1 Model Information & Technical Parameters

Model：N 1013 KTN/SP

Dimensions

Bore d：65 mm

Outer diameter D：100 mm

Width B：18 mm

Bore type: 1:12 tapered bore

Radial clearance: C1 minimal internal clearance

Accuracy class: SP precision grade

Structure: N single row design, inner ring with two ribs, ribless outer ring, rollers free for axial floating

Outer ring flange: None

Seal: Open design, no seals

Surface coating: Uncoated

Pre-lubrication: No lubricant supplied from factory

Re-lubrication feature: No lubrication groove & oil holes on outer ring, not for on-line re-lubrication

Code Explanation

N: Single row cylindrical roller bearing, two ribs on inner ring, ribless outer ring. Rollers are axially floatable, only suitable for radial loads.

1013: Size series 10 ultra-slim cross-section single row bearing, compact structure with superior high-speed capability.

K: 1:12 tapered bore; preload and internal clearance can be adjusted axially by lock nut.

TN: Solid polyamide non-metallic roller-guided cage featuring low friction and low noise at high speed.

SP: Precision accuracy grade with strictly controlled rotational runout for high-speed precision machine tool spindles.

Load & Speed Data

Basic dynamic load rating Cr：44.6 kN

Basic static load rating C0r：58.5 kN

Permissible speed, grease lubrication：10 000 r/min

Permissible speed, oil-air lubrication：11 000 r/min

Material & Additional Properties

Material: Bearing steel

Indicative carbon footprint：1.6 kg CO₂e

Net weight：0.441 kg

eClass code：23-05-09-01

UNSPSC code：31171505

Suffix Explanation

N: Single row cylindrical roller bearing with double-rib inner ring and ribless outer ring. Rollers can float axially. The bearing cannot withstand axial loads and can compensate thermal elongation of the spindle.

1013: Ultra-slim Series 10 bearing, narrow width saves installation space, prioritized for high-speed applications.

K: 1:12 tapered bore. Axial pushing via lock nut expands inner ring radially, enabling continuous adjustment of clearance and preload during assembly.

TN: Polyamide cage, lightweight non-metallic construction with low friction coefficient, excellent temperature control for long-term medium-high speed running.

SP: Precision accuracy grade. Dimensional tolerance, radial and axial runout are tighter than standard bearings to guarantee high-speed machining precision.

C1 clearance: Minimal radial internal clearance, commonly used in lightly preloaded spindle systems to suppress vibration at high rotational speed.

Important reminder: This 1:12 tapered bore N-type single row cylindrical roller bearing has no outer ring lubrication groove or oil holes. On-line continuous lubricant replenishment during machine operation is not available. It fits intermittent lubrication or one-time grease filling during assembly. Thanks to the floating roller design, this bearing cannot bear axial loads, matched angular contact ball bearings or thrust bearings must be arranged to absorb all axial forces. Preload adjustment via lock nut must be operated gently; excessive tightening will eliminate clearance completely and cause raceway overheating damage. Open bearing without built-in seals; labyrinth seals or oil seals must be installed on housings to block coolant and dust ingress. No pre-filled grease upon delivery; lubricant should be filled during assembly. Never strike inner or outer ring directly during assembly to prevent indentations on raceways and rollers.

Alternative variants:

N1013 TN/SPW33 (straight bore, W33 lubrication groove, support on-line re-lubrication)

N1013 KTN/SPW33 (1:12 tapered bore, W33 lubrication groove, adjustable preload + on-line re-lubrication)

N1013 KTNHA/SP (high-temperature polyamide cage for high ambient temperature)

N1013 KTN/UP (UP ultra-precision grade for ultra-high speed mirror machining spindles)

2 Structure & Operating Characteristics

N 1013 KTN/SP is an ultra-slim single row precision cylindrical roller bearing, SP accuracy class with C1 minimal radial clearance, TN polyamide cage, 1:12 tapered bore and non-grooved outer ring. The compact single-row layout delivers outstanding high-speed performance and stable radial load capacity, widely used as radial support for high-speed precision machine tool spindles. N-type double-rib inner ring and ribless outer ring allow axial floating of rollers, which absorbs thermal elongation of the spindle under temperature rise and avoids thermal compressive stress.

The core advantage is adjustable preload through 1:12 tapered bore. Preload can be tuned on-site with lock nuts without tight tolerance control on shaft journals, simplifying assembly work. Without outer ring lubrication channels, it is not recommended for non-stop production requiring continuous on-line greasing; better suited for intermittent processing with periodic shutdown maintenance. Open construction supports oil-air lubrication, circulating oil lubrication and one-time grease filling. Combined C1 minimal clearance and precision manufacturing tolerances reduce rotary vibration at high speed and stabilize workpiece surface finish.

