1 Model Information & Technical Parameters

Model：NN 3010 KTN/W33VQ497

Dimensions

Bore d：50 mm

Outer diameter D：80 mm

Width B：30 mm

Bore type: 1:12 tapered bore

Outer ring feature: W33 annular oil groove with lubrication holes

Code Explanation

NN: Double row cylindrical roller bearing, inner ring double ribs, ribless outer ring, separable inner and outer rings

3010: Size series 30, size code 10, nominal bore 50 mm, medium cross-section balancing radial rigidity and limiting speed

K: 1:12 tapered bore. Inner ring expands radially under axial tension from lock nut for adjustable preload during assembly

TN: Solid polyamide roller-guided cage; continuous operating temperature ≤120°C

W33: Annular oil groove and through lubrication holes on outer ring, compatible with external centralized oil supply

VQ497: Vibration optimized grade, precisely sorted rollers with refined surface finish to reduce running vibration and noise

Load Characteristics

Mainly withstand bidirectional radial loads. Axial load capacity is limited. Cannot bear continuous axial cutting force independently, must be combined with precision angular contact ball bearings. Separable construction with double-row steel rollers and TN polyamide cage. W33 oil path facilitates centralized lubrication, and VQ497 optimizes roller matching for smoother rotation.

Limiting speed: Stable performance under medium and high speed; circulating oil or oil-air lubrication recommended.

Pre-grease: No pre-filled lubricant, apply lubricant according to lubrication system specification during installation.

Logistics & Industry Codes

Net weight：0.21 kg

Indicative carbon footprint：0.23 kg CO₂e

eClass code：23-05-09-01

UNSPSC code：31171505

Suffix Explanation

NN: Double row cylindrical roller bearing, ribless outer ring, separable rings. Higher radial rigidity and load rating than single-row cylindrical roller bearings of equivalent size, widely used for spindle radial support.

3010: Medium cross-section Series 30 with balanced rigidity, general specification for various precision machine tool spindle units.

K: 1:12 tapered bore. Preload can be flexibly set via hydraulic or lock nut expansion, suitable for light-to-medium load finishing.

TN: Polyamide roller-guided cage with low friction and low temperature rise. TNHA high-temperature cage available for sustained high-temperature operation.

W33: Outer ring with oil groove and holes for external centralized lubrication, continuously delivering lubricant to rolling contact zone for long-term continuous operation.

VQ497: Vibration optimized specification with stricter control on roller grouping, surface roughness and profile, lowering rotational vibration and improving workpiece surface quality, ideal for grinding processes.

Important reminder: Cannot bear axial load independently. Match with precision angular contact ball bearings. Continuous temperature above 120°C is forbidden for TN cage. Ensure housing oil passages align with W33 holes without blockage. VQ497 bearings require high assembly cleanliness; contaminants amplify vibration and noise. Preload must be precisely controlled; excessive preload leads to higher temperature and worse vibration performance. Hammer assembly prohibited; use hydraulic nut for uniform pressing.

Alternative variants:

NN3010 KTN/W33 (outer ring oil groove, standard precision without vibration optimization)

NN3010 KTN/W33UP (W33 with UP ultra-precision grade)

NN3010 KTNHA/W33VQ497 (high-temperature cage, W33, VQ497 low vibration specification)

2 Structure & Operating Characteristics

NN 3010 KTN/W33VQ497 is a vibration-optimized double row cylindrical roller bearing with outer ring lubrication configuration. Double-row roller arrangement provides high radial rigidity. The 1:12 tapered bore allows flexible preload adjustment to balance low heat generation at high speed and rigidity during cutting. The W33 oil groove and holes are perfectly compatible with circulating centralized lubrication systems to remove friction heat continuously. VQ497 improves roller matching accuracy and reduces vibration excitation during rotation. Separable rings simplify spindle disassembly and maintenance.

Selection guide:

NN3010 KTN/W33VQ497 (taper bore TN cage, W33 lubrication, VQ497 low vibration for continuous precision grinding spindles)

NN3010 KTN/W33 (outer ring oil groove only, no vibration optimization for general cutting spindles)

NN3010 KTNHA/W33VQ497 (long-hour continuous production under elevated temperature)

NN3010 KTN/W33UP (prioritize rotational accuracy and radial runout)

Recommended matching bearings: 7010 / 7210 series precision angular contact ball bearings for full spindle load matching.

