1 Model Information & Technical Parameters

Model：N 1009 TN/SP

 

Basic Dimensions

Parameter Value Unit

Bore diameter (d) 45 mm

Outside diameter (D) 75 mm

Width (B) 16 mm

Inner ring flange diameter (d₁) 56.3 mm

Outer ring raceway diameter (E) 67.5 mm

Fillet radius (r₁,₂) 1.0 mm

Permissible axial displacement (max.) 2 mm

Bore type Cylindrical —

Accuracy class SP (Super Precision) —

Performance Data

Parameter Value Unit

Dynamic load rating (C) 29.2 kN

Static load rating (C₀) 32.5 kN

Fatigue load limit (Pᵤ) 3.8 kN

Limiting speed – grease 13,000 r/min

Limiting speed – oil 15,000 r/min

Reference speed 14,000 r/min

Reference grease quantity 2.9 cm³

Axial static stiffness (guideline) 480 N/µm

Operating temperature range -30 ~ +110 (typical) °C

Technical Attributes

Attribute Detail

Bearing type Super-precision single row cylindrical roller bearing

Number of rows 1

Outer ring design Two flanges (integral ribs)

Inner ring design Flangeless

Cage material PA66 (nylon 66) injection moulded cage, roller centred

Roller material Bearing steel (chrome steel)

Seal type Open (no seals)

Bore type Cylindrical

Accuracy class SP

Separable design Yes (inner and outer rings separable)

Logistics & Industry Codes

Parameter Value Unit

Net weight 0.24 kg

eClass code 23-05-08-03 (reference) —

UNSPSC code 31171504 (reference) —

Suffix Explanation

N: Single row cylindrical roller bearing, two flanges on outer ring, flangeless inner ring

 

1009: Dimension series – bore 45 mm (09 × 5 = 45 mm)

 

TN: Injection moulded cage (PA66 nylon 66), roller centred

 

SP: Super Precision accuracy class – dimensional accuracy approx. P5, running accuracy approx. P4

 

Important reminder: This model features a cylindrical bore and can be mounted directly on cylindrical shafts. The bearing is open-type without seals and requires external lubrication and sealing protection based on actual operating conditions. Typical operating temperature range: -30°C to +110°C. The separable design allows independent mounting of inner and outer rings, facilitating assembly and maintenance. SP accuracy class ensures extremely high running accuracy and low vibration levels. The two-flange outer ring and flangeless inner ring allow the bearing to accommodate axial displacement in both directions (max. 2 mm), effectively compensating for thermal expansion.

 

2 Structure & Operating Characteristics

The NMT N 1009 TN/SP is a super-precision single row cylindrical roller bearing (N-type) , specifically developed for high-precision, high-speed applications such as machine tool spindles. This bearing achieves an excellent balance between load capacity, speed and accuracy.

 

Single row roller design is the core structural feature. A single row of cylindrical rollers with line contact between rollers and raceways provides high radial load capacity and low friction characteristics. Compared to double row bearings, the single row design allows higher speeds with less frictional heat generation, making it particularly suitable for high-speed rotation.

 

Two-flange outer ring and flangeless inner ring (N-type design) is another key feature. The outer ring features two integral ribs (flanges) while the inner ring has no flanges, allowing the bearing to accommodate axial displacement in both directions. In applications with significant thermal expansion such as machine tool spindles, thermal elongation of the shaft can be compensated through internal axial displacement, with maximum permissible axial displacement of 2 mm. The bearing itself does not carry axial loads; axial displacement is accommodated by the external structure.

 

Separable design is a significant advantage of N-type cylindrical roller bearings. Inner and outer rings can be mounted independently, which is particularly convenient in interference fit applications – one ring can be mounted first, then the other assembled, greatly simplifying assembly and disassembly.

 

PA66 nylon injection moulded cage (suffix TN) ensures precise roller positioning and stability at high speeds. The cage effectively prevents cylindrical rollers from contacting each other, enabling controlled motion of rolling elements with lower friction, thus achieving higher speeds and reduced heat generation. PA66 material combines light weight with excellent wear resistance.

 

SP Super Precision class is the hallmark of NMT super-precision bearings. SP class bearings achieve dimensional accuracy approximately at P5 level and running accuracy approximately at P4 level, ensuring extremely high running accuracy and low vibration levels to meet high-precision machining requirements.

 

Cylindrical bore design allows direct mounting on cylindrical shafts, with simple installation suitable for most standard spindle configurations.

