1 Complete Model & Code Explanation

Model: 7001 ACEGB/HCP4A

Code Definition

7001: Basic dimension specification of 70 light series single-row angular contact ball bearing

ACE: Standard raceway geometry with 25° nominal contact angle, balancing limiting speed and axial load capacity, suitable for combined loads dominated by radial force

GB: Double non-contact dust seal. No physical contact friction to support high-speed operation, offering basic dry dust protection only, not resistant to mist or liquid splash

HCP4A: Advanced ultra-precision P4 tolerance grade with optimized rotational runout for premium high-speed spindles. Single unit supports on-site DB/DF/DT free duplex assembly

Supply form: Separate single bearing without factory duplex lapping. Precision spacers are required for preload adjustment during paired assembly.

Important reminder: 7001 ACEGB/HCP4A adopts bearing steel without anti-rust property, prone to rust under humid conditions; dry housing protection is mandatory. GB non-contact dust seal provides no water resistance, continuous coolant or mist penetration must be avoided. Limiting speed is remarkably higher than GA contact seal versions. No grease pre-filled, compatible with grease, oil-air and circulating oil lubrication. Bearing steel delivers higher load capacity than equivalent S-series stainless steel bearings.

Basic Parameters

Bore d: 12 mm

Outer diameter D: 28 mm

Width B: 8 mm

Nominal contact angle: 25°

Structure: Single-row angular contact ball bearing, supplied as single unit

Internal geometry: ACE raceway with 25° contact angle

Contact type: Two-point contact

Number of rows: Single row

Ring construction: Integrated inner ring, integrated outer ring

Seal arrangement: GB double non-contact dust seal

Base material: High-purity bearing steel

Surface coating: Uncoated

Pre-installed lubricant: No pre-filled grease

Duplex capability: Universal matchable single bearing, supporting DB back-to-back / DF face-to-face / DT tandem layout; preload adjusted on site

Precision class: HCP4A (advanced ultra-precision P4 grade)

Basic dynamic load rating: 3.78 kN

Basic static load rating: 1.81 kN

Speed reference: Contact manufacturer for attainable rotational speed data

Net weight: 0.0172 kg

Indicative carbon footprint: 0.043 kg CO₂e

eClass code: 23-05-08-04

UNSPSC code: 31171531

Suffix Comparison within Series

7001 ACEGB/HCP4A: Bearing steel, 25° contact angle, double non-contact dust seal, no pre-filled grease, HCP4A high precision, duplex capable (this model)

7001 ACEGA/HCP4A: Bearing steel double contact rubber seal, improved mist protection with higher friction and lower limiting speed for mild liquid splash

7001 ACE/HCP4A: Open bearing steel bearing with maximum limiting speed for fully enclosed oil-air / circulating oil high-speed spindles

7001 CDGB/HCP4A: 30° contact angle non-contact sealed bearing with enhanced axial rigidity for heavy axial load applications

S7001 ACEGB/P4A: Martensitic stainless steel non-contact seal variant with rust resistance, slightly lower load capacity for alternating humid-dry environments

2 Structure & Operating Characteristics

Japan NMT 7001 ACEGB/HCP4A is built on proven 70 light series architecture. The ACE 25° contact angle raceway balances rotational speed and axial load capacity, making it a mainstream selection for compact high-speed precision spindles. Inner and outer rings are forged from premium high-purity bearing steel with strictly controlled non-metallic inclusions to extend fatigue service life. Raceways undergo mirror super-finishing to reduce rolling friction and suppress vibration and noise at high rotation.

Equipped with GB double non-contact metallic dust shields. Zero physical contact within sealing clearance eliminates extra frictional heat generation, delivering outstanding temperature control and unlocking the bearing’s full limiting speed potential. This seal only blocks dry dust; it cannot withstand vapor or coolant splash and is not suitable for wet machining. No grease is pre-filled at factory, supporting flexible lubrication options including grease, oil-air and circulating oil systems.