Selection guide:

N1013 KTN/SP (1:12 tapered bore, no lubrication groove, SP C1 clearance, spindles needing adjustable preload & intermittent lubrication)

N1013 KTN/SPW33 (1:12 tapered bore with W33 groove, adjustable preload plus continuous on-line lubrication)

N1013 TN/SPW33 (straight bore, fixed interference fit, support continuous re-lubrication)

N1013 KTNHA/SP (heat-resistant cage for high ambient temperature)

N1013 KTN/UP (ultra-precision grade for optical and ultra-high speed mirror finishing equipment)

Recommended matching bearing: Paired 7013 SP angular contact ball bearings to carry all axial loads.

3 Core Performance Advantages

1. N-type single row ultra-slim structure features excellent limiting rotational speed, compact size to save spindle installation space.

2. K-type 1:12 tapered bore enables on-site preload adjustment by lock nut, lowering machining requirements for shaft journals and improving assembly flexibility.

3. TN polyamide non-metallic cage ensures stable rotation and low friction, resulting in lower temperature rise and noise under high-speed operation.

4. SP precision standard together with C1 minimal radial clearance achieves tight control over rotational runout, mitigates high-speed vibration and stabilizes dimensional accuracy in finishing processes.

5. N floating structure allows axial movement of rollers, capable of compensating spindle thermal elongation and removing thermal compression stress.

6. Bearing steel guarantees stable contact performance of raceways and rollers for consistent operation.

4 Typical Application Fields

4.1 High-speed vertical & horizontal machining center spindle units

Finishing spindles of medium-sized high-speed machining centers for intermittent production with periodic shutdown greasing

4.2 Jig grinders, CNC tool grinders and high-speed cylindrical grinders

Precision grinding machines requiring accurate spindle preload setting, prioritizing high rotating speed and low vibration

4.3 Precision high-speed CNC lathes and turn-mill composite machine spindles

Medium-small batch high-speed finishing equipment without continuous automatic lubrication system

4.4 Other high-end precision high-speed intermittently operating rotary components

Precision rotating machinery demanding radial load capacity, adjustable preload, thermal elongation compensation and regular maintenance

5 Assembly Specifications & Usage Guidelines

5.1 Assembly Environment & Operation Standards

SP precision bearings should be assembled in constant-temperature dust-free clean workshops. Thoroughly remove contaminants on shaft journals, housing bores and spacer contact surfaces. Preload is adjusted by axially pushing inner ring with lock nut. Operate slowly, monitor no-load temperature rise and vibration during adjustment to avoid excessive preload. No circumferential positioning requirement for outer ring without lubrication holes. After assembly, implement low-speed gradual speed-up no-load running-in. Reliable sealing must be installed on machine housings to prevent coolant and dust from reaching rolling surfaces. This bearing cannot withstand axial loads; all axial forces must be supported by matched angular contact bearings.

5.2 Selection Guidance

On-site preload adjustment required, intermittent lubrication, no continuous on-line oil supply → N1013 KTN/SP

Adjustable preload plus continuous automatic lubrication system equipped → N1013 KTN/SPW33

No on-site preload adjustment needed, continuous re-lubrication required → N1013 TN/SPW33

Production line with high ambient temperature and continuous operation → KTNHA high-temperature cage version

Ultra-precision ultra-high speed mirror machining requiring top-tier rotary accuracy → N1013 KTN/UP

Important notice: No outer ring lubrication groove for this model, continuous lubricant replenishment during running is impossible. N floating structure does not support axial loads; dedicated axial support bearings are mandatory to bear all axial force.

5.3 Lubrication Maintenance Instruction

No lubricant pre-filled at factory. Oil-air lubrication is preferred to reach maximum permissible speed; one-time grease filling during assembly is acceptable for intermittent medium-low speed machining. Periodic shutdown for regreasing is necessary, on-line greasing cannot be realized. Monitor bearing temperature regularly and avoid prolonged overheating. Long-term insufficient lubrication will cause premature wear of rollers and cage.

5.4 Environmental Application Notes

Open structure without built-in seals; labyrinth seals or oil seals on housings are compulsory. Raceways and rollers are extremely sensitive to tiny hard particles. Contamination amplifies vibration and rapidly deteriorates machining accuracy. Frequent shock loads should be avoided to prevent indentations on rolling contact surfaces.

6 Fault Identification

Common failure modes: rising vibration during high-speed cutting, regular texture patterns on machined workpieces, sustained abnormal spindle temperature increase, periodic rotational noise, cage abrasion, roller end scuffing and raceway fatigue spalling. Typical problems for tapered bore bearings include excessive preload leading to persistent overheating, and insufficient lubrication caused by lack of regular regreasing. If matched axial bearing fails and axial force transfers to this bearing, edge stress concentration and roller end scuffing will easily occur. Shut down equipment immediately upon persistent abnormal noise or irreversible accuracy degradation. Bearings with permanent damage to raceways, rollers or cage cannot be repaired and need complete replacement.