Product Overview

The NMT 7014 ACB/HCP4ATGA is a pre-assembled triplex universally matchable super-precision hybrid ceramic angular contact ball bearing set, comprising 3 rows of bearings precision-paired in a universal matchable (SU) configuration. With a total width of 60 mm (20 mm per row × 3), a 70 mm bore, and a 110 mm outer diameter, this set features a 25° contact angle (ACB type) , combined with silicon nitride (Si₃N₄) hybrid ceramic rolling elements (HC) and a phenolic resin cage (TGA) , factory-preset with Class A extra light preload (GA) , delivering ultimate system rigidity, ultra-high-speed performance, high load capacity, and flexible arrangement capability.

 

The bearing set offers a radial dynamic load rating of 8,775 lbf (39 kN) and a static load rating of 10,462 lbf (46.5 kN) . The TGA universal matchable suffix indicates that this set consists of 3 fully matched bearings with universal matchable (SU) capability – any three sets of the same model can be directly paired, providing effective load sharing within a predetermined preload range. 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 36,000 r/min. The set weighs 1.88 kg with an operating temperature range of -30°C to 110°C.

 

Model Code Decoding – Understanding NMT 7014 ACB/HCP4ATGA

Code Meaning

7014 Basic series designation, 70 mm bore (14×5 mm)

ACB Angular contact design with 25° contact angle

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

P4A Super-precision tolerance class – surpassing ABEC 7/ISO P4 standards

TGA Phenolic resin cage – lightweight, high strength with excellent sliding properties and high-speed adaptability

Core Value: TGA universal matchability (SU) means every NMT 7014 ACB/HCP4ATGA bearing's end-face height difference and parallelism are tightly controlled, allowing any three bearings of the same model to be directly paired without selection or re-grinding. The ACB-type 25° contact angle delivers superior axial rigidity and radial load capacity. HC hybrid ceramic technology drastically reduces centrifugal forces and frictional heat at high speeds. The TGA phenolic resin cage provides excellent guidance accuracy and low friction at high speeds. 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 set the flagship precision bearing solution offering the perfect balance of ultimate rigidity, ultra-high-speed performance, and flexible arrangement.

 

Core Performance Advantages

1. Triplex Universal Matchable Set – Ultimate System Rigidity and Uniform Load Distribution

This bearing set comprises 3 rows of bearings in one matched unit, delivering triple the load capacity and system rigidity. The universal matchable (SU) feature allows flexible configuration in back-to-back (<>), face-to-face (><), or tandem (>>) arrangements. All 3 bearings undergo factory end-face matching grinding, with bore and OD matching precision controlled within tolerance limits, ensuring highly uniform load distribution across all 3 rows, preventing individual bearing overload, and significantly extending overall set service life. Radial dynamic load rating 8,775 lbf (39 kN) , static load rating 10,462 lbf (46.5 kN) .

 

2. 25° Contact Angle (ACB Type) – 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 28 ceramic balls per bearing, it achieves outstanding combined load capacity. Capable of accommodating heavy loads at relatively high speeds.

 

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

Silicon nitride (Si₃N₄) ceramic balls have only 60% the density of bearing steel, drastically reducing centrifugal forces and frictional heat at high speeds. Ceramic materials also offer lower thermal expansion coefficients and higher elastic modulus, effectively suppressing geometric deformation at high speeds while improving seizure resistance and lubrication-starvation tolerance, significantly extending maintenance intervals.

 

4. TGA Phenolic Resin Cage – Speed and Durability Combined

The TGA phenolic resin cage is lightweight and high-strength, featuring excellent sliding properties and high-speed adaptability. It 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 36,000 r/min limiting speed.

 

5. Class A Extra Light Preload – Precision Stiffness at Speed Limits

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 36,000 r/min limiting speeds.

 

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

The P4A tolerance class (surpassing ABEC 7/ISO P4 standards) guarantees minimal radial runout and axial play. Bore and outside diameter tolerances are -0.004 mm to 0. All 3 bearings undergo factory precision end-face matching grinding, ensuring highly uniform load distribution across all rows. Operating temperature range is -30°C to 110°C.

 

7. 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.

 

8. Clear Performance Specifications

 

Parameter Value

Bore d 70 mm

Outer Diameter D 110 mm

Total Width B 60 mm (3×20 mm)

Contact Angle 25°

Dynamic Radial Load 8,775 lbf (39 kN)

Static Radial Load 10,462 lbf (46.5 kN)

Ball Diameter Dw 7.938 mm

Ceramic Balls per Bearing 28

Limiting Speed 36,000 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 3

Weight 1.88 kg

Temperature Range -30°C to 110°C

Typical Applications

The NMT 7014 ACB/HCP4ATGA, with its triplex universal matchable ultimate rigidity, hybrid ceramic ultra-high-speed performance, 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 triplex fixed matched set – the 3 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 36,000 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).

 

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

 

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

 

NMT Quality Commitment

Japan NMT (Enmutī) applies the most stringent end-face matching grinding and preload control to every TGA triplex bearing set. All 3 bearings undergo complete factory matching and full-parameter inspection, ensuring load-sharing deviation between rows is minimized to an extremely small range. The 7014 ACB/HCP4ATGA delivers P4A accuracy, 25° contact angle high rigidity, hybrid ceramic technology, TGA phenolic resin cage, and triplex universal matchable ultimate rigidity for unparalleled rotational support in your premier high-speed spindles.

 

Choose NMT 7014 ACB/HCP4ATGA for:

 

✅ Triplex universal matchable set – ultimate system rigidity and bidirectional load capacity

 

✅ 25° contact angle – powerful combined load capacity

 

✅ Hybrid ceramic technology – 36,000 r/min ultra-high-speed performance

 

✅ TGA phenolic resin cage – speed and durability combined

 

✅ Class A extra light preload – precision stiffness at speed limits

 

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

 

✅ Open design – flexible lubrication options

 

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