Bearings are delivered as single units without factory duplex grinding. Machine builders can configure back-to-back, face-to-face or tandem arrangements with precision spacers according to spindle rigidity requirements. It is critical to distinguish dry and wet operating conditions during selection; dry chamber equipment or stainless steel variants are required for humid environments.

3 Core Performance Advantages

1. High-purity bearing steel substrate: Superior resistance to contact fatigue, stable service life under continuous high-speed operation.

2. ACE 25° contact angle geometry: Balances limiting speed and axial load capacity for combined loads dominated by radial force.

3. GB double non-contact dust seal: Negligible contact friction, low temperature rise at high speed to achieve higher maximum rotational speed.

4. HCP4A advanced ultra-precision grade: Optimized rotational runout to satisfy high-precision positioning demands of premium compact CNC spindles.

5. Flexible lubrication compatibility: No pre-charged grease, adaptable to grease, oil-air and circulating oil lubrication systems.

6. Versatile duplex assembly: Single bearing supports DB/DF/DT layouts to meet diversified spindle rigidity design targets.

5 Assembly Specifications & Usage Guidelines

5.1 Assembly Environment & Operation Standards

Assembly of HCP4A high-grade precision angular contact bearings must be carried out in constant-temperature dust-free clean workshops. Thermal mounting is preferred; direct impact on rings, rolling elements and dust shields is strictly prohibited. Dust protection must be maintained throughout assembly. Fine hard particles entering sealing clearance will cause persistent pitting corrosion on raceways. When paired, select precision spacers of matching accuracy and adjust target preload via load measurement to achieve balanced load sharing, avoiding high-speed resonance and local overheating.

5.2 Duplex Layout & Selection Guidance

Supply condition: Independent single non-contact dust sealed bearing

Available assembly layout: DB back-to-back / DF face-to-face / DT tandem

Selection reference:

Dry dust-free environment, priority on maximum speed, basic dust protection required → 7001 ACEGB/HCP4A (this model);

Coolant mist or mild liquid splash exists, enhanced sealing protection needed → 7001 ACEGA/HCP4A contact seal version;

Fully enclosed premium spindle with forced oil-air lubrication, pursuing ultimate speed → 7001 ACE/HCP4A open bearing;

Heavy axial thrust load, enhanced axial rigidity prioritized → 7001 CDGB/HCP4A;

Workshop with high humidity and condensation risk, anti-rust required → S7001 ACEGB/P4A stainless steel bearing.

5.3 Lubrication Scheme

No lubricant is pre-installed inside 7001 ACEGB/HCP4A. Suitable lubricating medium must be filled during assembly. Long-service high-speed bearing grease can be adopted for low-speed intermittent equipment; oil-air lubrication is recommended for medium-to-high speed continuous spindles; circulating dilute oil lubrication fits stable long-duration high-speed working conditions.

Monitor bearing temperature and vibration continuously, and set lubrication replenishment cycles based on operational load. Never mix lubricants of different grades or base oil types to prevent medium deterioration and premature bearing wear.

5.4 Environmental Application Notes

GB non-contact dust seal is only suitable for dry dusty environments. It provides no water resistance, cannot resist condensation or liquid splash. External housing sealing must be added where coolant, mist or condensate occurs during machining. Stainless steel bearings should be considered for permanently humid conditions. Bearing steel has no inherent rust resistance; maintain dry internal housing during equipment shutdown to prevent raceway corrosion. Not applicable for salt spray or chemically corrosive atmosphere.

6 Daily Maintenance & Fault Troubleshooting

Conduct low-speed staged running-in after assembly, then gradually raise rotational speed to rated value after stabilization, continuously tracking temperature rise and vibration spectrum. Abnormal overheating on non-contact sealed bearings generally originates from excessive preload, insufficient lubricant supply or foreign particle ingress.

Implement regular inspection schedules to monitor lubrication system status and avoid dry contact failure caused by interrupted oil supply. Shut down and inspect raceways and rolling elements once continuous abnormal noise or rising vibration occurs, checking for indentation, rust or spalling. Common failure triggers: loss of lubrication supply, abrasive wear from dust intrusion, idle rust in humid shutdown state, excessive contact stress induced by oversize preload.