1 Model Information & Technical Parameters

Model：N 1014 KTNHA/SP

Dimensions

Bore d：70 mm

Outer diameter D：110 mm

Width B：20 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 allowing 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 circumferential lubrication groove & oil holes on outer ring, continuous on-line re-lubrication not available

Code Explanation

N: Single row cylindrical roller bearing, two ribs on inner ring, ribless outer ring with axial floating capacity to compensate spindle thermal elongation, suitable purely for radial loads.

1014: Size series 10 narrow cross-section spindle bearing for machine tool application.

K: 1:12 tapered bore, preload adjustable on assembly site via lock nut.

TNHA: Non-metallic roller-guided cage, low friction and controlled temperature rise.

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

Load & Speed Data

Basic dynamic load rating Cr：55 kN

Basic static load rating C0r：72 kN

Permissible speed, grease lubrication：13 000 r/min

Permissible speed, oil-air lubrication：19 000 r/min

Material & Additional Properties

Rolling element material: Bearing steel

Indicative carbon footprint：2.3 kg CO₂e

Net weight：0.614 kg

eClass code：23-05-09-01

UNSPSC code：31171505

Suffix Explanation

N: Single row cylindrical roller bearing. Two ribs on inner ring guide rollers; ribless outer ring floats axially to absorb thermal expansion. Only radial loads can be supported, axial loads are not recommended.

1014: Series 10 narrow-section spindle bearing with compact structure to fit limited installation space of machine spindles.

K: 1:12 tapered bore. Axial tightening of lock nut expands inner ring, enabling on-site preload adjustment to adapt spindle rigidity to varying machining processes.

TNHA: Non-metallic cage. Light weight reduces friction and temperature rise under high rotation speed.

SP: Precision accuracy grade. Dimensional tolerance, radial and axial runout are tighter than standard bearings to sustain stable precision during continuous machining.

C1 clearance: Minimal radial internal clearance, matched for lightly preloaded high-speed spindle systems to suppress vibration and improve workpiece surface finish.

Important reminder: This 1:12 tapered bore N-type single row cylindrical roller bearing with steel rollers allows on-site preload adjustment by tightening lock nut; preload can be modified during assembly. No W33 circumferential lubrication groove on outer ring, cannot connect to continuous automatic lubrication circuits, only suitable for intermittent production with one-time grease filling during mounting. N-type floating outer ring bears pure radial loads and cannot withstand axial forces; spindle axial positioning must be undertaken by paired angular contact ball bearings. 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. Control tightening torque during tapered bore assembly to avoid excessive preload and overheating. Steel rollers provide stable load capacity with moderate limiting speed compared to composite roller versions.

Alternative variants:

N1014 KPHA/HC5SP (1:12 tapered bore, composite rollers, non-metallic cage, no lubrication groove, SP C1 clearance, higher limiting speed)

N1014 KTNHA/SPW33 (1:12 tapered bore, steel rollers, outer ring W33 groove supporting continuous re-lubrication)

N1014 TNHA/SP (straight cylindrical bore, non-metallic cage, steel rollers, fixed preload)

N1014 KTNHA/UP (1:12 tapered bore, UP ultra-precision grade for high-precision grinding spindles)

2 Structure & Operating Characteristics

N 1014 KTNHA/SP is an SP-grade precision single row cylindrical roller bearing with C1 minimal radial clearance, TNHA non-metallic cage, steel rolling elements, 1:12 tapered bore and outer ring without lubrication groove. Compact single-row steel roller layout delivers reliable rigidity and good load capacity. The N design with ribless outer ring allows free axial sliding to automatically compensate spindle thermal expansion and avoid extra axial stress induced by temperature rise.

It adopts 1:12 tapered bore structure. Preload can be flexibly tuned with lock nut on assembly site, suitable for flexible production lines with frequent process changes. Non-metallic cage reduces friction heat generation, and bearing steel rollers feature high mechanical strength and stable load resistance. Without outer ring W33 channel, uninterrupted re-lubrication during running is impossible, only applicable to intermittent processing equipment with scheduled downtime for grease replenishment. Combined C1 minimal clearance and precision manufacturing tolerances suppress rotary vibration at high speeds and guarantee surface quality in precision finishing.

Selection guide:

N1014 KTNHA/SP (1:12 tapered bore, steel rollers, non-metallic cage, no W33 groove, SP C1 clearance, adjustable preload, stable load, medium-high speed, intermittent processing with one-time greasing)

N1014 KTNHA/SPW33 (1:12 tapered bore, steel rollers with lubrication groove, adjustable preload plus continuous on-line lubrication)

N1014 KPHA/HC5SP (1:12 tapered bore, composite rollers, non-metallic cage, higher limiting speed, relatively lower load capacity)

N1014 TNHA/SP (straight bore, non-metallic cage, steel rollers, fixed preload)

N1014 KTNHA/UP (1:12 tapered bore, ultra-precision grade for mirror surface precision grinding)

Recommended matching bearing: Paired 7014 SP angular contact ball bearings to bear all axial loads and realize bidirectional spindle axial positioning.

