Description
Authorized Channel Sourcing — Every INA NK110/40-XL needle roller bearing we supply ships with batch-level traceability documents tied directly to Schaeffler’s authorized distributor network, not secondary market gray stock.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | INA NK110/40-XL |
| Bearing Type | Needle Roller Bearing |
| Bore Diameter (Fw) | 110mm |
| Outside Diameter (D) | 130mm |
| Width (B) | 40mm |
| Weight | 0.82kg |
| Seal or Shield Type | Open |
| Number of Rows | Single Row |
| Style | Without Outer Ring, Without Inner Ring |
| Material | Bearing Steel |
| Load Direction | Radial Bearing |
The XL suffix on this designation is commonly associated with INA’s X-Life premium range, though this should be confirmed against the current manufacturer catalog for the specific production lot.
Application Suitability
| Industry | Typical Applications |
|---|---|
| Industrial Machinery | Hardened gear shafts in heavy reduction drives |
| Automotive & Heavy Vehicle Repair | Transmission countershafts, steering column intermediates |
| Material Handling | Conveyor pulley shafts, lift cylinder trunnions |
| Mining & Crushing | Vibratory screen eccentric journals |
| Agricultural Machinery | Combine harvester drive shafts, PTO splined journals |
When a Missing Suffix Crashes the Whole Line
Counterfeit and misidentified needle roller bearings look correct on paper until the inner raceway spalls out at week three. The INA NK110/40-XL needle roller bearing is designed for direct operation on hardened shafts, meaning shaft surface finish and hardness dictate life as much as the bearing itself. When buyers match only the base number and ignore suffix codes or shaft hardness requirements, the needles brinell into soft raceways under sustained radial loads, vibration spikes without warning, and the downstream equipment trips offline [NEED_CITE: needle roller bearing failure modes per ISO 15243].
Always verify shaft hardness at HRC 58-62 before running needle rollers without an inner ring.
The textile mill case in Vietnam stays with me: an NK110/30 was swapped for a drawn-cup alternative on a non-hardened spinning shaft. The needles chewed through the soft raceway within three weeks. Vibration monitors spiked, the spinning line halted, and the root-cause investigation cost far more than the bearing itself. Guessing on cross-reference is the most expensive shortcut in maintenance procurement.
How This Bearing Handles Real Shaft Load Profiles
The INA NK110/40-XL needle roller bearing fits applications where radial load is high, cross-section is tight, and shaft speed is moderate. Its needle roller geometry delivers a large contact area across the 40mm width, distributing load over a broader zone than conventional cylindrical rollers in the same envelope. The open design means external sealing is your responsibility — ideal when the housing already has labyrinth seals or when frequent relubrication access is part of the maintenance plan. When we supply cross-reference alternatives from other brands, we match clearance, cage type, and precision class together, not just the base designation. A dimensionally identical substitute with the wrong cage material will fail differently but just as surely.
What the Operating Environment Demands
Radial loads on needle roller bearings tend to be steady or slowly varying, but in vibrating screen and crusher applications, shock pulses travel up the shaft and demand cage integrity under repeated impact. Shaft temperature determines whether standard CN clearance suffices or whether thermal expansion at the interface calls for a C3 shift — installing the wrong clearance in a high-temperature housing creates interference where the engineer expected a sliding fit [NEED_CITE: thermal expansion effects on bearing internal clearance]. Lubrication access matters too: the open type here means fresh grease reaches the needle ends directly, but it also means contaminants have a clear path in unless the housing seal design is adequate. For dusty or wet environments, confirm the external seal specification before installation rather than discovering contamination ingress at the first oil analysis.
Reading Between the Rows of the Datasheet
The "without inner ring, without outer ring" construction is not a compromise — it is the load-density solution. Removing both rings maximizes the number of needles in the 110mm bore envelope, which is why needle roller bearings carry radial loads that would crush a ball bearing of equivalent section. The shaft itself becomes the inner raceway, so surface roughness, hardness, and geometric accuracy must meet the same standards as a manufactured ring. The X-Life designation within INA’s product architecture signals optimized internal geometry and manufacturing consistency aimed at extending fatigue life under comparable loading conditions. The 130mm outside diameter and 40mm width give this bearing a cross-section that fits where larger roller types simply cannot, making it the default choice when housing bore and shaft diameter are already fixed by legacy equipment design [NEED_CITE: INA X-Life design philosophy for needle roller bearings].
