbers, we verify not only dimensions but also cage material and roller profile to ensure the replacement survives the specific load spectrum.
Thermal, Load, and Lubrication Demands in Continuous-Duty Reducers
Reduction gearboxes in mining or steel mill service operate at sustained temperatures that affect lubricant viscosity and film thickness. Radial loads on intermediate shafts are predominantly steady with periodic shock from load cycling, demanding a bearing that distributes force uniformly across all needle rollers. Operating temperature rise also influences the effective internal clearance — a factor often overlooked when buyers assume standard clearance suits all applications. Oil lubrication in gearboxes typically provides adequate cooling, but contamination from gear wear debris can accelerate surface fatigue if filtration is inadequate. The open bearing design here means the gearbox housing and seals carry full responsibility for contamination exclusion. Mounting press-fit tolerances on the housing bore must be controlled to avoid ovality that would create edge loading on the needle rollers. [NEED_CITE: thermal effects on bearing internal clearance in industrial gearboxes]
Reading the Specs That Matter for This Needle Roller
The single-row needle roller configuration without inner or outer ring places specific demands on shaft and housing preparation. The shaft journal must be ground to the correct diameter and surface finish to function as the inner raceway — any deviation in roundness or roughness directly transfers to roller contact stress. The machined cage in this bearing retains roller spacing under radial load, preventing clustering that leads to uneven load sharing and localized overheating. Bearing steel construction with through-hardened rollers provides the contact fatigue resistance needed for sustained heavy radial duty. The 35mm width relative to the 80mm bore gives a compact cross-section, allowing designers to support substantial radial loads without increasing the gearbox housing diameter. X-Life designation from INA indicates optimized internal geometry, though application engineers should verify specific load rating improvements against the manufacturer’s current technical documentation.
The Downtime Multiplier from Unverified Substitutes
A counterfeit or incorrectly specified needle roller bearing does not simply wear faster — it fails unpredictably and often damages adjacent components. Cage collapse scatters rollers into the gear mesh, causing tooth pitting or complete gear seizure. Shaft scoring from roller skidding necessitates journal rework or shaft replacement, extending downtime from hours to weeks. Under ISO 281 life calculation frameworks, even minor deviations in roller profile or surface finish from specification can reduce calculated service life substantially, though the real-world consequence is usually sudden failure rather than graceful degradation. Procurement engineers who approve substitutes based on bore and width alone absorb these risks without realizing it until the gearbox is opened for inspection. [NEED_CITE: ISO 281 bearing life calculation methodology and influencing factors]
Why Maintenance Teams Verify Supply Chain Before Placing Orders
Every INA NK80/35-XL needle roller bearing we ship originates from authorized distributor channels with documentation linking the physical product to the manufacturer’s production batch. Our cross-reference database checks cage type, roller profile, and precision class — not just the bore, outside diameter, and width — before confirming interchange compatibility. When customers provide an OEM equipment number, we trace the original specification including any suffix requirements that affect internal geometry. Authenticity verification support includes guidance on using the official INA app QR code pathway to confirm the product matches the manufacturer’s records. Country-of-origin documentation accompanies each shipment for import compliance, and dimensional inspection reports are available to verify housing and shaft fit tolerances before mounting.
Documentation & Authenticity
- Supplier Certificate of Conformity with batch and lot traceability linking each INA NK80/35-XL to its production origin
- Material certificate confirming bearing steel grade for the needle rollers and cage components
- Dimensional inspection report verifying Fw 80mm, D 95mm, and B 35mm within specified tolerances
- Country-of-origin documentation for customs clearance and buyer verification at destination port
- QR code verification pathway guidance via official INA app for on-site authenticity confirmation
Storage, Handling & Mounting
- Retain the original sealed packaging until the moment of mounting; the open-type INA NK80/35-XL has no integrated seals, so early exposure to humid warehouse air promotes surface corrosion on the needle rollers
- Store flat in a temperature-stable environment; uneven thermal exposure across the 95mm outside diameter can induce subtle ovality in the cage that affects roller alignment during first startup
- Use clean lint-free gloves when handling the bearing; fingerprint residue on the 80mm bore surface acts as a stress riser once the shaft journal presses against it under radial load
- Verify shaft journal surface finish and roundness before pressing the needle roller assembly into position — the without-inner-ring design means the shaft itself is the raceway
- Confirm gearbox oil filtration adequacy before commissioning; the open construction of this single-row bearing allows gear wear debris direct access to the needle roller contact zone
Request a Technical Quotation
Share your application parameters — radial load, operating speed, gearbox oil type, and ambient temperature range — so we can verify the INA NK80/35-XL suitability and confirm lead time for your required quantity. If you are replacing an existing bearing by OEM equipment number, provide that reference so we can cross-check cage specification and internal geometry before quoting. Documentation packages including Certificate of Conformity and country-of-origin papers can be confirmed at the inquiry stage.
Frequently Asked Questions
Q: How can I verify the authenticity of an INA NK80/35-XL needle roller bearing after delivery?
A: Authenticity verification involves multiple checkpoints. Each bearing ships with batch and lot traceability documentation from the authorized distributor channel. The official INA app provides a QR code verification pathway that links the physical product to manufacturer records. We also supply dimensional inspection reports and material certificates so you can cross-check steel grade and physical dimensions against your acceptance criteria.
Q: What should I check when cross-referencing this bearing to an alternative brand?
A: A valid cross-reference must align more than the 80×95×35 dimensions. Cage material and design, roller profile (crowned versus straight), and precision class all affect performance in heavy reduction gearboxes. A dimensionally identical substitute with a different cage type may fail under shock loading. We maintain cross-brand interchange data across SKF, NSK, FAG, TIMKEN, NTN, and KOYO that includes these parameters, not just the base designation.
Q: Does the without-inner-ring design require special shaft preparation?
A: Yes. The shaft journal serves as the inner raceway, so it must be ground to the correct diameter, roundness, and surface finish. Any deviation in shaft geometry transfers directly to roller contact stress. We recommend verifying shaft tolerances against INA specifications before mounting, and we can provide guidance on acceptable surface finish ranges for needle roller contact.
Q: What lubrication approach is appropriate for this open-type needle roller bearing in a gearbox?
A: Open-type bearings rely entirely on the gearbox lubrication system — typically oil splash or forced circulation. The absence of seals or shields means the bearing benefits from continuous oil cooling and film replenishment, but it also means contamination control depends on gearbox filtration. Re-lubrication intervals follow the gearbox oil change schedule rather than independent bearing maintenance.
Q: What documentation is included with a bulk order for import purposes?
A: Bulk shipments include a Certificate of Conformity with batch traceability, material certificates, dimensional inspection reports, and country-of-origin documentation. HS code information and import support documentation are provided to facilitate customs clearance at the destination port. Specific document requirements for your importing country can be confirmed during the quotation stage.
Confirm Your INA NK80/35-XL Availability
Share your load, speed, and operating environment details along with required quantity, and we will return a technical quotation with confirmed lead time and documentation package scope.
