1 Model Information & Technical Parameters

Model：N 1009 KTNHA/SP

Dimensions

Bore d：45 mm

Outer diameter D：75 mm

Width B：16 mm

Bore type: 1:12 tapered bore

Code Explanation

N: Single row cylindrical roller bearing, inner ring double ribs, outer ring ribless, separable inner and outer rings

1009: Size series 10, size code 09, nominal bore 45 mm (10 series = ultra-light cross-section for high speed)

K: 1:12 tapered bore, preload adjustable by axial compression of inner ring

TNHA: Reinforced solid polyamide roller-guided cage, higher structural strength than standard TN cage, improved resistance to high-speed centrifugal force

/SP: Super precision spindle grade, higher accuracy than standard P4

Load Characteristics

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

Structure: Separable design, inner ring double ribs, TNHA reinforced polyamide cage

Limiting speed: Compact 10-series cross-section plus low-friction resin cage delivers superior limiting speed; performance depends on lubrication, oil-air lubrication achieves best results

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

Logistics & Industry Codes

Net weight：0.21 kg

Indicative carbon footprint：0.29 kg CO₂e

eClass code：23-05-09-01

UNSPSC code：31171505

Suffix Explanation

N: Single row cylindrical roller bearing without outer ribs. Inner and outer rings separable; rollers positioned by inner ring ribs.

1009: Ultra-light 10 cross-section series with compact short rollers, optimized for high-speed light-duty spindles.

K: 1:12 tapered bore. Lock nut axially expands inner ring to set preload accurately during assembly.

TNHA: Reinforced polyamide cage with structural reinforcement to withstand high centrifugal load at high speed. Continuous operating temperature ≤120°C.

/SP: Super precision grade with tight tolerances on raceway geometry and rotational runout for finishing and high-speed grinding spindles.

Important reminder: Ribless outer ring cannot sustain axial load alone. Spindle must be equipped with matched precision angular contact ball bearings for axial support. Avoid continuous temperature above 120°C for TNHA cage; brass cage variant recommended for high-temperature applications. Preload must be precisely controlled for tapered bore; excessive preload causes overheating and premature failure. Hammer impact assembly prohibited; hydraulic nut pressing or thermal mounting recommended. Straight bore alternative: N1009 TNHA/SP. Brass cage variant: N1009 K/SP. Higher precision: N1009 KTNHA/UP. Stabilized heat treatment suffix VQ497 is optional.

2 Structure & Operating Characteristics

N 1009 KTNHA/SP super precision single row cylindrical roller bearing adopts ultra-light 10-series cross-section, balancing radial rigidity and maximum achievable rotational speed. The 1:12 tapered bore enables flexible preload tuning during assembly. Reinforced TNHA polyamide cage features higher stiffness, minimal deformation under high centrifugal force, low friction and stable temperature control. /SP ultra-precision machining minimizes rotational runout to stabilize high-speed finishing accuracy. Separable rings simplify spindle disassembly and maintenance.

Selection reference:

N1009 KTNHA/SP (taper bore + reinforced polyamide cage + SP grade, light high-speed spindle with adjustable preload)

N1009 TNHA/SP (straight bore reinforced polyamide cage SP grade, preset-preload high-speed spindle modules)

N1009 K/SP (taper bore brass cage SP grade, continuous high-temperature service)

N1009 KTNHA/UP (taper bore reinforced polyamide cage UP ultra-precision for high-speed ultra-precise grinders)

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

3 Core Performance Advantages

1. Ultra-light 10-series single-row roller construction provides sufficient radial rigidity while delivering extremely high limiting speed for light high-speed spindles.

2. 1:12 tapered bore allows precise preload adjustment to adapt to various speed ranges and cutting loads.

3. TNHA reinforced polyamide cage offers better resistance to high centrifugal force than ordinary TN cage, ensuring stable operation and lower heat generation at high speed.

4. /SP super precision grade guarantees minimal rotational runout to satisfy accuracy demands of high-speed precision cutting and grinding.

5. Separable inner and outer rings simplify disassembly, maintenance and bearing replacement of high-speed spindle assemblies.

4 Typical Application Fields

4.1 Light-Duty High-Speed Precision Machine Tool Spindles

High-speed vertical machining center spindles, high-speed CNC lathe spindles, internal grinder spindles, high-speed engraving & milling machine spindles

4.2 Precision high-speed rotary units requiring high rotating speed and low heat

High-speed precision grinding heads, high-speed precision dividing units, compact high-speed CNC rotary tables

4.3 Medium radial load rotary machinery targeting maximum rotational speed, requiring on-site preload adjustment and strict temperature control

5 Assembly Specifications & Usage Guidelines

5.1 Assembly Environment & Operation Standards

Precision bearing assembly should be completed in clean, dust-free constant-temperature workshop. All mating components must be thoroughly cleaned to remove chips and contaminants. Apply uniform axial preload via hydraulic nut on tapered bore inner ring; striking bearing face is forbidden. Preload magnitude must be accurately controlled to avoid overheating. Conduct extended no-load temperature run-in after assembly. Geometric tolerances of shaft journal and housing bore must match tolerance class for /SP precision spindle bearings. Observe temperature limit of TNHA cage and avoid prolonged over-temperature operation.

5.2 Selection Guidance

Light high-speed spindle, adjustable preload, priority on high-speed temperature control → N1009 KTNHA/SP

Sustained high operating temperature, higher cage heat resistance required → N1009 K/SP

No on-site preload adjustment needed, spacer preset preload structure → N1009 TNHA/SP

Ultra-precision high-speed processing equipment → N1009 KTNHA/UP

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. High-speed spindle grease for medium-low speed; oil-air lubrication mandatory for high-speed applications. Long-term oil bath lubrication is not recommended. Target steady-state temperature rise ≤25K; avoid continuous temperature over 120°C for TNHA polyamide cage. Check preload and lubrication supply if temperature rises persistently and abnormally.

5.4 Environmental Application Notes

No built-in seals. Spindle assembly must install oil seals or labyrinth seals to block coolant and dust ingress. Long-term axial load and shock loads are prohibited; shock indentations permanently destroy rotational precision. Frequent thermal cycling should be avoided to slow dimensional variation.

6 Fault Identification

Common failure modes: Abnormal temperature rise at high speed, gradual increase of spindle radial runout, periodic abnormal noise, raceway indentations, edge stress spalling on rollers. Halt operation immediately once accuracy declines obviously or continuous abnormal noise occurs. Bearings with damaged raceways or rollers cannot be repaired and require complete replacement.