Product Overview

The NMT 7010 CD/HCP4A is an open, single-row super-precision hybrid ceramic angular contact ball bearing. With a 50 mm bore, 80 mm outer diameter, and 16 mm width, this bearing features a 15° contact angle (CD type) and high-capacity design, combined with silicon nitride (Si₃N₄) hybrid ceramic rolling elements (HC)  and a lightweight phenolic resin cage. It delivers an exceptional balance of high load capacity and super-precision rotational accuracy within a compact envelope, accommodating radial and unidirectional axial loads simultaneously.

 

The bearing offers a basic dynamic load rating of 29.6 kN and a static load rating of 24.0 kN. Manufactured to the P4A super-precision tolerance class with hybrid ceramic technology, the bearing achieves a reference speed of 20,000 r/min under grease lubrication and a limiting speed of 32,000 r/min under oil lubrication.

 

Model Code Decoding – Understanding NMT 7010 CD/HCP4A

Code Meaning

7010 Basic series designation, 50 mm bore, 80 mm OD

CD 15° contact angle design – offers higher limiting speed and lower heat generation than 25° designs, ideal for ultra-high-speed operation

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

P4A Super-precision tolerance class – dimensional accuracy to ISO P4 class (ABEC 7), running accuracy superior to P4

Core Value: The CD-type 15° contact angle generates less frictional heat at high speeds, providing the foundation for exceptional limiting speeds. HC hybrid ceramic technology drastically reduces centrifugal forces and frictional heat at high speeds, extending bearing service life. P4A super-precision ensures bore and OD tolerances are controlled within micron-level ranges – these three elements work together to make this bearing a high-capacity, ultra-high-speed precision bearing solution.

 

Core Performance Advantages

1. 15° Contact Angle (CD Type) – The Perfect Balance of Speed and Load

The 15° small contact angle generates less frictional heat at equivalent speeds, offering higher limiting speed potential than 25° contact angle designs. Combined with the high-capacity design, it achieves an outstanding 29.6 kN dynamic and 24.0 kN static load rating within a compact 16 mm width.

 

2. 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.

 

3. High-Capacity Design – High Load in Compact Space

Through optimized internal geometry and rolling element parameters (ball diameter 9.525 mm, 18 balls per bearing), it achieves an outstanding 29.6 kN dynamic and 24.0 kN static load rating within a limited installation space. The bearing weighs only 0.22 kg.

 

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

The P4A tolerance class (ABEC 7) guarantees minimal radial runout and axial play. Bore tolerance -0.006mm to 0, outside diameter tolerance -0.007mm to 0, meeting stringent surface quality and dimensional consistency requirements. Operating temperature range is -30°C to 110°C.

 

5. 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 32,000 r/min limiting speed.

 

6. Clear Performance Specifications

 

Parameter Value

Bore d 50 mm

Outer Diameter D 80 mm

Width B 16 mm

Contact Angle 15°

Dynamic Load Rating C 29.6 kN (6,660 lbf)

Static Load Rating C₀ 24.0 kN (5,400 lbf)

Fatigue Load Pu 1.02 kN

Speed (Grease) 20,000 r/min

Speed (Oil) 32,000 r/min

Ball Diameter Dw 9.525 mm

Balls per Bearing 18

Ball Material Silicon Nitride (Si₃N₄)

Ring Material Chrome Steel

Cage Material Phenolic

Seal Type Open

Tolerance Class P4A (ABEC 7)

Weight 0.22 kg

Temperature Range -30°C to 110°C

Typical Applications

The NMT 7010 CD/HCP4A, with its high load capacity, super-precision, and high-speed performance, 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 – PCB drilling, micro-machining, engraving/milling

 

Machining Center Spindles – vertical/horizontal spindle systems

 

High-Frequency Motors – high-speed, high-precision motor applications

 

Aerospace Components – gyroscopes, actuators, jet engine parts

 

Medical Equipment – high-speed dental drills and medical imaging devices

 

Semiconductor Manufacturing Equipment – precision wafer processing spindles

 

Gas Turbines and Centrifugal Separators – high-speed rotating machinery

 

Important Installation Notes

✅ This is a single-row open design bearing – select appropriate lubrication method based on application. To achieve the 32,000 r/min limiting speed, oil lubrication is recommended; grease lubrication limits speed to 20,000 r/min.

 

✅ This is a non-universal matchable single bearing (no G/GA suffix). For paired configurations (DB, DF, DT arrangements), please order the corresponding pre-matched set.

 

✅ Ensure shaft and housing fits comply with P4A grade requirements (bore tolerance -0.006mm to 0, OD tolerance -0.007mm to 0) to achieve the expected rotational accuracy and service life.

 

⚠️ A single-row angular contact ball bearing can accommodate axial load in one direction only. Radial loads generate an additional axial force that must be counteracted through paired mounting.

 

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

 

NMT Quality Commitment

Japan NMT (Enmutī) applies strict Japanese quality standards to every 7010 CD/HCP4A bearing – from ring material (high-purity chrome steel), ceramic balls (HIP silicon nitride), to superfinishing processes. The combination of 15° contact angle (CD type), high-capacity design, hybrid ceramic technology (HC), and P4A super-precision makes this bearing the flagship precision bearing in the NMT 7010 series – offering the perfect balance of high load capacity and ultra-high-speed performance.

 

Choose NMT 7010 CD/HCP4A for:

 

✅ 15° contact angle (CD type) – perfect balance of speed and load

 

✅ Hybrid ceramic technology – 32,000 r/min ultra-high-speed performance

 

✅ High-capacity design – 29.6 kN powerful load capacity

 

✅ P4A super-precision running accuracy

 

✅ Lightweight phenolic resin cage

 

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