Description
Traceable Batch Sourcing — Every SKF NN3016 KTN/UPW33 unit we ship carries supplier Certificate of Conformity with full lot traceability back to authorized distributor channels.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | SKF NN3016 KTN/UPW33 |
| Bearing Type | Double Row Cylindrical Roller Bearing |
| Bore Diameter (d) | 80 mm |
| Outside Diameter (D) | 125 mm |
| Width (B) | 34 mm |
| Bore Type | Tapered (1:12) |
| Number of Rows | Double Row |
| Seal or Shield Type | Open |
| Cage Material | Polyamide 6,6 (Glass Fiber Reinforced) |
| Weight | 0.100 kg |
| Origin | China |
Note: The /UPW33 suffix could not be fully decoded from available SKF documentation and requires confirmation against the manufacturer catalog before final specification lock-in.
Application Suitability
| Industry | Typical Applications |
|---|---|
| Precision Machine Tools | CNC vertical machining center spindles, grinding headstocks |
| Industrial Gearboxes | High-speed reduction stages with rigid shaft support |
| Steel & Metallurgy | Rolling mill work roll neck positions requiring high radial stiffness |
| General Industrial MRO | Replacement bearings for OEM spindle assemblies |
When a Polyamide Cage Meets a Precision Spindle at 12,000 RPM
Cage material is not a cost-saving afterthought — it defines whether your spindle survives thermal equilibrium.
A few years back I visited a CNC shop where someone had swapped a brass-caged cylindrical roller bearing into a high-speed spindle to "save money." Within weeks, the heavier cage generated enough centrifugal force to distort roller guidance at operating speed. Vibration alarms tripped, surface finish degraded, and the shop scrapped an entire batch of aerospace titanium parts. The SKF NN3016 KTN/UPW33 double row cylindrical roller bearing avoids this trap entirely — the TN9 polyamide cage keeps mass low where it matters most [NEED_CITE: cage mass effect on high-speed cylindrical roller bearing dynamics]. Counterfeit bearings entering through unverified middlemen often cut corners here, substituting unreinforced nylon that softens above 80°C. A soft inner ring paired with a degrading cage is a failure waiting for the next production shift.
Matching Radial Rigidity to Spindle Load Profiles
Precision spindles demand bearings that resist radial deflection under cutting forces while accommodating thermal shaft growth. The SKF NN3016 KTN/UPW33 double row cylindrical roller bearing delivers this through its double-row roller complement, which distributes radial loads across two parallel contact lines rather than one. In practice, this means the spindle nose holds position during interrupted cuts — the kind that make single-row designs chatter. We recently helped a gear manufacturer substitute away from a competitor’s single-row unit; the cross-reference alignment covered bore taper, cage type, and dimensional envelope so the changeover required zero housing modification.
Thermal Growth, Lubrication Envelope, and the Open-Type Advantage
Operating temperature in a spindle housing can swing significantly from cold start to thermal steady state. The open-type design of this bearing means lubrication is managed externally — oil-air or oil-jet systems feed clean lubricant directly to the roller-raceway contacts. This matters because sealed alternatives trap degraded grease that cannot be purged during operation [NEED_CITE: open vs sealed bearing lubrication strategies for machine tool spindles]. The tapered bore allows axial drive-up on a matching tapered shaft seat, giving maintenance crews direct control over internal clearance reduction during mounting. Get the drive-up distance right, and the bearing reaches its designed radial stiffness. Get it wrong, and you either starve the rollers of preload or crush them against the outer raceway.
What the K, TN9, and Double-Row Design Actually Do
The K suffix specifies a 1:12 tapered bore — this is not a minor variant but the standard mounting method for precision spindle positions where interference fit must be controlled by axial displacement rather than press force. The TN9 cage is injection-molded, glass-fiber-reinforced polyamide 6,6, chosen specifically for its low density and favorable sliding properties against roller ends. Compared to machined brass cages, TN9 cages run cooler at elevated speeds because they generate less windage and sliding friction [NEED_CITE: polyamide vs brass cage friction characteristics in cylindrical roller bearings]. The double-row NN configuration places rollers in a back-to-back arrangement within a single outer ring, providing moment stiffness that single-row NU or NJ types simply cannot match in the same axial space.
What a Wrong Suffix Costs at 3 AM
Selecting the right base number but ignoring the suffix package is how maintenance teams inherit catastrophic spindle seizures. A standard CN clearance bearing installed where the spindle manufacturer specified reduced clearance will develop excessive internal play once the housing reaches thermal equilibrium — leading to roller skidding, cage pocket wear, and eventually surface spalling classified under ISO 15243 fatigue modes. Conversely, a counterfeit unit with cloned markings may pass visual inspection but fail dimensional verification on bore taper angle or roller profile. The downtime cost is never just the bearing price [NEED_CITE: unplanned downtime cost multiplier in precision machining operations]. It is the scrapped workpiece, the missed shipment, and the customer audit that follows.
