1 Model Information & Technical Parameters

Model：N 1012 TN/SP

Dimensions

Bore d：60 mm

Outer diameter D：95 mm

Width B：18 mm

Bore type: Straight cylindrical bore

Radial clearance: C1 minimal internal clearance

Accuracy class: SP precision grade

Structure: Inner ring with two ribs, ribless outer ring, separable inner and outer rings

Outer ring flange: None

Seal: Open design, no seals

Surface coating: Uncoated

Pre-lubrication: No lubricant supplied from factory

Re-lubrication feature: Not equipped

Code Explanation

N: Single row cylindrical roller bearing, inner ring double ribs, ribless outer ring, outer ring allowed axial displacement

1012: Size series 10, light narrow cross-section balancing load capacity and medium-high speed performance

TN: Solid polyamide non-metallic roller-guided cage with low friction

SP: Precision accuracy grade with controlled rotational runout for precision spindle machining

Load & Speed Data

Basic dynamic load rating Cr：42.9 kN

Basic static load rating C0r：53 kN

Permissible speed, grease lubrication：11 000 r/min

Permissible speed, oil-air lubrication：12 000 r/min

Material & Additional Properties

Material: Bearing steel

Indicative carbon footprint：1.6 kg CO₂e

Net weight：0.423 kg

eClass code：23-05-09-01

UNSPSC code：31171505

Suffix Explanation

N: Single row cylindrical roller bearing with double-ribbed inner ring and ribless outer ring. The outer ring can float axially to compensate thermal elongation of shaft and eliminate extra axial stress caused by temperature rise.

1012: Lightweight Series 10 narrow cross-section, low self-weight and rolling friction, suitable for medium-high speed precision spindle applications.

TN: Standard polyamide cage, non-metallic structure, low operating noise for stable continuous operation.

SP: Precision accuracy grade. Strict control on dimensional tolerance, radial and axial runout compared to standard bearings to guarantee machining precision.

C1 clearance: Minimal radial internal clearance, designed for preloaded precision spindle units to suppress vibration under medium-high rotating speed.

Important reminder: The outer ring can move axially; this bearing cannot bear axial loads independently. It has to be matched with angular contact ball bearings for axial load support. C1 minimal clearance is sensitive to fit tolerance and operating temperature; assembly interference needs precise control. No built-in seals; labyrinth seals or oil seals must be installed on housing to prevent ingress of coolant and dust. No pre-filled grease from factory, external independent lubrication system is required. Hammering bearing during assembly is forbidden to avoid indentation damage on raceways and rollers.

Alternative variants:

N1012 TN (standard precision, cylindrical bore polyamide cage)

N1012 TN/SP (SP precision grade + C1 clearance, preferred for precision spindles)

N1012 KTN/SP (1:12 tapered bore, TN cage, SP grade with adjustable preload)

N1012 TNHA/SP (high-temperature polyamide cage for long-term continuous operation)

N1012 TN/UP (UP ultra-precision grade for ultra-precision mirror machining equipment)

2 Structure & Operating Characteristics

N 1012 TN/SP is a lightweight single row precision cylindrical roller bearing, SP accuracy class with C1 minimal radial clearance and standard TN polyamide cage. Series 10 narrow cross-section reduces dead weight and rolling friction for stable medium-high speed performance. Straight cylindrical bore achieves positioning via interference fit with simple assembly process. The ribless outer ring enables free axial floating, automatically absorbing shaft elongation induced by temperature rise and removing internal stress inside bearing.

This bearing is open type without built-in seals and internal oil passages, compatible with external oil-air or circulating oil lubrication systems. No independent re-lubrication channel; lubricant is guided via external housing structure. C1 minimal clearance is optimized for precision spindles to reduce rotary vibration and maintain stable machining accuracy.

Selection guide:

N1012 TN/SP (cylindrical bore TN cage, SP precision, C1 clearance, radial support for precision spindles)

N1012 TN (normal precision for general medium-high speed rotary equipment)

N1012 KTN/SP (taper bore version, allows preload adjustment with lock nut)

N1012 TNHA/SP (heat-resistant cage for long continuous production)

N1012 TN/UP (ultra-precision machining requiring extreme rotational accuracy)

Recommended matching bearing: 7012 SP grade precision angular contact ball bearing to form complete spindle assembly undertaking axial loads.

