Product Overview

The NMT 7010 ACEGA/P4A is an open, universally matchable single-row super-precision angular contact ball bearing. With a 50 mm bore, 80 mm outer diameter, and 16 mm width, this bearing features a 25° contact angle (AC type) and high-speed E-type design, with all-steel rolling elements and a lightweight phenolic resin cage, factory-preset with Class A extra light preload (GA) . It integrates ultra-high-speed performance, high load capacity, and flexible arrangement capability into a single package, accommodating radial and unidirectional axial loads simultaneously.

 

The bearing offers a basic dynamic load rating of 14.8 kN and a static load rating of 10.0 kN. The GA universal matchable suffix indicates that this bearing features universal matchable (SU) capability – any two bearings of the same model can be directly paired without selective shimming or additional grinding. Users can freely configure them in back-to-back (<>), face-to-face (><), or tandem (>>) arrangements. Manufactured to P4A super-precision tolerance class with Class A extra light preload, the bearing achieves a limiting speed of 46,000 r/min.

 

Model Code Decoding – Understanding NMT 7010 ACEGA/P4A

Code Meaning

7010 Basic series designation, 50 mm bore (10×5 mm), 80 mm OD

AC Angular contact design with 25° contact angle – delivers superior axial rigidity and radial load capacity

E High-speed E-type design – optimized internal geometry for higher speed capability and lower friction

G Single bearing (not a pre-assembled set)

A Class A extra light preload – ideal for high-speed precision applications

P4A Super-precision tolerance class – dimensional accuracy to ISO P4 class (ABEC 7), running accuracy superior to P4

Core Value: GA universal matchability means every 7010 ACEGA/P4A bearing's end-face height difference and parallelism are tightly controlled, allowing any two bearings of the same model to be directly paired without selection or re-grinding. The E-type high-speed design delivers superior speed capability. P4A super-precision ensures bore and OD tolerances are controlled within -0.004mm to 0 – these three elements work together to make this bearing a high-performance yet flexible general-purpose precision bearing.

 

Core Performance Advantages

1. High-Speed E-Type Design – Ultra-High-Speed Performance

The E-type high-speed design optimizes internal geometry and rolling element parameters, significantly reducing sliding friction and churning losses at high speeds. Combined with a lightweight phenolic resin cage, the bearing achieves a limiting speed of 46,000 r/min.

 

2. Universal Matchable (GA) – One Inventory, Infinite Arrangements

GA universal matchability delivers outstanding value:

 

Simplified inventory: Stock a single model to cover DB, DF, and DT pairing needs

 

On-site flexibility: Change arrangements during commissioning based on actual load directions

 

Easy maintenance: Replace individual bearings without replacing entire matched sets

 

No shims required: Install directly to achieve design preload

 

3. 25° Contact Angle + All-Steel Construction – Powerful Combined Load Capacity

The 25° contact angle delivers superior axial rigidity while maintaining ample radial capacity. With a ball diameter of 7.938 mm and 21 balls per bearing, it achieves an outstanding 14.8 kN dynamic and 10.0 kN static load rating. The bearing weighs only 0.25 – 0.26 kg.

 

4. Class A Extra Light Preload – Ideal for High-Speed Precision Applications

Class A extra light preload provides "just-right" internal contact stiffness for high-speed spindles – eliminating internal clearance, reducing vibration and noise at high speeds, while avoiding excessive temperature rise from over-preloading. This ensures stable temperature performance even at 46,000 r/min limiting speeds.

 

5. P4A Super-Precision Grade – Micron-Level Accuracy

The P4A tolerance class guarantees minimal radial runout and axial play. Bore and outside diameter tolerances are -0.004mm to 0, meeting stringent surface quality and dimensional consistency requirements. Operating temperature range is -30°C to 110°C.

 

6. Lightweight Phenolic Resin Cage

The lightweight high-strength phenolic resin cage provides excellent guidance accuracy and low friction at high speeds, contributing to reduced centrifugal forces, friction, and heat generation – a key factor in achieving the 46,000 r/min limiting speed.

 

7. Clear Performance Specifications

 

Parameter Value

Bore d 50 mm

Outer Diameter D 80 mm

Width B 16 mm

Contact Angle 25°

Dynamic Load Rating C 14.8 kN (3,330 lbf)

Static Load Rating C₀ 10.0 kN (2,250 lbf)

Ball Diameter Dw 7.938 mm

Balls per Bearing 21

Limiting Speed 46,000 r/min

Ball Material Chrome Steel

Ring Material Chrome Steel

Cage Material Phenolic

Seal Type Open

Tolerance Class P4A

Preload Class A (Extra Light)

Arrangement Universal Matchable (SU)

Weight 0.25 – 0.26 kg

Temperature Range -30°C to 110°C

Typical Applications

The NMT 7010 ACEGA/P4A, with its high-speed performance and universal matchable flexibility, covers an exceptionally wide range of high-end applications:

 

High-Speed Machine Tool Spindles – CNC machine tools, precision grinders, milling center spindles

 

High-Speed Electric Spindles – PCB drilling, micro-machining, engraving/milling

 

Machining Center Spindles – vertical/horizontal spindle systems

 

Precision Rotary Tables and Indexing Devices – high-accuracy rotary positioning

 

Industrial Robots – high-precision transmission mechanisms and rotary axes

 

Aerospace Components – gyroscopes, actuators, jet engine parts

 

Medical Equipment – high-speed dental drills and medical imaging devices

 

Semiconductor Manufacturing Equipment – precision wafer processing spindles

 

Important Installation Notes

✅ This bearing is universally matchable (GA) – any two bearings of the same model can be directly paired.

 

✅ This bearing is open design – select appropriate lubrication method based on application. To achieve the 46,000 r/min limiting speed, oil-air or oil-mist lubrication is recommended.

 

✅ For paired installations, using bearings from the same production batch is recommended for optimal consistency.

 

⚠️ This bearing comes with factory-preset Class A extra light preload. No additional preload adjustment is required during installation. However, ensure shaft and housing fits comply with P4A grade requirements (bore/OD tolerance -0.004mm to 0).

 

⚠️ Ensure the contact angle direction matches the intended load direction – incorrect orientation will eliminate load capacity.

 

NMT Quality Commitment

Japan NMT (Enmutī) applies strict Japanese quality standards to every 7010 ACEGA/P4A bearing – from ring material (high-purity chrome steel) and rolling elements to superfinishing processes. End-face height difference, parallelism, and contact angle deviation of each bearing are tightly controlled to ensure universal matchability consistency across any two bearings of the same model. The combination of E-type high-speed design, P4A precision, 25° contact angle, and Class A extra light preload makes this bearing the flagship general-purpose precision bearing in the NMT 7010 series – offering the perfect balance of high performance and flexible arrangement.

 

Choose NMT 7010 ACEGA/P4A for:

 

✅ E-type high-speed design – 46,000 r/min ultra-high-speed performance

 

✅ Universal matchable – one inventory, infinite arrangements

 

✅ 25° contact angle – powerful combined load capacity

 

✅ Class A extra light preload – ideal for high-speed precision applications

 

✅ P4A super-precision running accuracy

 

✅ All-steel – high rigidity, impact resistance, cost-effectiveness