1 Model Information & Technical Parameters

Model：NN 3010 KTN/VQ497

Dimensions

Bore d：50 mm

Outer diameter D：80 mm

Width B：30 mm

Bore type: 1:12 tapered bore

Code Explanation

NN: Double row cylindrical roller bearing, inner ring double ribs, outer ring ribless, 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, standard series for heavy-duty precision spindles

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

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

VQ497: Bearing steel with special thermal stabilization treatment to reduce dimensional variation under sustained high temperature and mitigate ring creep for spindles with long continuous operation and elevated temperature

Load Characteristics

Permitted load: Mainly bidirectional radial loads; axial load capacity is extremely low. Cannot support axial force independently and must be combined with angular contact ball bearings for axial load bearing

Structure: Separable design with double ribs on inner ring, all-steel double-row rollers, TN polyamide cage, VQ497 thermally stabilized steel inner & outer rings

Limiting speed: Double-row structure provides high rigidity and greatly improved load capacity versus single-row bearings with identical bore size, suitable for medium-high speed heavy cutting; oil-air lubrication delivers optimal performance

Pre-grease: No pre-filled lubricant, lubricant added upon assembly

Logistics & Industry Codes

Net weight：0.21 kg

Indicative carbon footprint：0.24 kg CO₂e

eClass code：23-05-09-01

UNSPSC code：31171505

Suffix Explanation

NN: Double row cylindrical roller bearing without outer ribs, separable construction. Double-row roller arrangement delivers superior radial rigidity and load rating compared with N-type single row bearings, widely adopted as radial support for heavy-duty machine tool spindles.

3010: Medium cross-section Series 30 with outstanding rigidity, commonly used in machining centers, CNC lathes and grinder precision spindles.

K: 1:12 tapered bore. Inner ring expands by nut tension, allowing flexible preload setting to adapt to light and heavy cutting conditions.

TN: Polyamide roller-guided cage with low friction. TNHA reinforced cage version available for continuous high-temperature service.

VQ497: Thermally stabilized bearing steel optimizing metallurgical stability to minimize dimensional drift caused by long-term operating heat and stabilize preload status.

Important reminder: Cannot bear axial load alone. Spindle system must be fitted with matched precision angular contact ball bearings to withstand axial cutting forces. Continuous operating temperature over 120°C is prohibited for TN polyamide cage. Preload must be precisely controlled; excessive preload triggers sharp temperature rise and neutralizes VQ497 material stability advantages. Hammer impact assembly forbidden; uniform axial pressing via hydraulic nut is recommended. Straight bore alternative: NN3010 TN/VQ497. Reinforced cage variant: NN3010 KTNHA/VQ497. Standard steel variant without VQ497: NN3010 KTN.

2 Structure & Operating Characteristics

NN 3010 KTN/VQ497 precision double row cylindrical roller bearing adopts double-row roller layout to achieve ultra-high radial rigidity and load capacity. VQ497 thermally stabilized steel is optimized for long continuous machine processing to alleviate ring creep induced by sustained heat. The 1:12 tapered bore enables flexible preload adjustment during commissioning, balancing rigidity for low-speed heavy cutting and temperature control for medium-high speed finishing. Separable ring design simplifies spindle maintenance and bearing replacement.

Selection reference:

NN3010 KTN/VQ497 (taper bore, standard TN polyamide cage, VQ497 thermally stabilized steel, heavy-duty precision spindles with continuous operation)

NN3010 TN/VQ497 (straight bore VQ497 steel, modular spindles with fixed spacer preload)

NN3010 KTNHA/VQ497 (taper bore TNHA high-temperature resistant cage, 24-hour non-stop mass production equipment)

NN3010 KTN (taper bore standard steel, intermittent operation with low temperature rise)

Matched bearings: 7010 / 7210 series precision angular contact ball bearings for axial load support.

3 Core Performance Advantages

1. NN double-row roller arrangement provides much higher radial rigidity and load capacity than single row cylindrical roller bearings of the same bore size, suitable for heavy cutting with large radial cutting forces.

2. VQ497 special thermally stabilized bearing steel improves dimensional stability at elevated temperature, resisting ring creep during prolonged continuous operation and maintaining consistent preload.

3. 1:12 tapered bore allows flexible on-site preload adjustment to cover heavy cutting and finishing processes, offering higher tuning flexibility than fixed-preload straight bore solutions.

4. TN polyamide roller-guided cage is lightweight with low friction loss, effectively restraining frictional temperature rise under medium-high speed operation.

5. Separable inner and outer rings facilitate disassembly and maintenance. Series 30 is a mature standard specification widely used in spindles of domestic CNC lathes, grinders and machining centers.

4 Typical Application Fields

4.1 Heavy-Duty Precision Main Machine Tool Spindles

CNC lathe spindles, internal & cylindrical grinder spindles, medium-small machining center spindles, turn-mill composite machine spindles

4.2 Continuous mass-production rotary units with elevated spindle temperature requiring stable long-term preload

Electric spindles for CNC lathes on automated production lines, continuous grinding power heads, heavy-duty precision rotary fixtures

4.3 Precision rotary machinery subjected to heavy radial loads demanding high rigidity, equipped with adjustable assembly preload and combined with angular contact ball bearings

5 Assembly Specifications & Usage Guidelines

5.1 Assembly Environment & Operation Standards

Precision spindle bearings shall be assembled in clean, constant-temperature dust-free workshops. All mating components must be thoroughly cleaned of chips, oil and hard contaminants. Preload is applied uniformly to tapered bore inner ring by hydraulic nut; striking bearing faces is forbidden. Preload travel must be strictly controlled, as excessive preload leads to persistent temperature rise and accelerated cage aging. After assembly, perform long-duration no-load temperature run-in starting from low speed with gradual speed ramp-up. Shaft journal and housing bore geometric tolerances shall comply with precision spindle bearing standards. Observe temperature limit for TN cage.

5.2 Selection Guidance

Long continuous mass production, heavy load, adjustable preload, high thermal dimensional stability required → NN3010 KTN/VQ497

Modular mass assembly with fixed spacer preload without on-site tuning → NN3010 TN/VQ497

24-hour non-stop operation under elevated ambient temperature, high-temperature reinforced cage needed → NN3010 KTNHA/VQ497

Intermittent processing with low temperature rise, budget limited without VQ497 steel → NN3010 KTN

Significant axial load exists: Combine this bearing with 7010 / 7210 series precision angular contact ball bearings.

5.3 Lubrication Maintenance Instruction

No lubricant pre-filled at factory. Heavy-duty spindle grease for medium-low speed; oil-air lubrication recommended for medium-high speed. Long-term oil bath lubrication is not advised. Target steady-state temperature rise ≤28K; avoid continuous temperature above 120°C for TN standard polyamide cage. Monitor operating temperature regularly. Slow persistent temperature increase requires inspection for preload decay and lubricant contamination.

5.4 Environmental Application Notes

No built-in seals. Spindle assembly shall be fitted with oil seals or labyrinth seals to block coolant and dust ingress. Long-term axial load and shock loads are prohibited; impact indentations permanently reduce rigidity and machining accuracy. Minimize frequent severe thermal cycling to slow dimensional variation of bearing rings.

6 Fault Identification

Common failure modes: Sustained temperature rise during operation, declining spindle radial rigidity, increased machining chatter marks, periodic abnormal noise, raceway fatigue spalling, roller end face wear. Halt equipment immediately once continuous abnormal noise, obvious rigidity loss or irreparable workpiece chatter occurs. Bearings with fatigue damage on raceways and rollers cannot be repaired and require complete replacement.