1 Model Information & Technical Parameters

Model：NN 3009 TN/SP

Dimensions

Bore d：45 mm

Outer diameter D：75 mm

Width B：30 mm

Bore type: Standard cylindrical bore

Code Explanation

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

3009: Size series 30, size code 09, nominal bore 45 mm; medium cross-section balancing load rigidity and rotational speed

TN: Solid polyamide roller-guided cage, lightweight, low friction to restrain temperature rise at high speed

/SP: Spindle-class super precision, strict standards for dimensional tolerance, raceway geometry and rotational runout

Load Characteristics

Permitted load: Radial load only; axial load capacity negligible and cannot bear axial force independently

Structure: Separable design, inner ring double ribs, TN polyamide cage

Limiting speed: High rigidity double-row roller design combined with low-friction resin cage; oil-air lubrication delivers optimal performance

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

Logistics & Industry Codes

Net weight：0.31 kg

Indicative carbon footprint：0.37 kg CO₂e

eClass code：23-05-09-01

UNSPSC code：31171505

Suffix Explanation

NN: Double row cylindrical roller bearing without outer ribs. Inner and outer rings separable. Dual roller rows deliver far higher radial rigidity than single-row bearings of equal dimensions.

3009: Medium cross-section series with strong load capacity, widely adopted for medium-heavy duty precision turning and grinding spindle units.

TN: Standard polyamide roller-guided cage with low friction loss. Continuous operating temperature ≤120°C. TNHA reinforced cage available for sustained high-speed service.

/SP: Super precision spindle grade, tighter accuracy than standard P4 class, precisely controlled rotational runout to guarantee consistent finishing accuracy.

Important reminder: Ribless outer ring cannot carry axial load alone. Spindle system must be equipped with matched precision angular contact ball bearings to withstand axial forces. Continuous operating temperature over 120°C is prohibited for TN cage. Preload is fixed by spacers for straight bore design and cannot be adjusted after assembly. Hammer impact assembly forbidden; thermal mounting or hydraulic tooling recommended. Taper bore adjustable alternative: NN3009 KTN/SP. Reinforced cage variant: NN3009 TNHA/SP. VQ497 suffix is optional for stabilized heat treatment.

2 Structure & Operating Characteristics

NN 3009 TN/SP super precision double row cylindrical roller bearing provides excellent radial load capacity and rigidity via dual roller rows, suitable for medium and heavy radial cutting loads. Standard cylindrical bore fits mass production lines of standardized spindle modules with fixed preload set by spacers. TN polyamide cage reduces frictional heat generation. /SP super precision machining minimizes rotational runout and stabilizes finishing accuracy. Separable ring structure facilitates disassembly, spindle maintenance and component replacement.

Selection reference:

NN3009 TN/SP (straight bore standard polyamide cage + SP super precision, mass-produced preset-preload heavy-duty spindle modules)

NN3009 KTN/SP (1:12 taper bore standard polyamide cage SP grade, spindles with adjustable preload on assembly)

NN3009 TNHA/SP (straight bore reinforced polyamide cage SP grade, sustained high-speed applications)

NN3009 TN/SP/VQ497 (straight bore polyamide cage SP grade + stabilized heat treatment for non-stop mass production equipment)

7009 angular contact ball bearings: Paired to bear spindle axial loads.

3 Core Performance Advantages

1. Double-row roller configuration offers superior radial rigidity and load capacity compared to bearings of identical size with single row, suitable for medium-heavy cutting processes.

2. Standard cylindrical inner bore compatible with mass production of modular spindles; fixed preload via spacers ensures consistent assembly quality.

3. TN polyamide roller-guided cage is lightweight with low friction, effectively controlling temperature rise during medium and high-speed operation.

4. /SP super precision grade delivers tightly controlled rotational runout, maintaining stable processing accuracy for grinding and precision turning.

5. Separable inner and outer rings simplify assembly, maintenance and replacement for standardized spindle units on production lines.

4 Typical Application Fields

4.1 Mass-Produced Medium-Heavy Duty Precision Spindle Modules

Standardized CNC lathe spindles, general cylindrical grinder spindles, hob grinder spindle units, small & medium turn-mill spindles

4.2 Modular mass-assembly heavy-duty high-speed rotary units without on-site preload adjustment

Modular grinding power heads, heavy-duty precision rotary tables, precision roll support units

4.3 Precision rotary machinery with considerable radial load, priority on rigidity & rotational accuracy, adopting spacer preset preload

5 Assembly Specifications & Usage Guidelines

5.1 Assembly Environment & Operation Standards

Precision bearing assembly shall be carried out in clean, dust-free constant-temperature workshop. All mating components must be thoroughly cleaned of chips, oil and contaminants. Preload is accurately controlled by precision spacers; forced squeezing to create preload is forbidden. Never strike bearing face; thermal mounting or dedicated hydraulic pressing tooling is recommended. Conduct extended no-load temperature run-in after assembly. Shaft journal and housing bore geometric tolerances shall comply with /SP precision bearing standards. Observe TN cage temperature limit to avoid long-term over-temperature operation.

5.2 Selection Guidance

Mass production standardized modules, spacer preset preload, medium-heavy cutting duty → NN3009 TN/SP

On-site flexible preload adjustment required → NN3009 KTN/SP

Continuous long-term high-speed operation, reinforced cage needed → NN3009 TNHA/SP

Non-stop mass production with requirement to restrain dimensional shift → NN3009 TN/SP/VQ497

Significant axial load exists: Combine this bearing with matched 7009 series precision angular contact ball bearings.

5.3 Lubrication Maintenance Instruction

No lubricant pre-filled at factory. Heavy-duty high-speed spindle grease for medium-low speed; oil-air lubrication recommended for high speed. Long-term oil bath lubrication is not advised. Target steady-state temperature rise ≤28K; avoid continuous temperature over 120°C for TN polyamide cage. Inspect preload setting and lubricant supply if temperature rises persistently and abnormally.

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; shock indentations permanently damage rotational precision. Frequent severe thermal cycling should be avoided to slow dimensional variation of bearing.

6 Fault Identification

Common failure modes: Abnormal temperature rise during operation, gradual increase of spindle radial runout, periodic abnormal noise, raceway impact indentations, stress spalling on roller edges, continuous deterioration of machining accuracy. Stop equipment immediately once accuracy drops obviously or continuous abnormal noise appears. Bearings with damaged raceways or rollers cannot be repaired and require complete replacement.