 

3 Core Performance Advantages

1. Perfect balance of high radial load capacity and low friction. Single row cylindrical roller line contact structure provides high radial load capacity (dynamic load 29.2 kN, static load 32.5 kN) while maintaining low friction characteristics for high-speed rotation.

 

2. Super-precision running accuracy. SP accuracy class (dimensional accuracy P5, running accuracy P4) ensures low vibration, low noise and low heat generation, meeting high-precision machining requirements.

 

3. Bidirectional axial displacement compensation. The two-flange outer ring and flangeless inner ring design allow the bearing to accommodate axial displacement in both directions during operation, with maximum permissible axial displacement of 2 mm, effectively compensating for thermal expansion.

 

4. Separable design for easy assembly and maintenance. Inner and outer rings can be mounted independently, particularly suitable for complex assembly conditions requiring interference fit, greatly simplifying maintenance and replacement.

 

5. PA66 nylon cage for excellent high-speed performance. Grease limiting speed: 13,000 r/min; oil limiting speed: 15,000 r/min, meeting high-speed spindle requirements. The cage effectively reduces friction and heat generation.

 

6. High precision manufacturing with international standard interchangeability. Manufactured from high-quality bearing steel with SP accuracy class, fully interchangeable with SKF N 1009 TN/SP and other equivalent international brand models.

 

4 Typical Application Fields

4.1 Machine Tool Spindles

Machining center spindles, turning center spindles, milling spindles – the combination of high precision and high speed is a perfect match.

 

4.2 Precision Grinding Machines

External cylindrical grinder spindles, internal grinder spindles – high radial load capacity and running accuracy ensure machining quality.

 

4.3 High-Speed Milling and Engraving Equipment

High-speed milling machines, engraving and milling machine spindles – excellent speed performance meets high-speed cutting demands.

 

4.4 Textile Machinery

High-speed spinning machines, weaving machinery – ensuring smooth and efficient operation at high speeds.

 

4.5 Printing Equipment

High-speed printing press roller supports – delivering stability and accuracy in fast-moving components.

 

4.6 Precision Instruments and Testing Equipment

Precision measuring instruments, optical equipment rotary supports – low friction and high running accuracy meet precision measurement requirements.

 

5 Assembly Specifications & Usage Guidelines

5.1 Pre-installation Inspection

Verify model and specifications match design requirements. Inspect bearing appearance to ensure no damage, corrosion or foreign matter. Check shaft dimensional accuracy against design specifications (cylindrical bore design suitable for cylindrical shafts). Prepare appropriate mounting tools.

 

5.2 Installation Procedure

This bearing features a cylindrical bore and can be mounted directly on cylindrical shafts. Use press-fit method or shrink-fit method for installation, with force applied evenly to the end face of the fitted ring. Never apply force through rolling elements or cage. The separable design allows independent mounting of inner and outer rings – the outer ring can be mounted in the housing first, then the inner ring on the shaft, or vice versa.

 

5.3 Installation Notes

For N-type bearings (two-flange outer ring, flangeless inner ring), special attention is required during installation: the flangeless inner ring means the inner ring can slide freely axially on the shaft. Ensure that axial positioning of the shaft is provided by other components (such as lock nuts, shaft shoulders, etc.). Maximum permissible axial displacement is 2 mm – sufficient axial clearance must be预留 in the design.

 

5.4 Lubrication Maintenance

This model comes without pre-filled grease – lubricant must be added during installation based on operating conditions. Grease limiting speed is 13,000 r/min; oil limiting speed is 15,000 r/min. High-quality spindle grease or circulating oil is recommended. Reference grease quantity is 2.9 cm³. Open construction requires reliable sealing protection at the equipment level. Establish regular lubrication replenishment schedule; dry running is strictly forbidden.

 

5.5 Environmental Considerations

Typical operating temperature range: -30°C to +110°C. As this bearing is open construction, in dusty environments or coolant splash conditions, labyrinth seals or contact seals must be provided at the equipment level. The bearing itself does not carry axial loads; axial displacement (max. 2 mm) is accommodated by the external structure. Ensure that axial displacement does not cause interference between the bearing and other components.

 

6 Fault Identification

Common failure modes: Roller or raceway fatigue pitting, abnormal operating noise increase, significant rotation resistance increase, excessive temperature rise, seizure caused by poor lubrication. If cage deformation or rolling element damage occurs, replace the entire bearing assembly – repair and reuse are not allowed. Regularly monitor bearing temperature and vibration for early detection of abnormalities.