Product Overview

The NMT 7014 ACE/HCP4ALDGA is a pre-assembled duplex universally matchable super-precision hybrid ceramic 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 silicon nitride (Si₃N₄) hybrid ceramic rolling elements (HC) 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 (36.4 kN) and a static load rating of 7,762 lbf (34.5 kN) . The LDGA 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 hybrid ceramic technology 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 1.11 kg with an operating temperature range of -30°C to 110°C.

 

Model Code Decoding – Understanding NMT 7014 ACE/HCP4ALDGA

Code Meaning

7014 Basic series designation, 70 mm bore, 110 mm OD, 40 mm total width

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

HC Hybrid ceramic – rolling elements made of bearing-grade silicon nitride (Si₃N₄) 

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

LDGA Duplex General Arrangement + Light preload design – 2-bearing matched set with universal matchable (SU) capability, factory-preset Class A extra light preload, featuring lightweight phenolic cage

Core Value: LDGA universal matchability (SU) means every NMT 7014 ACE/HCP4ALDGA 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. HC hybrid ceramic technology drastically reduces centrifugal forces and frictional heat at high speeds. P4A super-precision ensures bore and OD tolerances are controlled within -0.004 mm to 0 – these four elements work together to make this bearing set a high-performance yet flexible general-purpose precision bearing solution.

 

Core Performance Advantages

1. Hybrid Ceramic Technology – A Leap in Ultra-High-Speed Performance

Silicon nitride (Si₃N₄) ceramic balls have only 60% the density of bearing steel, significantly reducing centrifugal forces and operating temperatures at high speeds. Ceramic materials also offer lower thermal expansion coefficients and higher elastic modulus, effectively suppressing geometric deformation at high speeds while providing electrical insulation and longer service life. Combined with chrome steel rings, this achieves the perfect balance of high rigidity, high speed, and durability.

 

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 ceramic balls per bearing – offering higher speed capability and the ability to accommodate heavier loads than equivalent B-type high-speed bearings. Combined with hybrid ceramic rolling elements and a phenolic resin cage, the set achieves a limiting speed of 29,000 r/min.

 

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

LDGA 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

 

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 29,000 r/min limiting speeds.

 

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

 

7. Steel Rings + Ceramic Balls – High Rigidity, High Speed, Cost-Effectiveness

Premium chrome steel rings combined with silicon nitride ceramic balls deliver the high rigidity and impact resistance of all-steel bearings along with the high-speed low-heat characteristics of hybrid ceramic technology.

 

8. 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 (36.4 kN)

Static Radial Load 7,762 lbf (34.5 kN)

Ball Diameter Dw 9.525 mm

Ceramic Balls per Bearing 25

Limiting Speed 29,000 r/min

Ball Material Silicon Nitride (Si₃N₄)

Ring Material Chrome Steel

Cage Material Phenolic Resin

Seal Type Open

Tolerance Class P4A

Preload Class A (Extra Light)

Arrangement Universal Matchable (SU)

Bearings in Set 2

Weight 1.11 kg

Temperature Range -30°C to 110°C

Typical Applications

The NMT 7014 ACE/HCP4ALDGA, with its hybrid ceramic ultra-high-speed performance, E-type high-speed design, 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

 

Important Installation Notes

✅ This bearing set is universally matchable (LDGA) – any two sets of the same model can be directly paired. Configurable as back-to-back (<>), face-to-face (><), or tandem (>>) arrangements.

 

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

 

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

 

⚠️ 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).

 

⚠️ Hybrid ceramic bearings are more sensitive to installation shock. Heat mounting or hydraulic installation methods are recommended – avoid impact on raceways or rolling elements.

 

⚠️ 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 7014 ACE/HCP4ALDGA bearing set – from ring material (high-purity chrome steel), ceramic balls (HIP silicon nitride), 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 25° contact angle (ACE type), E-type high-speed design, hybrid ceramic technology (HC), P4A precision, Class A extra light preload, and universal matchable flexibility makes this bearing set the flagship general-purpose precision bearing solution in the NMT 7014 series – offering the perfect balance of high performance and flexible arrangement.

 

Choose NMT 7014 ACE/HCP4ALDGA for:

 

✅ Hybrid ceramic technology – 29,000 r/min ultra-high-speed performance

 

✅ 25° contact angle + E-type high-speed design – 8,190 lbf (36.4 kN) high load capacity

 

✅ 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

 

✅ Lightweight phenolic resin cage – low friction, high speed

 

✅ Steel rings + ceramic balls – high rigidity, high speed, cost-effectiveness

 

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