1 Model Information & Technical Parameters

Model：N 1014 KPHA/HC5SP

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 featuring outstanding high-speed performance.

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

PHA: Non-metallic composite roller-guided cage, lightweight, low friction and low heat generation.

HC5: Composite rolling elements, reduced rotational inertia for higher limiting speed.

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：53.9 kN

Basic static load rating C0r：69.5 kN

Permissible speed, grease lubrication：20 000 r/min

Permissible speed, oil-air lubrication：24 000 r/min

Material & Additional Properties

Rolling element material: Composite material

Indicative carbon footprint：2.0 kg CO₂e

Net weight：0.549 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. Compact structure reduces friction, optimized for ultra-high rotational speed.

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.

PHA: Non-metallic composite cage. Light weight lowers windage loss and operating temperature at high rotational speed.

HC5: Composite rolling elements. Less rotating mass mitigates centrifugal force and lifts maximum permissible speed.

SP: Precision accuracy grade. Dimensional tolerance, radial and axial runout are tighter than standard bearings to sustain stable precision at high rotational speeds.

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 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.

Alternative variants:

N1014 KPHA/SP (1:12 tapered bore, steel rollers, non-metallic cage, no lubrication groove, SP C1 clearance)

N1014 KPHA/HC5SPW33 (1:12 tapered bore, composite rollers, outer ring W33 groove supporting continuous re-lubrication)

N1014 PHA/SP (straight cylindrical bore, machined metal cage, steel rollers, fixed preload)

N1014 PHA/HC5UP (straight bore, composite rollers, UP ultra-precision grade for ultra-high speed grinding spindles)

2 Structure & Operating Characteristics

N 1014 KPHA/HC5SP is an SP-grade precision single row cylindrical roller bearing with C1 minimal radial clearance, KPHA non-metallic composite cage, HC5 composite rolling elements, 1:12 tapered bore and outer ring without lubrication groove. Compact single-row roller layout lowers friction loss and delivers excellent limiting speed. 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. Composite cage together with HC5 composite rollers reduce self-weight and rotational inertia, cutting heat generation and achieving higher limiting speed than equivalent bearings with steel rollers. 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 high-speed finishing.

Selection guide:

N1014 KPHA/HC5SP (1:12 tapered bore, composite rollers, non-metallic cage, no W33 groove, SP C1 clearance, adjustable preload, ultra-high speed, intermittent processing with one-time greasing)

N1014 KPHA/HC5SPW33 (1:12 tapered bore, composite rollers with lubrication groove, adjustable preload plus continuous on-line lubrication for mass flexible production)

N1014 KPHA/SP (1:12 tapered bore, steel rollers, non-metallic cage, adjustable preload, moderate speed, cost effective)

N1014 PHA/SP (straight bore, machined metal cage, steel rollers, fixed preload, high temperature & shock resistance)

N1014 PHA/HC5UP (straight bore, composite rollers, ultra-precision grade for mirror surface 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 roller design reduces friction and achieves outstanding limiting speed, suitable for various ultra-high-speed finishing processes.

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 KPHA non-metallic composite cage lowers friction loss and operating temperature at high rotation speed.

4. HC5 composite rolling elements reduce rotational inertia and centrifugal effects to further raise the upper limit of permissible rotational speed.

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, mirror grinders precision spindles

Demanding ultimate rotational speed and strict temperature control, small & medium batch precision grinding, periodic shutdown maintenance for grease filling

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

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

4.4 High-speed precision test shafts, high-speed rotary testing equipment

Continuous high-speed operation with strict limits on temperature rise and vibration, high-precision rotating machinery 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, pursuing ultra-high speed, strict temperature control, intermittent high-speed production, no continuous on-line oil supply → N1014 KPHA/HC5SP

Flexible production line equipped with continuous automatic lubrication, adjustable preload, ultra-high speed operation → N1014 KPHA/HC5SPW33

Adjustable preload required, moderate speed demand, cost priority → N1014 KPHA/SP

Fixed machining process without preload adjustment, elevated operating temperature and shock loads → N1014 PHA/SP

Ultimate rotational accuracy, ultra-high speed mirror grinding → N1014 PHA/HC5UP

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. Avoid long-term extreme high-temperature continuous operation for composite rolling elements.

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. Composite components are more sensitive to high 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. Composite cage and rolling elements excel in lightweight performance, yet long-term extreme high temperature and sustained heavy shock environments are not recommended. Severe shock loads should 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; aging and degradation of composite components under prolonged over-temperature. 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.