How We Reduce Procurement Risk on This Bearing
Every SKF NN3016 KTN/UPW33 double row cylindrical roller bearing we source moves through authorized distributor channels with documentation you can independently verify. We do not ask you to trust our word — we provide the Certificate of Conformity, batch lot numbers traceable to the production run, and guidance on using SKF’s official app to scan QR codes on packaging. When a buyer needs to cross-reference from FAG or NSK, our interchange comparison covers bore taper ratio, cage material, and precision class simultaneously — not just the base designation. For import compliance, we prepare country-of-origin documentation and HS code references so customs clearance does not become a second bottleneck.
Documentation & Authenticity
- Supplier Certificate of Conformity (COC) referencing specific batch and lot numbers for full upstream traceability
- QR code verification pathway via SKF official mobile apps — scan the packaging before breaking the seal
- Third-party dimensional inspection reports available on request, covering bore taper, OD, and width tolerances
- Country-of-origin certificate and HS code documentation prepared for import customs clearance
- Material test certificates confirming bearing steel composition and heat treatment compliance
Storage, Handling & Mounting
- Retain original sealed packaging until the moment of mounting; the open-type design means any shop-floor contamination on the roller surfaces will score the raceway within the first operating hour
- Store horizontally in a climate-controlled environment — polyamide TN9 cages absorb moisture over time, which can alter dimensional stability if the bearing sits unmounted for extended periods in high humidity
- During tapered bore mounting, measure axial drive-up distance against the spindle manufacturer’s specification to achieve the target residual internal clearance; under-driving leaves excess play while over-driving risks roller edge loading
- Use induction heating for the inner ring rather than open flame — localized overheating above 120°C can anneal the bearing steel and compromise the hardened raceway surface
- Apply clean, filtered lubricant immediately after mounting since the open design provides no integral contamination barrier
Requesting a Quotation on This Bearing
Share your spindle operating parameters — speed range, radial load estimate, and thermal environment — so we can confirm clearance class suitability before quoting. If you are replacing an existing bearing, provide the OEM equipment number or the full part number from the nameplate; this lets us run a cross-reference check that covers taper ratio, cage material, and precision suffix alignment. We will respond with current batch availability, lead time, and the complete documentation package you can expect with shipment.
Frequently Asked Questions
Q: How can I verify the authenticity of an SKF NN3016 KTN/UPW33 bearing after receiving it?
A: SKF provides QR codes on product packaging that link to their official verification app. Scan the code before opening the seal — the app confirms whether the packaging serial number matches SKF’s production records. We also supply a Certificate of Conformity with batch and lot traceability that you can cross-reference independently with the manufacturer.
Q: What does the /UPW33 suffix indicate on this bearing?
A: The /UPW33 suffix could not be fully resolved through standard SKF catalog references at this time. It likely relates to a specific internal design or lubrication variant, but we recommend confirming its exact meaning against the manufacturer’s current technical documentation before finalizing your specification.
Q: How do I select the correct internal clearance for a precision spindle application?
A: Spindle manufacturers typically specify reduced or non-standard clearance classes because the bearing must reach a target preload after thermal expansion stabilizes. Standard CN clearance is rarely correct for this application. Share your operating temperature range and shaft interference fit dimensions, and we can help verify the clearance class the OEM originally specified.
Q: What are the trade-offs between TN9 polyamide cages and machined brass cages in this bearing size?
A: TN9 cages are significantly lighter, reducing centrifugal loading on roller guidance at high speeds and generating less friction heat. Machined brass cages tolerate higher operating temperatures and are more resistant to certain aggressive lubricants. For most precision spindle applications within normal temperature ranges, the TN9 cage is the performance-preferred option.
Q: Can I interchange this SKF bearing with an NSK or FAG equivalent?
A: Cross-brand substitution is possible but requires aligning more than just the base number. Bore taper ratio, cage material, internal clearance, and precision class must all match. We maintain interchange comparison data across SKF, NSK, FAG, NTN, TIMKEN, and KOYO — share your current part number and we will confirm whether a direct equivalent exists.
Confirm Your SKF NN3016 KTN/UPW33 Specification and Batch Availability
Send us your application parameters or OEM part number, and we will return a matched quotation with full documentation and lead time within one business day.