3 Core Performance Advantages

1. VQ497 vibration optimized standard with precisely selected rollers, lowering operational vibration, suppressing chatter marks and improving workpiece surface finish.

2. W33 annular oil groove and lubrication holes compatible with external centralized oil-air or circulating oil lubrication, enhanced heat dissipation for non-stop long-time production.

3. NN double-row roller layout delivers higher radial rigidity and load capacity than single-row cylindrical roller bearings with identical bore size, balancing rigidity and rotational smoothness.

4. 1:12 tapered bore enables flexible on-site preload adjustment to adapt to multiple finishing processes, better adjustability than fixed-preload straight bore solutions.

5. Lightweight TN polyamide roller-guided cage reduces friction loss and controls temperature rise under medium-high speed; separable inner and outer rings facilitate inspection and replacement.

4 Typical Application Fields

4.1 Continuous-operation precision grinding machine spindles

Internal & cylindrical grinders, surface grinders, centerless grinder high-precision spindles, grinding power units with circulating lubrication and strict vibration control

4.2 Long-running CNC machining spindles

Precision CNC lathes, medium-small high-speed machining centers, turn-mill composite finishing spindles equipped with centralized oil-air or circulating oil lubrication

4.3 High-end precision rotary mechanisms requiring low vibration, superior surface quality, external circulating lubrication and adjustable assembly preload

5 Assembly Specifications & Usage Guidelines

5.1 Assembly Environment & Operation Standards

VQ497 optimized bearings should be assembled in constant-temperature dust-free clean workshops. Completely remove chips, dust and oil from shafts, housings and spacers. Align housing oil passages with bearing W33 lubrication holes to avoid blockage. Apply preload evenly to tapered bore inner ring via hydraulic nut; hammering bearing faces is prohibited. Preload travel must be strictly monitored; excessive preload increases temperature and deteriorates vibration performance. After assembly, conduct gradual speed-up and no-load run-in test for temperature and vibration inspection. Shaft journal and housing bore tolerances shall meet precision bearing standards; observe the 120°C temperature limit for TN cages.

5.2 Selection Guidance

Continuous production, centralized circulating lubrication, strict spindle vibration control → NN3010 KTN/W33VQ497

Centralized lubrication, moderate vibration requirements, cost-sensitive → NN3010 KTN/W33

Non-stop long-hour machining, high ambient operating temperature → NN3010 KTNHA/W33VQ497

Highest rotational accuracy priority, focus on radial runout → NN3010 KTN/W33UP

For significant axial loads: Combine this bearing with precision 7010 / 7210 angular contact ball bearings.

5.3 Lubrication Maintenance Instruction

No lubricant pre-filled at factory. Centralized oil-air lubrication or low-pressure circulating oil lubrication is recommended to maximize the benefits of W33 oil path. Long-term simple grease lubrication is not preferred. Maintain steady-state temperature rise below 25K. Avoid continuous temperature exceeding 120°C for TN polyamide cages. Regularly monitor oil supply pressure, oil passage status, spindle vibration and workpiece quality. Investigate lubricant contamination, preload decay or particle intrusion if vibration rises continuously.

5.4 Environmental Application Notes

No integrated seals. Install oil seals or labyrinth seals on spindle assembly to block coolant and grinding dust. VQ497 optimized rolling contact surfaces are sensitive to hard contaminants; tiny particles easily trigger higher vibration and surface damage. Long-term shock loads and sustained axial loads are forbidden. Minimize frequent sharp thermal cycling to maintain bearing dimensional stability. Periodically inspect W33 lubrication holes to prevent blockage leading to local overheating.

6 Fault Identification

Common failure modes: Persistent rising spindle vibration, periodic grinding patterns on workpieces, abnormal temperature increase, periodic abnormal noise, local overheating caused by blocked oil holes, indentations or fatigue spalling on raceways, roller end face wear. Stop equipment immediately when vibration or accuracy cannot be recovered or continuous abnormal noise occurs. Bearings with permanent damage on raceways or rollers cannot be repaired and require complete replacement.