INA NA6911-ZW-XL Needle Roller Bearing 55x80x45mm Genuine

Traceable Supply Chain — Every INA NA6911-ZW-XL needle roller bearing we ship carries full batch documentation linking it back to the manufacturer's authorized distribution network, so you can verify origin before it ever reaches your maintenance floor.

Technical Specifications

Suffixes ZW and XL require verification against the current INA catalog for precise technical meaning; XL typically denotes the X-life product line with optimized internal geometry.

Application Suitability

What Happens When a Needle Roller Cage Fails at 90°C

A three-week service life on a conveyor reducer taught me that suffix-level verification is not optional.

I spent years tearing down gearboxes on cement plant floors across West Africa. One failure in Nigeria still stands out: a double-row needle roller bearing in a conveyor reducer was specified with a machined brass cage and C3 clearance, but the part that arrived had a stamped steel cage and standard clearance. Under continuous radial load and sustained high temperatures, the cage cracked, rollers jammed, and the entire reducer locked up. The unplanned shutdown cost far more than the bearing ever would have [NEED_CITE: rolling bearing failure mode classification per ISO 15243]. When you source an INA NA6911-ZW-XL needle roller bearing, the suffix details — cage type, clearance, and X-life designation — must all align with what the application demands.

Matching the NA6911-ZW-XL to Your Operating Envelope

The INA NA6911-ZW-XL needle roller bearing is built around a 55 mm bore with an 80 mm outside diameter, giving it a compact radial cross-section that fits tight housing envelopes common in gearbox and reducer designs. The included inner ring means you do not need to harden and grind the shaft to serve as a raceway — a practical advantage when retrofitting older equipment where shaft rework is impractical. We cross-check every substitution request against load, speed, and thermal parameters so the replacement actually survives in the field, not just on paper.

Load, Speed, and Thermal Boundaries

This bearing handles heavy radial loads — the 102,000 N dynamic rating reflects the high roller count typical of needle roller geometry. However, needle roller bearings cannot carry axial load, so any thrust component must be handled by a separate thrust bearing in the housing. At higher operating temperatures, thermal expansion of the shaft and housing can close internal clearance rapidly; if the original specification called for C3 or greater clearance, substituting standard CN clearance will cause binding and cage failure [NEED_CITE: thermal expansion effects on bearing internal clearance]. Lubrication choice matters equally: grease lubrication supports speeds up to 7,300 rpm on this model, while oil circulation extends that envelope further but demands proper sealing at the housing level.

Cage Design and X-Life Internal Geometry

The cage in this bearing separates and guides the rollers, preventing roller-to-roller contact that would generate excess heat at higher speeds. X-life designated bearings from INA feature optimized raceway surface finish and roller profile, which distributes contact stress more evenly and extends fatigue life under the ISO 281 framework. The machined outer ring includes a lubrication groove and hole, allowing relubrication through the housing without disassembly — critical for equipment running in dusty environments where grease purge intervals must be maintained regularly.

When the Wrong Part Reaches the Field

Procurement teams sometimes match the base designation but overlook cage material, clearance class, or X-life status. A standard-grade lookalike might fit the housing and turn freely on the bench, but under sustained load it will not deliver the fatigue life that the X-life internal geometry provides. Counterfeit needle roller bearings with soft inner rings and cloned markings pass casual visual inspection yet fail within weeks [NEED_CITE: counterfeit bearing detection methods in industrial supply chains]. The cost is never just the bearing — it is the crane rental, the lost production shift, and the warranty claim your customer files against you.

How We Reduce That Risk at Every Stage

Every INA NA6911-ZW-XL needle roller bearing we supply comes through authorized distributor channels with traceable batch documentation. We run cross-reference checks that align bore diameter, outside diameter, width, cage type, and clearance — not just the base number. When a maintenance engineer sends us an OEM equipment number, we trace it back to the original specification and flag any suffix mismatches before quoting. Our team provides application-based selection guidance so that unusual load spectra, elevated temperatures, or contaminated environments are addressed before the order ships, not after the first failure.