3 Core Performance Advantages

1. Light Series 10 narrow cross-section minimizes friction loss, stably reaching maximum 12000 r/min under oil-air lubrication for medium-high speed precision spindles.

2. TN polyamide non-metallic cage ensures smooth rotation and low noise, delivering reliable long-term operation under stable temperature environment.

3. Standard straight cylindrical bore features simple assembly, realizing precise radial positioning through proper interference fit.

4. SP precision standard combined with C1 minimal radial clearance tightly controls rotational runout, alleviates high-speed vibration and stabilizes workpiece surface quality.

5. Axially floatable outer ring compensates spindle thermal elongation, avoids stress concentration from temperature variation and slows bearing fatigue.

6. Constructed from premium bearing steel with stable contact condition between raceways and rollers, sufficient load rating balances carrying capacity and high-speed operation.

4 Typical Application Fields

4.1 Precision CNC lathe and sliding head machine spindles

Finishing spindles of medium precision CNC lathes running stably at medium-high speed, equipped with external oil-air or grease lubrication

4.2 Internal, cylindrical and tool grinder spindle units

Precision grinding machines working continuously with strict requirements on spindle vibration, temperature rise and surface finish

4.3 High-speed engraving-milling machines and medium-sized machining center spindles

Light finishing cutting applications with obvious shaft thermal elongation requiring floating radial support bearings

4.4 Other high-end precision medium-high speed rotary components

Power rotary parts without on-site preload adjustment demand, requiring thermal elongation compensation and stable radial rotary accuracy

5 Assembly Specifications & Usage Guidelines

5.1 Assembly Environment & Operation Standards

SP precision bearings shall be assembled in constant-temperature dust-free clean workshops. Thoroughly remove contaminants on shaft journals, housing bores and spacers. Strictly control fit tolerances between shaft and housing. Hot mounting method is recommended for straight bore bearings; hitting bearing face directly is prohibited. C1 minimal clearance is highly sensitive to interference; excessive interference leads to excessive clearance reduction and overheating during operation. After assembly, conduct gradual speed-up no-load running-in from low speed and monitor temperature and vibration in real time. Reliable sealing structure must be installed to prevent dust and coolant from contacting rolling surfaces.

5.2 Selection Guidance

Medium-high speed finishing, obvious shaft thermal elongation, straight bore assembly, high precision demand → N1012 TN/SP

Medium-high speed operation, stable ambient temperature, cost control, medium precision requirement → N1012 TN

On-site preload adjustment required → choose tapered bore model N1012 KTN/SP

Long continuous running, high operating temperature → select TNHA high-temperature cage variant

Ultra-precision mirror machining, top-tier rotational accuracy target → N1012 TN/UP

Important notice: Floating outer ring cannot withstand axial loads; combination with precision angular contact ball bearings is mandatory.

5.3 Lubrication Maintenance Instruction

No lubricant pre-filled at factory. Oil-air lubrication is preferred to achieve maximum rotational speed; high-speed grease can be replenished periodically for medium-low speed conditions. Continuously monitor bearing temperature and avoid prolonged over-temperature operation. Inspect sealing integrity regularly to block hard contaminants entering raceways. Lubrication interruption will cause premature wear of rollers and cage.

5.4 Environmental Application Notes

Open construction without built-in seals; labyrinth seals or oil seals are compulsory. Raceways and rollers are sensitive to tiny hard particles; contaminants will increase vibration and rapidly degrade machining precision. Continuous shock loads should be avoided to prevent indentations on rolling contact surfaces. Make full use of outer ring floating characteristic to release thermal stress; do not forcibly restrict outer ring axial displacement.

6 Fault Identification

Common failure modes: continuously rising vibration at high speed, regular texture marks on machined workpieces, abnormal spindle temperature increase, periodic rotation noise, cage abrasion, roller edge scuffing and raceway fatigue spalling. Shut down equipment immediately once persistent abnormal noise or irreversible accuracy loss occurs. Bearings with permanent damage on raceways, rollers or cages cannot be repaired and need full replacement.