Product Overview

The NMT 7013 ACDGC/HCP4AL is an open, universally matchable single-row super-precision hybrid ceramic angular contact ball bearing. With a 65 mm bore, 100 mm outer diameter, and 18 mm width, this bearing features a 25° contact angle (AC type) and D-type high-capacity design, combined with silicon nitride (Si₃N₄) hybrid ceramic rolling elements (HC) and a phenolic resin cage, factory-preset with Class C moderate preload (GC) , and equipped with two lubrication holes, an annular groove, and two annular O-rings on the outer ring, specifically optimized for direct oil-air lubrication. It integrates ultra-precision rotational accuracy, very high load carrying capacity, excellent high-speed performance, and universal matchable flexibility into a single package, accommodating radial and unidirectional axial loads simultaneously.

 

The bearing offers a radial dynamic load rating of 8,775 lbf (39 kN) and a static load rating of 7,988 lbf (35.5 kN) . The GC universal matchable suffix indicates that this bearing features universal matchable (SU) capability – any two bearings 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 C moderate preload, the bearing achieves a limiting speed of 31,000 r/min. The operating temperature range is -30°C to 110°C. The bearing weighs only 0.36 kg.

 

Model Code Decoding – Understanding NMT 7013 ACDGC/HCP4AL

Code Meaning

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

AC Angular contact design with 25° contact angle

D D-type high-capacity design – optimized internal geometry for higher load capacity

GC Universal matchable + special internal clearance and preload optimization – features universal matchable (SU) capability, factory-preset Class C moderate preload

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

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

L Outer ring with two lubrication holes, annular groove, and O-rings – specifically designed for direct oil-air lubrication

Core Value: GC universal matchability means every NMT 7013 ACDGC/HCP4AL bearing's end-face height difference and parallelism are tightly controlled, allowing any two bearings of the same model to be directly paired without selective shimming or additional grinding. The AC-type 25° contact angle delivers superior axial rigidity while maintaining ample radial capacity. The D-type high-capacity design, with optimized rolling element parameters (ball diameter 11.112 mm, 20 ceramic balls per bearing), achieves outstanding load capacity. HC hybrid ceramic technology drastically reduces centrifugal forces and friction at high speeds. The L outer ring lubrication design enables oil-air lubricant to reach the rolling contact zone directly. 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 a high-performance, efficiently lubricated, and flexible flagship general-purpose precision bearing.

 

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. 25° Contact Angle (AC Type) + D-Type High-Capacity Design – High Load and High Rigidity Combined

The 25° contact angle delivers superior axial rigidity while maintaining ample radial capacity. The D-type high-capacity design, with optimized internal geometry and rolling element parameters (ball diameter 11.112 mm, 20 ceramic balls per bearing), achieves an outstanding 8,775 lbf (39 kN) dynamic and 7,988 lbf (35.5 kN) static load rating.

 

3. L Outer Ring Lubrication Design – Maximized Oil-Air Lubrication Efficiency

The L suffix indicates an outer ring with two lubrication holes, an annular groove, and two annular O-rings, specifically optimized for direct oil-air lubrication. This design enables oil-air lubricant to reach the rolling contact zone directly for maximum lubrication and heat dissipation efficiency, ensuring stable temperature performance even at 31,000 r/min ultra-high speeds.

 

4. Universal Matchable (GC) – One Inventory, Infinite Arrangements

GC 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, providing effective load sharing within a predetermined preload range

 

5. Class C Moderate Preload – Ideal for High-Speed Heavy-Load Applications

Class C moderate 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 31,000 r/min limiting speed.

 

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

The P4A tolerance class (superior to ABEC 7) 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 limiting 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

Width B 18 mm

Contact Angle 25°

Dynamic Radial Load 8,775 lbf (39 kN)

Static Radial Load 7,988 lbf (35.5 kN)

Ball Diameter Dw 11.112 mm

Ceramic Balls per Bearing 20

Limiting Speed 31,000 r/min

Ball Material Silicon Nitride (Si₃N₄)

Ring Material Chrome Steel

Cage Material Phenolic Resin

Seal Type Open

Tolerance Class P4A

Preload Class C (Moderate)

Arrangement Universal Matchable (SU)

Weight 0.36 kg

Temperature Range -30°C to 110°C

Typical Applications

The NMT 7013 ACDGC/HCP4AL, with its hybrid ceramic high-speed performance, L outer ring lubrication design, D-type high-capacity 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

 

Industrial Pumps and Compressors – high-speed rotating machinery

 

Important Installation Notes

✅ This bearing is universally matchable (GC) – any two bearings of the same model can be directly paired.

 

✅ This bearing is open design and specifically optimized for direct oil-air lubrication. The L outer ring lubrication design (two lubrication holes, annular groove, and O-rings) enables oil-air lubricant to reach the rolling contact zone directly. To achieve the 31,000 r/min limiting speed, oil-air lubrication is strongly recommended.

 

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

 

⚠️ This bearing comes with factory-preset Class C moderate 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 7013 ACDGC/HCP4AL bearing – 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 (AC type), D-type high-capacity design, hybrid ceramic technology (HC), L outer ring oil-air lubrication design, P4A precision, Class C moderate preload, and universal matchable flexibility makes this bearing the flagship general-purpose precision bearing in the NMT 7013 series – offering the perfect balance of high performance, efficient lubrication, and flexible arrangement.

 

Choose NMT 7013 ACDGC/HCP4AL for:

 

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

 

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

 

✅ 25° contact angle + D-type high capacity – 39 kN high load capacity

 

✅ Universal matchable – one inventory, infinite arrangements

 

✅ Class C moderate preload – ideal for high-speed heavy-load applications

 

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

 

✅ Lightweight phenolic resin cage

 

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