Documentation & Authenticity

• Supplier Certificate of Conformity tied to the specific batch and lot number of your NA6911-ZW-XL shipment
• QR code verification pathway through the official INA app for on-site authenticity confirmation before installation
• Country-of-origin documentation prepared for customs clearance and import compliance in your destination market
• Dimensional inspection report covering critical bore, OD, and width tolerances measured before dispatch
• Material certificate confirming bearing steel composition and heat treatment condition for the inner ring and outer ring

Storage, Handling & Mounting

• Keep the NA6911-ZW-XL in its original sealed packaging until the moment of installation; early exposure to humid workshop air compromises the factory-applied corrosion inhibitor on the open bearing surfaces
• Store flat on a shelf in a temperature-stable environment below 30°C; avoid vertical stacking that could dent the thin-section outer ring of this 80 mm OD needle roller bearing
• Wear clean lint-free gloves when handling; fingerprint moisture on the exposed raceways of an open-type needle roller bearing initiates corrosion that accelerates once the bearing is under load
• The included inner ring must be mounted separately from the outer ring and roller assembly — press the inner ring onto the shaft first, then install the cage-and-roller set into the housing to avoid roller damage
• After installation, verify that the housing seals are intact and functional; this open-type bearing relies entirely on external sealing to keep contaminants out of the needle roller paths
• Confirm relubrication intervals based on your operating temperature and dust exposure, using the outer ring lubrication groove and hole for grease replenishment without disassembly

Request a Technical Quotation

Share your operating parameters — radial load, speed, ambient temperature, and sealing arrangement — so we can confirm the INA NA6911-ZW-XL needle roller bearing suits your application before issuing a formal quote. If you are replacing an existing part, send the OEM equipment number or the marking on the old bearing and we will cross-reference the full specification including cage and clearance details. Ask for the documentation package and country-of-origin confirmation at the inquiry stage so your import paperwork is ready before the shipment leaves.

Frequently Asked Questions

Q: How can I verify that the NA6911-ZW-XL I received is a genuine INA product? A: Each bearing carries a traceable batch code. Use the official INA app to scan the QR code on the packaging, which links back to the production batch and authorized distribution record. We also supply a Certificate of Conformity with every shipment that you can cross-check independently.

Q: What should I verify when cross-referencing this needle roller bearing to another brand? A: Beyond matching the 55 mm bore, 80 mm OD, and 45 mm width, you must confirm the cage type, clearance class, and whether the substitute includes an inner ring. A base-number match alone will not prevent field failures if cage material or internal geometry differs from the original specification.

Q: What is the difference between a caged needle roller bearing and a full complement design? A: Caged designs separate the rollers, allowing higher speed capability and lower friction. Full complement bearings pack more rollers into the same envelope for maximum static load capacity but run hotter at speed. For gearbox and reducer applications where speeds are moderate and loads are continuous, the caged configuration generally provides better service life.

Q: What shaft and housing conditions are required if I use a needle roller bearing without an inner ring? A: The shaft surface must be hardened to at least HRC 58-62 and ground to a fine surface finish to function as the inner raceway. The NA6911-ZW-XL includes an inner ring, which eliminates that requirement — but if you ever switch to a cage-and-roller-only variant, shaft preparation becomes critical.

Q: What do the ZW and XL suffixes indicate on this bearing? A: XL typically denotes INA's X-life product line, which features optimized raceway geometry for extended fatigue life. The ZW suffix requires confirmation against the current manufacturer catalog for its precise technical meaning on this specific designation [NEED_CITE: INA needle roller bearing suffix nomenclature].

Confirm Your Specification and Request Documentation Send us your application parameters or OEM part number and we will return a matched quote with full traceability paperwork within one business day. Contact our technical team through your existing account channel or submit an inquiry with your equipment details to begin.