Product Overview

The NMT 7014 CE/HCP4AL1DGA 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 15° contact angle (CE 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 L1 light preload. 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 8,775 lbf (39 kN) and a static load rating of 8,212 lbf (36.5 kN). The L1 light preload eliminates internal clearance, ensuring precise shaft positioning and minimal deflection. 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 hybrid ceramic technology and L1 light preload, the set achieves a limiting speed of 22,000 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 CE/HCP4AL1DGA

Code Meaning

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

CE 15° contact angle + High-speed E-type design – 15° contact angle balances high speed and high load capacity; E-type optimizes internal geometry for higher speed capability

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

P4A Super-precision tolerance class – dimensional accuracy to ISO P4 class, running accuracy superior to P4

L1 Light preload – provides optimized rigidity and positioning accuracy while minimizing high-speed friction and heat generation

DGA Duplex General Arrangement – 2-bearing matched set with universal matchable (SU) capability

Core Value: DGA universal matchability (SU) means every NMT 7014 CE/HCP4AL1DGA 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 CE-type 15° 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. L1 light preload eliminates internal clearance, ensuring precise shaft positioning and minimal deflection. 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 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, 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 bearing service life. Combined with chrome steel rings, this achieves the perfect balance of high rigidity, high speed, and durability.

 

2. 15° Contact Angle (CE Type) + High-Speed E-Type Design – Ultra-High Speed and Heavy Load Combined

The 15° small contact angle generates less frictional heat at equivalent speeds, offering higher limiting speed potential than 25° designs. The E-type high-speed design optimizes internal geometry and rolling element parameters – ball diameter 9.525 mm, 25 ceramic balls per bearing – significantly reducing sliding friction and churning losses at high speeds. Combined with hybrid ceramic rolling elements and a phenolic resin cage, the set achieves a limiting speed of 22,000 r/min.

 

3. L1 Light Preload – Ideal for High-Speed Precision Applications

L1 light preload provides precise internal contact stiffness for high-speed spindles – eliminating internal clearance, ensuring precise shaft positioning and minimal deflection, while avoiding excessive temperature rise from over-preloading. This ensures stable temperature performance even at 22,000 r/min limiting speeds.

 

4. 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

 

No shims required: Install directly to achieve design preload

 

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

The P4A tolerance class (dimensional accuracy to ISO P4 class, running accuracy superior to P4) guarantees minimal radial runout and axial play. Bore and outside diameter tolerances are -0.004 mm to 0. 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. This material offers an excellent strength-to-weight ratio, contributing to reduced centrifugal forces, friction, and heat generation – a key factor in achieving the 22,000 r/min limiting speed.

 

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. Open Design – Flexible Lubrication Options

This set features an open design (unsealed), allowing flexible selection of lubrication methods based on application – grease lubrication for general applications, oil-air lubrication for high-speed precision machining. The set comes pre-lubricated from the factory – ready to install out of the box.

 

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 15°

Dynamic Radial Load 8,775 lbf (39 kN)

Static Radial Load 8,212 lbf (36.5 kN)

Ball Diameter Dw 9.525 mm

Ceramic Balls per Bearing 25

Limiting Speed 22,000 r/min

Ball Material Silicon Nitride (Si₃N₄)

Ring Material Chrome Steel

Cage Material Phenolic Resin

Seal Type Open

Tolerance Class P4A

Preload Class L1 (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 CE/HCP4AL1DGA, 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, machining center spindles

 

High-Speed Electric Spindles – high-speed rotary units

 

Machining Center Spindles – vertical/horizontal spindle systems

 

Aerospace Components – gyroscopes, actuators, jet engine parts

 

Medical Equipment – high-speed dental handpieces, surgical tools, medical imaging devices

 

Semiconductor Manufacturing Equipment – precision wafer processing spindles

 

Precision Instruments – measuring devices, optical equipment

 

Industrial Robots – high-precision transmission mechanisms and rotary axes

 

Important Installation Notes

✅ This bearing set is universally matchable (DGA) – 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 L1 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).

 

✅ To achieve the 22,000 r/min limiting speed, oil-air or oil-mist lubrication is recommended.

 

⚠️ 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 CE/HCP4AL1DGA 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 15° contact angle (CE type), E-type high-speed design, hybrid ceramic technology (HC), P4A precision, L1 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 CE/HCP4AL1DGA for:

 

✅ Hybrid ceramic technology – 22,000 r/min ultra-high-speed performance

 

✅ 15° contact angle + E-type high-speed design – 8,775 lbf (39 kN) high load capacity

 

✅ Universal matchable – one inventory, infinite arrangements

 

✅ L1 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