3 Core Performance Advantages

1. N-type single-row narrow-section steel roller design provides high mechanical strength and stable load performance, balancing rigidity and medium-high speed machining demands.

2. 1:12 tapered bore with lock nut allows flexible on-site preload adjustment, satisfying diversified spindle rigidity requirements for different machining processes.

3. Lightweight TNHA non-metallic cage lowers friction loss and effectively controls temperature rise at high rotation speed.

4. Bearing steel rolling elements feature excellent fatigue resistance and stronger stability under loaded conditions.

5. SP precision standard combined with C1 minimal radial clearance delivers tight control over rotational runout, mitigates high-speed vibration and stabilizes machining accuracy and surface finish.

6. Axially floating outer ring automatically compensates spindle thermal elongation and prevents abnormal additional stress inside the bearing.

4 Typical Application Fields

4.1 High-speed vertical machining center spindle units for flexible multi-variety production

Frequent workpiece switching requiring regular spindle rigidity adjustment, intermittent production, no 24-hour automatic continuous lubrication system

4.2 High-speed CNC cylindrical grinders precision spindles

Demanding stable load capacity and consistent machining precision, small & medium batch precision grinding, periodic shutdown maintenance for grease filling

4.3 Standardized high-speed precision CNC lathes and turn-mill composite production spindles

Frequent process adjustment supporting switching between rough and finish machining, flexible preload requirement

4.4 General high-speed precision rotary spindle equipment

High requirements for load stability, continuous medium-high speed operation, without uninterrupted automatic oil supply circuit

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. For 1:12 tapered bore bearings, preload is modified by axial advance of lock nut; adjust gradually to avoid overload preload. No lubrication groove on outer ring; grease can only be filled during assembly, formulate regular shutdown maintenance plan for supplementary greasing. Reliable sealing must be installed on machine housings to prevent coolant and dust from reaching rolling surfaces. This N-type bearing cannot withstand axial loads, paired angular contact bearings are mandatory for spindle axial positioning.

5.2 Selection Guidance

Frequent process change, on-site adjustable preload required, priority to load stability, medium-high speed, intermittent high-speed production, no continuous on-line oil supply → N1014 KTNHA/SP

Flexible production line equipped with continuous automatic lubrication, adjustable preload, stable load operation → N1014 KTNHA/SPW33

Pursuing higher limiting speed with relatively mild load conditions → N1014 KPHA/HC5SP

Fixed machining process without preload adjustment, stable medium-high load operation → N1014 TNHA/SP

Ultimate rotational accuracy, precision mirror grinding → N1014 KTNHA/UP

Important notice: No outer ring lubrication groove for this model, lubricant cannot be replenished while equipment is running, periodic maintenance schedule is mandatory. N structure is designed purely for radial loads; continuous accidental axial force triggers edge stress concentration, roller scuffing and premature fatigue failure.

5.3 Lubrication Maintenance Instruction

No lubricant pre-filled at factory. Oil-air lubrication is recommended to achieve maximum permissible rotational speed; grease one-time filling is adopted for intermittent working conditions. Lacking outer ring oil groove, grease cannot be supplemented into bearing without machine shutdown. Set maintenance cycle according to operating conditions, shut down periodically to disassemble end caps for re-greasing; prevent premature wear caused by long-term insufficient lubrication. Continuously monitor bearing temperature. Stop operation immediately once abnormal temperature rise occurs to inspect preload and lubrication status.

5.4 Environmental Application Notes

Open structure without built-in seals; labyrinth seals or oil seals on housings are compulsory. Rolling contact surfaces are extremely sensitive to tiny hard particles. Contamination amplifies vibration and rapidly deteriorates high-speed machining accuracy. Steel rollers feature good load resistance, yet continuous severe shock loads shall be avoided to prevent permanent damage of rolling elements.

6 Fault Identification

Common failure modes: steadily rising vibration during high-speed cutting, regular texture patterns on machined workpieces, abnormal continuous spindle temperature increase, periodic rotational noise, cage abrasion & deformation, scuffing of rolling elements and raceway fatigue spalling. Typical failures for tapered bore bearings: improper lock nut adjustment leads to over-preloading with persistent overheating or insufficient preload causing accuracy degradation; premature wear due to aged and exhausted grease without online replenishment; uneven abrasion induced by unexpected axial loads; raceway fatigue damage under long-term overloaded operation. Shut down equipment immediately upon persistent abnormal noise or irreversible accuracy degradation. Bearings with permanent damage to raceways, rolling elements or cage cannot be repaired and need complete replacement.