Product Overview

The NMT 7013 ACEGB/P4A is an open, universally matchable single-row super-precision angular contact ball bearing. With a 65 mm bore, 100 mm outer diameter, and 18 mm width, this bearing features a 25° contact angle (AC type) and high-speed E-type design, combined with all-steel rolling elements and a lightweight phenolic resin cage, factory-preset with Class B light preload (GB) . It integrates ultra-precision rotational accuracy, high load capacity, excellent high-speed performance, and universal matchable flexibility into a single package, accommodating radial and unidirectional axial loads simultaneously.

 

The bearing offers a radial dynamic load rating of 4,388 lbf (19.5 kN) and a static load rating of 3,285 lbf (14.6 kN) . Manufactured to the P4A super-precision tolerance class with bore and OD tolerances controlled within -0.004 mm to 0, the bearing achieves a limiting speed of 17,000 r/min under grease lubrication and 31,000 r/min under oil lubrication. The bearing weighs 0.43 – 0.44 kg with an operating temperature range of -30°C to 110°C.

 

Model Code Decoding – Understanding NMT 7013 ACEGB/P4A

Code Meaning

7013 Basic series designation, 65 mm bore, 100 mm OD, 18 mm width

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 with 25 balls of 8.731 mm diameter, delivering higher speed capability and higher load capacity

G Single bearing (not a pre-assembled set)

B Class B light preload – eliminates internal clearance, enhances system rigidity for high-speed precision applications

P4A Super-precision tolerance class – superior to ABEC 7, bore and OD tolerances -0.004 mm to 0

Core Value: GB universal matchability (SU) means every NMT 7013 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 selective shimming or additional grinding. The AC-type 25° contact angle delivers superior axial rigidity while maintaining ample radial capacity. The E-type high-speed design, with optimized rolling element parameters (25 balls of 8.731 mm diameter), achieves outstanding load and speed performance. Class B light preload eliminates internal clearance, reducing vibration and noise at high speeds while avoiding excessive temperature rise from over-preloading. P4A super-precision ensures bore and OD tolerances are controlled within -0.004 mm to 0 – these five elements work together to make this bearing a high-performance yet flexible flagship general-purpose precision bearing.

 

Core Performance Advantages

1. High-Speed E-Type Design – Ultra-High Speed and High Load Combined

The E-type high-speed design optimizes internal geometry and rolling element parameters, featuring 25 balls of 8.731 mm diameter. It delivers a dynamic load rating of 4,388 lbf (19.5 kN) and static load rating of 3,285 lbf (14.6 kN) , with a limiting speed of 31,000 r/min under oil lubrication.

 

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, providing effective load sharing within a predetermined preload range

 

3. Class B Light Preload – Ideal for High-Speed Precision Applications

Class B 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, ensuring stable performance even at 31,000 r/min.

 

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

The P4A tolerance class (superior to ABEC 7) guarantees minimal radial runout and axial play. Bore and outside diameter tolerances are -0.004 mm to 0, meeting stringent surface quality and dimensional consistency requirements.

 

5. 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 31,000 r/min limiting speed.

 

6. All-Steel Construction – High Rigidity, Impact Resistance, Cost-Effectiveness

Premium chrome steel rings and balls offer higher fracture toughness and impact resistance – more reliable under interrupted cutting and accidental overload conditions. All-steel bearings also offer significant cost advantages for high-volume industrial applications.

 

7. Clear Performance Specifications

 

Parameter Value

Bore d 65 mm

Outer Diameter D 100 mm

Width B 18 mm

Contact Angle 25°

Dynamic Radial Load 4,388 lbf (19.5 kN)

Static Radial Load 3,285 lbf (14.6 kN)

Ball Diameter Dw 8.731 mm

Balls per Bearing 25

Speed (Grease) 17,000 r/min

Speed (Oil) 31,000 r/min

Ball Material Chrome Steel

Ring Material Chrome Steel

Cage Material Phenolic

Seal Type Open

Tolerance Class P4A

Preload Class B (Light)

Arrangement Universal Matchable (SU)

Weight 0.43 – 0.44 kg

Temperature Range -30°C to 110°C

Typical Applications

The NMT 7013 ACEGB/P4A, with its high load capacity, ultra-precision, excellent 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 – high-speed rotary units

 

Machining Center Spindles – vertical/horizontal spindle systems

 

Precision Rotary Tables – high-accuracy rotary positioning

 

Aerospace Components – gyroscopes, actuators, jet engine parts

 

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

 

Semiconductor Manufacturing Equipment – precision wafer processing spindles

 

Industrial Robots – high-precision transmission mechanisms and rotary axes

 

Electric Vehicle Motor Shafts – high-speed, high-precision motor applications

 

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 31,000 r/min oil lubrication limiting speed, oil-air or oil-mist lubrication is recommended; grease lubrication limits speed to 17,000 r/min.

 

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

 

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

 

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

 

 

⚠️ A single-row angular contact ball bearing can accommodate axial load in one direction only. Paired installations (DB/DF/DT) are required for bidirectional axial load capacity.