Product Overview

The NMT 7010 ACEGB/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 B medium preload (GB) . 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 (3,330 lbf)  and a static load rating of 10.0 kN (2,250 lbf) . The GB 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 B medium preload, the bearing achieves a limiting speed of 46,000 r/min.

 

Model Code Decoding – Understanding NMT 7010 ACEGB/P4A

Code Meaning

7010 Basic series designation, 50 mm bore, 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 – higher speed capability and heavier load capacity than equivalent B-type high-speed bearings

G Single bearing (not a pre-assembled set)

B Class B medium preload – ideal for high-speed heavy-load applications

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

Core Value: GB universal matchability means every 7010 ACEGB/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 and load 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 and Heavy Load Combined

The E-type high-speed design optimizes internal geometry and rolling element parameters, significantly reducing sliding friction and churning losses at high speeds. Compared to equivalent B-type high-speed bearings, the E-type design offers higher speed capability and can accommodate heavier loads. Combined with a lightweight phenolic resin cage, the bearing achieves a limiting speed of 46,000 r/min.

 

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

GB 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 (3,330 lbf) dynamic and 10.0 kN (2,250 lbf) static load rating. The bearing weighs only 0.25 kg.

 

4. Class B Medium Preload – Ideal for High-Speed Heavy-Load Applications

Class B medium preload provides "just-right" internal contact stiffness for high-speed spindles – eliminating internal clearance, reducing vibration and noise at high speeds, while providing higher system rigidity than Class A extra light preload, making it particularly suitable for heavy-load high-speed applications requiring greater stiffness. 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

Speed (Grease) 22,000 – 23,000 r/min

Speed (Oil) 34,000 r/min

Ball Material Chrome Steel

Ring Material Chrome Steel

Cage Material Phenolic

Seal Type Open

Tolerance Class P4A

Preload Class B (Medium)

Arrangement Universal Matchable (SU)

Weight 0.25 kg

Temperature Range -30°C to 110°C

Typical Applications

The NMT 7010 ACEGB/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

 

High-Frequency Motors – high-speed, high-precision motor applications

 

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 (GB) – 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 B medium 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.

 

⚠️ Grease lubrication limits speed to approximately 22,000 – 23,000 r/min, oil lubrication to approximately 34,000 r/min.

 

NMT Quality Commitment

Japan NMT (Enmutī) applies strict Japanese quality standards to every 7010 ACEGB/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 B medium 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 ACEGB/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 B medium preload – ideal for high-speed heavy-load applications

 

✅ P4A super-precision running accuracy

 

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