Product Overview

The NMT 7014 ACE/P4ADGA is a pre-assembled duplex universally matchable super-precision angular contact ball bearing set, comprising 2 rows of bearings precision-paired in a universal matchable (SU) configuration. With a total width of 40 mm (20 mm per row × 2), a 70 mm bore, and a 110 mm outer diameter, this set features a 25° contact angle (ACE type) and high-speed E-type design, combined with all-steel rolling elements and a 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 set offers a radial dynamic load rating of 8,190 lbf (36.45 kN)  and a static load rating of 7,762 lbf (34.5 – 34.6 kN) . The DGA universal matchable suffix indicates that this set features universal matchable (SU) capability – any two sets 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 the P4A super-precision tolerance class with E-type high-speed design and Class A extra light preload, the set achieves a limiting speed of 29,000 r/min. The bore and outside diameter tolerances are controlled within -0.004 mm to 0. The set weighs 1.22 kg with an operating temperature range of -30°C to 110°C.

 

Model Code Decoding – Understanding NMT 7014 ACE/P4ADGA

Code Meaning

7014 Basic series designation, 70 mm bore, 110 mm OD

ACE 25° contact angle + High-speed E-type design – 25° contact angle provides superior axial rigidity and radial load capacity; E-type offers higher speed capability and can accommodate heavier loads than equivalent B-type high-speed bearings

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

DGA Duplex General Arrangement + Class A preload – 2-bearing matched set with universal matchable (SU) capability, factory-preset Class A extra light preload

Core Value: DGA universal matchability (SU) means every NMT 7014 ACE/P4ADGA 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 ACE-type 25° contact angle + E-type high-speed design balances high speed and high load capacity. P4A super-precision ensures bore and OD tolerances are controlled within -0.004 mm to 0 – these three elements work together to make this bearing set a high-performance yet flexible flagship precision bearing solution.

 

Core Performance Advantages

1. Duplex Universal Matchable Set – Doubled System Rigidity and Load Capacity

This bearing set comprises 2 rows of bearings precision-matched into one unit, delivering double the load capacity and system rigidity. The universal matchable (SU) feature allows flexible configuration in back-to-back (<>), face-to-face (><), or tandem (>>) arrangements. Both bearings undergo factory end-face matching grinding, ensuring uniform load distribution across both rows, preventing individual bearing overload, and significantly extending overall set service life. Dynamic load rating 8,190 lbf (36.45 kN) , static load rating 7,762 lbf (34.5 kN) .

 

2. 25° Contact Angle (ACE Type) + High-Speed E-Type Design – Ultra-High Speed and Heavy Load Combined

The 25° contact angle delivers superior axial rigidity while maintaining ample radial capacity. The E-type high-speed design optimizes internal geometry and rolling element parameters – ball diameter 9.525 mm, 25 balls per bearing – offering higher speed capability and the ability to accommodate heavier loads than equivalent B-type high-speed bearings. Combined with a phenolic resin cage, the set achieves a limiting speed of 29,000 r/min.

 

3. Universal Matchable (DGA) – One Inventory, Infinite Arrangements

DGA 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

 

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 the 29,000 r/min limiting speed.

 

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

The P4A tolerance class (surpassing ABEC 7) guarantees minimal radial runout and axial play. Bore and outside diameter tolerances are -0.004 mm to 0. Both bearings undergo factory precision end-face matching grinding, ensuring highly uniform load distribution across both rows. 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 29,000 r/min limiting speed.

 

7. 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.

 

8. Open Design – Flexible Lubrication Options

This set features an open design, allowing flexible selection of lubrication methods based on application requirements, and facilitating easy maintenance and relubrication.

 

9. Clear Performance Specifications

 

Parameter Value

Bore d 70 mm

Outer Diameter D 110 mm

Total Width B 40 mm (2×20 mm)

Contact Angle 25°

Dynamic Radial Load 8,190 lbf (36.45 kN)

Static Radial Load 7,762 lbf (34.5 – 34.6 kN)

Ball Diameter Dw 9.525 mm

Balls per Bearing 25

Limiting Speed 29,000 r/min

Ball Material Chrome Steel

Ring Material Chrome Steel

Cage Material Phenolic Resin

Seal Type Open

Tolerance Class P4A (ABEC 7)

Preload Class A (Extra Light)

Arrangement Universal Matchable (SU)

Bearings in Set 2

Weight 1.22 kg

Temperature Range -30°C to 110°C

Typical Applications

The NMT 7014 ACE/P4ADGA, with its duplex universal matchable rigidity, E-type high-speed design, and P4A super-precision grade, 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

 

Important Installation Notes

⚠️ This is a duplex fixed matched set – the 2 bearings are supplied as one complete unit. Do not separate or mix with other bearings of the same model.

 

✅ This set features universal matchable (SU) capability – freely configurable as back-to-back (<>), face-to-face (><), or tandem (>>) arrangements.

 

✅ This set is open design – select appropriate lubrication method based on application. To achieve the 29,000 r/min limiting speed, oil-air or oil-mist lubrication is recommended.

 

⚠️ This set 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 -0.004 mm to 0).

 

✅ This set comes pre-lubricated from the factory – ready to install out of the box.

 

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

 

NMT Quality Commitment

Japan NMT (Enmutī) applies the most stringent end-face matching grinding and preload control to every DGA duplex bearing set. Both bearings undergo complete factory matching and full-parameter inspection, ensuring load-sharing deviation between rows is minimized to an extremely small range. The 7014 ACE/P4ADGA delivers P4A accuracy, 25° contact angle, E-type high-speed design, Class A extra light preload, and universal matchable flexibility for unparalleled rotational support in your premier high-speed spindles.

 

Choose NMT 7014 ACE/P4ADGA for:

 

✅ Duplex universal matchable set – doubled system rigidity and load capacity

 

✅ 25° contact angle + E-type high-speed design – 29,000 r/min ultra-high speed and 8,190 lbf high load combined

 

✅ Universal matchable – one inventory, infinite arrangements

 

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

 

✅ P4A super-precision running accuracy – bore/OD tolerance -0.004 mm to 0

 

✅ Phenolic resin cage – low friction, low noise, high speed

 

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

 

✅ Factory pre-matched and pre-lubricated – ready to install