Description
Authorised Channel Sourcing — Every INA NK80/25-XL leaves a Schaeffler-authorised distributor with full batch traceability back to the production lot.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | INA NK80/25-XL |
| Bearing Type | Needle Roller Bearing (without inner ring, without outer ring) |
| Bore Diameter (Fw) | 80 mm |
| Outside Diameter (D) | 95 mm |
| Width (B) | 25 mm |
| Dynamic Load Rating (Cr) | Source value — verify against current INA catalogue |
| Static Load Rating (C0r) | Source value — verify against current INA catalogue |
| Limiting Speed | Source value — verify against current INA catalogue |
| Weight | 0.28 kg |
| Cage Material | Unverified suffix — confirm cage type and material against manufacturer catalogue before final selection |
| Seal or Shield Type | Open |
| Clearance Class | Standard (verify application-specific requirement) |
| Precision Class | ISO 492 Normal Class |
| Origin | Germany / Schaeffler global production network |
Note: The cage material designation for this specific INA NK80/25-XL batch requires confirmation against the manufacturer’s current catalogue or direct technical inquiry to ensure compatibility with your operating speeds and lubrication regime.
Application Suitability
| Industry | Typical Applications |
|---|---|
| Industrial Machinery | Heavy-duty gearbox intermediate shafts, planetary gear carriers |
| Material Handling | Conveyor drive drum bearings, bucket elevator head shafts |
| Mining and Crushing | Vibrating screen exciter mechanisms, crusher main shaft support |
| Steel and Metallurgy | Rolling mill guide rollers, continuous caster segment rolls |
| Agricultural Machinery | Combine harvester rotor drive shafts, baler gearbox support |
The Hidden Risk in Thin-Section Needle Roller Substitution
A base number match means nothing when the cage material is wrong.
I’ve seen it happen more than once: a maintenance team sources what looks like the correct needle roller bearing for a gearbox rebuild, the dimensions check out perfectly, and the machine runs fine for a few weeks. Then the cage disintegrates under sustained torque. The root cause is almost always a suffix or cage specification that was never cross-checked. In thin-section needle roller bearings like the INA NK80/25-XL, there is minimal envelope space to absorb the consequences of a material mismatch [NEED_CITE: rolling bearing failure mode classification per ISO 15243]. Counterfeit units with soft rollers and cloned markings compound this risk, entering supply chains through unverified middlemen and causing shaft scoring that turns a simple bearing swap into a full housing replacement.
How the INA NK80/25-XL Fits Compact Gearbox Envelopes
The INA NK80/25-XL is designed for applications where radial space is severely constrained. Without an inner or outer ring, the rollers run directly on a hardened shaft journal and a hardened housing bore, which means the cross-section is reduced to just the needle roller complement and cage assembly. This is exactly what heavy-duty gearboxes demand: maximum load capacity within the tightest possible envelope. We routinely cross-reference OEM equipment numbers against the INA NK80/25-XL to confirm that the shaft hardness and surface finish meet the requirements for direct-raceway operation, because a soft shaft will destroy even a genuine X-Life bearing in short order.
Load Spectrum, Speed, and Lubrication Demands
Needle roller bearings in gearbox applications typically carry high radial loads at moderate speeds, with occasional shock loading during startup or direction reversal. The open design of the INA NK80/25-XL means lubrication is the responsibility of the gearbox oil bath or circulating system, which is standard practice in enclosed industrial gearboxes. Temperature management matters here: sustained operating temperatures affect both the lubricant film thickness and the internal clearance of the bearing. Thermal expansion of the shaft and housing must be accounted for during the original design stage, and replacement bearings must match the clearance class specified by the OEM [NEED_CITE: thermal expansion effects on bearing internal clearance]. Incorrect clearance selection — installing a standard CN clearance where a C3 was specified — is a recurring cause of premature failure in rebuilt gearboxes.
Decoding the X-Life Designation
The XL suffix on the INA NK80/25-XL indicates Schaeffler’s X-Life series, which represents an optimised internal geometry and improved surface finish of the rolling elements and raceways. In practical terms, this means the bearing achieves a higher dynamic load rating and an extended calculated L10 life compared to the standard NK series of the same dimensions. The improved roller profile distributes contact stress more evenly across the raceway, reducing edge loading that typically accelerates fatigue in thin-section needle roller bearings. For gearbox applications where the bearing is buried deep inside a housing and replacement requires significant labour, the X-Life upgrade delivers meaningful maintenance interval extension without any dimensional change.
