1 Model Information & Technical Parameters

Model：N 1014 KPHA/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, purely radial load bearing.

1014: Size series 10 narrow cross-section spindle bearing featuring outstanding high-speed performance.

K: 1:12 taper on inner bore

PHA: Solid heat-resistant polyamide non-metallic roller-guided cage, stable dimension under sustained high temperature.

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：18 000 r/min

Permissible speed, oil-air lubrication：22 000 r/min

Material & Additional Properties

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 permissible.

1014: Series 10 narrow-section spindle bearing. Compact structure reduces friction, prioritizing high rotational speed, widely used for radial support of high-speed finishing spindles.

K: 1:12 tapered inner bore. Axial displacement of inner ring via lock nut enables adjustable preload during assembly.

PHA: Heat-resistant polyamide cage. Higher thermal resistance than standard TN cage, resisting deformation and aging under long-term high-speed operation.

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 supports on-site preload adjustment 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; lubricant should be filled during assembly. Never strike inner or outer ring directly during assembly to prevent indentations on raceways and rollers.

Alternative variants:

N1014 KPHA/SPW33 (1:12 tapered bore, with W33 lubrication groove, supporting continuous on-line re-lubrication)

N1014 TN/SP (straight cylindrical bore, standard polyamide cage, preload non-adjustable, no lubrication groove)

N1014 TN/SPW33 (straight bore with W33 groove, fixed preload for continuous lubrication production line)

N1014 KTN/SP (1:12 tapered bore standard TN cage for normal temperature high-speed conditions)

N1014 KPHA/UP (UP ultra-precision grade for ultra-high precision mirror high-speed grinding spindles)

2 Structure & Operating Characteristics

N 1014 KPHA/SP is an SP-grade precision single row cylindrical roller bearing with C1 minimal radial clearance, KPHA heat-resistant polyamide cage, 1:12 tapered bore and outer ring without lubrication groove. Compact single-row roller layout lowers friction loss, delivering significantly higher limiting speed compared with equivalent double row cylindrical roller bearings. 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.

The core advantage is the 1:12 tapered bore. Axial movement of inner ring driven by lock nut changes effective internal clearance, allowing flexible preload setting during assembly to satisfy different high-speed machining requirements. 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/SP (1:12 tapered bore without W33 groove, SP C1 clearance, heat-resistant cage, on-site adjustable preload, intermittent processing with one-time greasing)

N1014 KPHA/SPW33 (1:12 tapered bore with lubrication groove, adjustable preload plus continuous on-line lubrication for mass high-speed production)

N1014 TN/SP (straight bore without groove, standard cage, fixed interference preload, non-adjustable)

N1014 TN/SPW33 (straight bore with W33 groove, fixed preload for automatic continuous lubrication system)

N1014 KTN/SP (standard TN cage for high-speed operation under normal temperature)

N1014 KPHA/UP (ultra-precision grade for high-speed grinding requiring ultimate rotational accuracy)

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 high limiting speed, suitable for various high-speed finishing processes.

2. 1:12 tapered inner bore enables on-site preload adjustment via lock nut during assembly, flexibly adapting to switching between roughing and finishing.

3. KPHA heat-resistant non-metallic cage maintains excellent dimensional stability under high-temperature high-speed operation, anti-aging with controllable temperature rise.

4. 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.

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

6. Bearing steel construction ensures stable contact performance of raceways and rollers with consistent performance during prolonged high-speed operation.

4 Typical Application Fields

4.1 High-speed vertical machining centers and small high-speed gantry machining center spindle units

Intermittent production, frequent process switching, spindle preload commissioning required, without 24-hour automatic continuous lubrication system

4.2 High-speed CNC cylindrical grinders, jig grinders precision spindles

Small & medium batch high-speed precision grinding, periodic shutdown maintenance for grease filling, adjustable preload and resistance to sustained high temperature required

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

Multi-variety small-batch high-speed finishing, frequent process changeover requiring flexible spindle rigidity tuning

4.4 High-speed test shafts, special precision high-speed rotary components

Repeated preload calibration, elevated operating temperature, 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 adjusted by axially advancing inner ring through lock nut. Tighten nut slowly and evenly during assembly, inspect spindle rotary accuracy and temperature rise in real time to avoid over-preloading and overheating. 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

Intermittent high-speed production, no continuous on-line oil supply, on-site preload adjustment needed, elevated operating temperature → N1014 KPHA/SP

Continuous mass high-speed production, automatic lubrication system, adjustable preload required → N1014 KPHA/SPW33

No on-site preload adjustment needed, intermittent high-speed processing under normal temperature → N1014 TN/SP

No on-site preload adjustment needed, equipped with automatic continuous lubrication system → N1014 TN/SPW33

High-speed operation under normal temperature, cost priority → N1014 KTN/SP

Ultimate rotational accuracy, ultra-high speed mirror grinding → N1014 KPHA/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 widely 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. Raceways and rollers are extremely sensitive to tiny hard particles. Contamination amplifies vibration and rapidly deteriorates high-speed machining accuracy. Severe shock loads should be avoided to prevent permanent indentations on rolling contact surfaces. Although KPHA cage offers improved heat resistance, long-term steady temperature must be controlled below material limit.

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 thermal deformation and abrasion, roller end scuffing and raceway fatigue spalling. Typical failures for tapered bore bearings: persistent overheating caused by excessive preload adjustment; degraded rotary accuracy from insufficient preload; premature wear due to aged and exhausted grease without online replenishment; uneven roller abrasion induced by unexpected axial loads. 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.