INA NKI35/30-XL Needle Roller Bearing 35x50x30mm

Authorized Channel Sourcing — Every INA NKI35/30-XL needle roller bearing we ship arrives with batch-level traceability tied to Schaeffler's authorized distributor network, ensuring procurement engineers can verify origin before the crate leaves the dock.

Technical Specifications

The XL suffix on this designation is noted in Schaeffler's X-life series literature but remains unverified for this specific configuration; confirm exact series classification against the current manufacturer catalog before finalizing specifications.

Application Suitability

What Happens When Needle Roller Substitutes Fail on Compact Gearbox Shafts

A dimensional match on paper does not survive cyclic loading in the field.

Early in my career, I sourced a needle roller bearing for a small reducer by matching bore, OD, and width alone. The replacement looked identical in every catalog table. Three months later, the cage disintegrated under repeated load cycles because the substitute rollers lacked the surface treatment and raceway finish the original specified. The warranty claims nearly killed that contract. [NEED_CITE: rolling bearing failure mode classification per ISO 15243] When procurement teams cross-reference the INA NKI35/30-XL needle roller bearing, the base dimensions are only the starting point. Overlooking cage material, roller profile, and the X-life surface condition leads to premature cage fracture, metal contamination in the gearbox oil, and unplanned line shutdowns that dwarf the price difference of the original part.

Matching the Radial Envelope Constraint in Small Gearboxes

The INA NKI35/30-XL needle roller bearing occupies a 35×50×30 mm envelope, which is typical for auxiliary shafts in compact industrial reducers where every millimeter of cross-section is contested between bearing capacity and housing wall thickness. Needle rollers carry high radial loads relative to their section height, making them the default choice when designers cannot afford the radial depth of a ball or spherical roller bearing. Open-type construction allows direct oil-bath or splash lubrication from the gearbox sump, eliminating the need for separate grease channels that add machining cost to small housings. When we cross-reference this designation against equivalent models from other brands, we align bore diameter, outside diameter, width, cage type, and surface treatment together — never just the numeric base.

Load Spectra and Thermal Conditions Inside Gearbox Housings

Gearbox internal shafts see predominantly radial loading with moderate shock from gear mesh impacts and frequent directional reversals during start-stop cycles. Operating temperatures typically climb above ambient once the oil sump reaches equilibrium, meaning thermal expansion of the shaft and housing must be accounted for during fit selection. An open-type bearing like this one depends on the gearbox's own filtration and oil-change intervals to keep contaminants out of the rolling contact zone. [NEED_CITE: needle roller bearing lubrication interval guidelines for enclosed gear drives] The 35 mm bore means shaft fits are generally on the tighter side of the tolerance band, and pressing an inner ring onto a shaft without controlled induction heating can score the raceway before the gearbox ever turns over.

Reading the Core Specifications That Matter

The inner ring included with the INA NKI35/30-XL needle roller bearing allows installation on hardened-and-ground shafts where the shaft surface itself is not prepared to serve as a roller raceway — a common requirement in repair scenarios where replacing the entire shaft is uneconomical. Bearing steel construction provides the standard hardness and fatigue resistance needed for the Hertzian contact stress that needle rollers generate along their line contact with the raceway. Open-type design trades contamination protection for zero seal friction, which matters in small gearboxes where seal drag can represent a measurable share of total power loss. The single-row arrangement keeps axial guidance simple, but it also means any axial load must be handled by a separate locating bearing elsewhere on the shaft.

The Hidden Price of an Incorrect Needle Roller Selection

Installing a needle roller bearing that matches bore and OD but uses a standard cage and untreated rollers in an application that demands X-life surface conditioning will produce spalling on the inner ring raceway within a fraction of the calculated L10 life. [NEED_CITE: ISO 281 basic rating life framework for rolling bearings] Metal particles from early spalling circulate through the gearbox oil and attack meshing gear flanks, turning a bearing replacement into a full gearbox rebuild. Counterfeit needle rollers with soft cores and cloned outer markings are entering industrial supply chains through unverified intermediaries, and they pass casual visual inspection because the packaging and laser etching are convincing. Downtime on a production gearbox is measured in lost output per hour, not in the unit cost of the bearing sitting in the storeroom.

How We Source and Verify This Bearing for Industrial Buyers

We procure the INA NKI35/30-XL needle roller bearing through Schaeffler's authorized distributor channels, which means every batch carries traceable documentation linking back to the production lot. Our cross-reference database covers all six major brands we stock — SKF, NSK, FAG, TIMKEN, NTN, and KOYO — and we match on cage design, surface treatment, and clearance rather than just the base number. When a procurement engineer sends us an OEM equipment number instead of a bare bearing designation, we work backward through the equipment bill of materials to confirm the exact variant required. Country-of-origin documentation is prepared for each shipment so that import compliance teams in the Middle East, Africa, Latin America, and Central Asia can clear customs without delays. Every order ships with a Certificate of Conformity and the dimensional inspection data that maintenance managers need to log in their asset management systems.