The Hidden Price Tag of Wrong Sourcing
Correct selection paired with genuine product from an authorized channel delivers predictable L10 life and planned maintenance intervals. Wrong clearance, counterfeit rollers with inadequate hardness, or a cage made from unspecified polymer delivers unplanned downtime, collateral shaft damage, and voided equipment warranties. Under ISO 281, calculated bearing life assumes material quality and manufacturing standards that counterfeit products do not meet, so the fatigue life formula simply does not apply to unverified stock [NEED_CITE: ISO 281 bearing life calculation assumptions on material quality]. The cost of a replacement bearing is negligible next to the cost of a production line standing idle while the root cause is investigated.
What We Bring to the Table on Every Shipment
Our sourcing runs through authorized distributor channels with documentation that traces back to the manufacturer’s production facilities, not through secondary traders with unverifiable stock history. We cross-reference against INA’s full suffix matrix so that clearance, cage, and precision align with the original equipment intent — we do not ship a base-number match and hope for the best. Every batch carries Certificate of Conformity paperwork, and QR code verification through Schaeffler’s official apps is available for authenticity confirmation on site. For import documentation, we provide country-of-origin paperwork and HS code guidance so customs clearance does not become a second procurement problem. When an application involves unusual shaft conditions or non-standard load profiles, our technical review covers selection guidance before the quote, not after the failure.
Documentation & Authenticity
- Certificate of Conformity tied to specific production batch with Schaeffler authorized channel traceability
- QR code verification pathway through INA official apps for on-site authenticity confirmation at receiving
- Third-party dimensional inspection report covering Fw, D, and B tolerances before dispatch
- Country-of-origin documentation and HS code support for import compliance across regional markets
- Material certificate confirming bearing steel specification for the needle rollers and outer shell
Storage, Handling & Mounting
- Retain original sealed packaging until the moment of installation to protect the anti-corrosion coating on the open needle assembly
- Confirm shaft hardness reaches HRC 58-62 before pressing the INA NK110/40-XL needle roller bearing onto the journal — softer shafts will brinell within weeks
- Use induction heating for any interference-fit outer ring installation; cold pressing risks cage deformation across the 40mm width
- Apply fresh grease through the open ends immediately after mounting, as no factory fill is retained in open-type needle bearings
- Inspect shaft surface roughness and roundness before assembly; needle rollers replicate every shaft imperfection into the load zone
Request a Technical Review
Share your operating parameters — radial load, shaft speed, housing temperature, and existing seal arrangement — so we can verify whether the INA NK110/40-XL is the correct specification or whether a sealed variant or different clearance class better suits the duty cycle. If you are replacing an OEM-specified bearing, send us the equipment nameplate or original part number so we can confirm cross-reference accuracy before quoting. We can also confirm current batch availability, lead time, and documentation package before you commit to a purchase order.
Frequently Asked Questions
Q: How do I confirm the authenticity of an INA needle roller bearing after delivery?
A: Schaeffler provides official mobile apps that scan the QR code on the product packaging and return batch verification data. We supply the packaging intact and the QR code should read as valid with matching lot information against the accompanying Certificate of Conformity.
Q: What does the X-Life designation mean for INA needle roller bearings?
A: X-Life indicates an optimized internal geometry and manufacturing consistency standard within INA’s product architecture, targeting extended fatigue life compared to earlier series under the same operating conditions. The specific production details should be confirmed against the current manufacturer catalog for your bearing lot.
Q: Can I substitute an NK110/30 in place of the NK110/40?
A: The bore diameter and outside diameter match, but the width difference — 30mm versus 40mm — changes the load-carrying contact area and the axial positioning within the housing. A narrower bearing carries less dynamic load rating and may allow axial shaft play that the original design did not account for. Always confirm with the equipment OEM or an engineering review before substituting.
Q: When should a needle roller bearing use an inner ring instead of running directly on the shaft?
A: If the shaft cannot be hardened and ground to the required surface finish, a separate inner ring provides the raceway surface. Running needle rollers directly on an unhardened or poorly finished shaft causes rapid brinelling and premature cage failure.
Q: What documentation do you provide for customs and import clearance?
A: We supply country-of-origin documentation, HS code guidance, Certificate of Conformity, and batch traceability paperwork as standard. Additional documents for specific import requirements can be arranged during the quotation stage.
Secure Your Next Maintenance Window with Verified Stock
Send us your application parameters or OEM part number today, and we will return a technical review with confirmed availability and full documentation scope.
