Product Overview

The NMT 7013 CE/HCP4AH1DGA 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 36 mm, a 65 mm bore, and a 100 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 Class A extra light preload (GA), and equipped with two lubrication holes on the outer ring (H1) for efficient oil-air lubrication. It integrates ultra-high-speed performance, high load capacity, efficient lubrication, 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 33.2 kN (7,470 lbf) and a static load rating of 31 kN (6,975 lbf). 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, providing effective load sharing within a predetermined preload range. 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 maximum speed of 31,000 r/min. The set weighs only 0.78 kg with an operating temperature range of -30°C to 110°C.

 

Model Code Decoding – Understanding NMT 7013 CE/HCP4AH1DGA

Code Meaning

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

CE 15° contact angle + High-speed E-type design – 15° small contact angle provides ultra-high-speed low-heat operation; E-type optimizes internal geometry for higher speed capability and higher load capacity than equivalent B-type designs

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

H1 Two lubrication holes with annular groove on the outer ring – suitable for direct oil-air lubrication

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

Core Value: DGA universal matchability means every NMT 7013 CE/HCP4AH1DGA 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 generates less frictional heat at equivalent speeds, offering higher limiting speed potential than 25° designs. The E-type high-speed design offers higher speed capability and can accommodate heavier loads than equivalent B-type designs. HC hybrid ceramic technology drastically reduces centrifugal forces and frictional heat at high speeds. The H1 outer ring lubrication holes facilitate oil-air lubrication directly to the rolling contact zone. P4A super-precision ensures bore and OD tolerances are controlled within -0.004 mm to 0 – these six elements work together to make this bearing set a high-performance, efficiently lubricated, and flexible general-purpose precision bearing solution.

 

Core Performance Advantages

1. Hybrid Ceramic Technology – A Leap in 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.

 

2. 15° Contact Angle (CE Type) + High-Speed E-Type Design – Superior High-Speed Performance

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 8.731 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 maximum speed of 31,000 r/min. It is capable of accommodating heavy loads at relatively high speeds.

 

3. H1 Outer Ring Lubrication Holes – Maximized Oil-Air Lubrication Efficiency

The H1 suffix indicates two lubrication holes with an annular groove on the outer ring, enabling oil-air lubricant to reach the rolling contact zone directly for maximum lubrication and heat dissipation efficiency. This design ensures stable temperature performance even at 31,000 r/min ultra-high speeds, making it particularly suitable for oil-air lubrication systems.

 

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

 

Easy maintenance: Replace individual bearings without replacing entire matched sets

 

No shims required: Install directly to achieve design preload

 

5. 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. Preload force is 110 N with axial stiffness of 59 N/µm. This ensures stable temperature performance even at 31,000 r/min limiting speeds.

 

6. P4A Super-Precision Grade – Micron-Level 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, meeting stringent surface quality and dimensional consistency requirements. Operating temperature range is -30°C to 110°C.

 

7. 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 maximum speed.

 

8. 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. This combination offers significant cost advantages over full ceramic bearings while maintaining superior performance – a mature choice for high-volume industrial applications.

 

9. Clear Performance Specifications

 

Parameter Value

Bore d 65 mm

Outer Diameter D 100 mm

Total Width B 36 mm (2×18 mm)

Contact Angle 15°

Dynamic Radial Load 33.2 kN (7,470 lbf)

Static Radial Load 31 kN (6,975 lbf)

Ball Diameter Dw 8.731 mm

Ceramic Balls per Bearing 25

Maximum Speed 31,000 r/min

Preload Force (Class A) 110 N

Axial Stiffness (Class A) 59 N/µm

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 0.78 kg

Temperature Range -30°C to 110°C

Typical Applications

The NMT 7013 CE/HCP4AH1DGA, with its hybrid ceramic high-speed performance, H1 efficient lubrication, 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

 

High-Speed Motors and Spindle Drives – high-speed, high-precision motor applications

 

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 specifically optimized for direct oil-air lubrication. The H1 outer ring lubrication design (two lubrication holes with annular groove) enables oil-air lubricant to reach the rolling contact zone directly. To achieve the 31,000 r/min maximum speed, oil-air lubrication is strongly recommended.

 

✅ 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.

 

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

 

NMT Quality Commitment

Japan NMT (Enmutī) applies strict Japanese quality standards to every 7013 CE/HCP4AH1DGA 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), H1 outer ring oil-air lubrication design, 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 7013 series – offering the perfect balance of high performance, efficient lubrication, and flexible arrangement.

 

Choose NMT 7013 CE/HCP4AH1DGA for:

 

✅ Hybrid ceramic technology – 31,000 r/min ultra-high-speed performance

 

✅ H1 outer ring lubrication design – maximized oil-air lubrication efficiency

 

✅ 15° contact angle + E-type high-speed design – ultra-high speed and heavy 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

 

✅ Lightweight phenolic resin cage – low friction, low noise, high speed

 

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

 

✅ Factory pre-lubricated – ready to install