Documentation & Authenticity

• Supplier Certificate of Conformity tied to the specific batch and lot number of each INA NKI35/30-XL needle roller bearing shipped, enabling full traceability from receipt to installation.
• Schaeffler official app QR code verification pathway printed on packaging, allowing receiving inspectors to confirm authenticity on the dock before the bearing enters inventory.
• Third-party dimensional inspection report confirming bore, OD, and width tolerances against published catalog values before dispatch.
• Country-of-origin documentation package prepared to satisfy import compliance requirements in the buyer's destination market.
• Material certificate confirming bearing steel grade and heat-treatment specification for the inner ring and outer shell.

Storage, Handling & Mounting

• Keep each INA NKI35/30-XL needle roller bearing in its original sealed export packaging until the moment of installation; the 35 mm bore inner ring raceway is exposed on the open-type design and will collect dust or moisture if stored unpackaged in a workshop environment.
• Maintain storage area humidity below 60 percent to protect the bearing steel surfaces and the factory-applied corrosion preventive, especially in tropical or coastal warehouse locations common among our Middle East and Southeast Asia customers.
• Use clean, lint-free gloves when handling the single-row needle roller cage assembly; finger acids on bare skin can initiate micro-corrosion pits on the rollers that propagate into spalling under cyclic load.
• For shaft mounting, apply controlled induction heating to the inner ring rather than mechanical pressing alone — the 35 mm bore and 30 mm width create enough press-fit interference that brute-force installation risks brinelling the needle rollers against the outer raceway.
• After installation in an open-type gearbox application, confirm that the housing lubrication system delivers adequate oil flow to the bearing zone; the INA NKI35/30-XL needle roller bearing relies entirely on the gearbox sump or splash system since it carries no integral seals or pre-packed grease.

Request a Quotation or Technical Review

Share your application parameters — load spectrum, operating speed, housing temperature, and lubrication method — so our engineering desk can verify the INA NKI35/30-XL needle roller bearing against your specific duty cycle and confirm the XL variant is the correct match. If you are replacing a bearing identified only by an OEM equipment serial number, send that number and we will cross-reference through the equipment manufacturer's parts list to eliminate substitution errors. Request the full documentation package including origin confirmation before committing to a bulk order. Contact us with your target delivery window so we can confirm batch availability and lead time from the authorized distributor network.

Frequently Asked Questions

Q: How do I verify the authenticity of an INA needle roller bearing through the official app? A: Scan the QR code printed on the product packaging using Schaeffler's official mobile application. The app returns the production batch, manufacturing facility, and series classification for that specific bearing. We supply each INA NKI35/30-XL needle roller bearing with intact, untampered packaging so the QR path remains available at your receiving inspection.

Q: What should I check when cross-referencing this needle roller bearing to another brand? A: Match bore diameter (35 mm), outside diameter (50 mm), and width (30 mm) first, then confirm cage material, roller surface treatment, and whether the substitute includes an inner ring. A base-number-only match that ignores these factors is the most common cause of premature cage failure in cross-referenced needle roller applications.

Q: Should I choose an open or sealed needle roller bearing for a gearbox application? A: Enclosed gearboxes with an oil-bath or splash lubrication system typically use open-type bearings like this designation because the gearbox oil provides both lubrication and cooling without the friction penalty of contact seals. Sealed variants are reserved for applications where external contamination cannot be controlled by the housing design.

Q: What are the re-lubrication requirements for this open-type needle roller bearing? A: Open-type needle roller bearings in enclosed gearboxes rely on the gearbox oil itself, so re-lubrication intervals align with the gearbox manufacturer's oil-change schedule rather than a separate bearing greasing cycle. Always confirm that the oil level and filtration rating meet the bearing manufacturer's recommendations for needle roller contact zones.

Q: What lead times and documentation should I expect for a bulk order? A: Lead time depends on current stock position within the authorized distributor network at the time of inquiry. Every bulk shipment includes the Certificate of Conformity, material certificate, dimensional inspection data, and country-of-origin documentation. Confirm your required delivery date and destination port when requesting a quotation so we can align logistics accordingly.

Get Your INA NKI35/30-XL Specification Package Send your application data or OEM equipment number to our engineering desk, and we will return a cross-verified specification sheet with full documentation preview. Contact: sales@bearing.com