What a Wrong Specification Actually Costs
Correct specification and verified sourcing are not just quality preferences — they are cost controls. A needle roller bearing that fails prematurely inside a gearbox triggers unplanned downtime, emergency freight charges for replacement parts, and potentially catastrophic damage to adjacent gears and shafts if the cage fragments migrate through the lubrication system. ISO 281 provides the framework for calculating bearing life, but that calculation assumes genuine components operating within their specified parameters [NEED_CITE: ISO 281 bearing life calculation framework]. A counterfeit bearing or one with an incorrect cage material voids any reasonable life prediction. The financial exposure extends far beyond the bearing’s purchase price.
Sourcing Verification Without the Guesswork
We source the INA NK80/25-XL through authorised Schaeffler distributor channels, which means every unit ships with documentation that traces back to the production batch. Our cross-reference database covers clearance, cage material, and precision suffixes — not just the base designation — so when a maintenance engineer sends us an OEM equipment number, we verify the full specification before quoting. We provide country-of-origin documentation for import clearance, and every bearing can be verified through the official INA app QR code pathway. For buyers managing multi-brand inventories across six major bearing manufacturers, we maintain interchange charts that match on all critical suffixes, preventing the kind of partial-match errors that cause field failures.
Documentation & Authenticity
- Supplier Certificate of Conformity issued against the specific INA NK80/25-XL batch number, confirming shipment from an authorised distribution channel
- Batch and lot traceability documentation linking each bearing to its production date and Schaeffler manufacturing facility
- QR code verification pathway via the official INA app, allowing on-site authenticity confirmation before installation
- Country-of-origin certificate prepared for import documentation and customs clearance in destination markets
- Third-party dimensional inspection report covering Fw, D, and B tolerances available upon request for critical applications
- HS code and import support documentation specific to needle roller bearings for smooth customs processing
Storage, Handling & Mounting
- Keep the INA NK80/25-XL in its original sealed packaging until the moment of installation; the open design means any contamination on the rollers or cage goes directly into the gearbox oil system
- Store in a climate-controlled environment with stable temperature to prevent condensation inside the packaging, which can cause corrosion on the precision-ground needle rollers before the bearing ever reaches the shaft
- Handle with clean, lint-free gloves during mounting — the 80mm bore diameter and thin cross-section mean fingerprints on the rollers can initiate corrosion pits that propagate under load
- Verify shaft journal hardness and surface finish before installation; the INA NK80/25-XL runs directly on the shaft without an inner ring, so a soft or rough journal will cause rapid roller wear regardless of bearing quality
- Ensure the gearbox oil system is flushed and filled with the correct specification lubricant before first start-up, as the open bearing design depends entirely on the external lubrication system
Engineering Support for Your Next Requirement
Share your application parameters — load, speed, operating temperature, and lubrication type — and we will verify that the INA NK80/25-XL is the correct specification for your specific gearbox or provide a technically matched alternative. If you are replacing a bearing identified by OEM equipment number rather than bearing designation, send us the number and we will run a full cross-reference check including clearance and cage verification. Request the documentation package and country-of-origin confirmation before placing your order so that import clearance proceeds without delay.
Frequently Asked Questions
Q: How do I verify that an INA NK80/25-XL is genuine before installation?
A: Every genuine INA bearing carries a QR code that can be scanned through the official INA app, linking the physical unit to Schaeffler’s production database. We also provide batch traceability documentation and a Certificate of Conformity that confirms the authorised distribution chain from manufacturer to your facility.
Q: What does the X-Life (XL) suffix mean for needle roller bearing performance?
A: The XL suffix indicates Schaeffler’s X-Life series, which features optimised internal geometry and improved surface finish on the rolling elements and raceways. This results in higher dynamic load capacity and extended calculated service life compared to the standard NK series, without any change in envelope dimensions.
Q: How do I select the correct clearance for a needle roller bearing in a gearbox?
A: Clearance selection depends on operating temperature, shaft and housing material expansion coefficients, and the interference fit used during mounting. We review your application parameters — including sustained operating temperature and mounting method — to confirm whether standard clearance or an increased clearance class is required for your specific gearbox.
Q: What are the mounting requirements for a needle roller bearing without an inner or outer ring?
A: The INA NK80/25-XL requires the shaft journal and housing bore to serve directly as raceways. This means both surfaces must be hardened to the manufacturer’s specified hardness range and ground to the correct surface finish and geometric tolerance. We can provide the specific shaft and housing requirements for your application upon request.
Q: Can I cross-reference the INA NK80/25-XL with bearings from other brands?
A: Yes, we maintain cross-reference charts covering SKF, NSK, FAG, TIMKEN, NTN, and KOYO, matched on clearance, cage material, and precision suffixes — not just the base number. Send us your requirement and we will provide a verified interchange comparison.
Confirm Your INA NK80/25-XL Specification and Availability
Send us your application parameters or OEM equipment number for a verified technical match, full documentation package, and current lead time confirmation.
