Product Overview

The NMT 7014 CD/HCP4A is an open, single-row super-precision hybrid ceramic angular contact ball bearing. With a 70 mm bore, 110 mm outer diameter, and 20 mm width, this bearing features a 15° contact angle (CD type) and D-type high-capacity design, combined with silicon nitride (Si₃N₄) hybrid ceramic rolling elements (HC) and a phenolic resin cage. It integrates ultra-high load capacity, super-precision rotational accuracy, and excellent speed performance into a single package, accommodating radial and unidirectional axial loads simultaneously.

 

The bearing offers a basic dynamic load rating of 52 kN (11,690 lbf) and a static load rating of 45.5 kN (10,229 lbf) . Manufactured to the P4A super-precision tolerance class (dimensional accuracy to ISO Class 4, running accuracy superior to ISO Class 4)with a 15° contact angle and hybrid ceramic technology, the bearing achieves a limiting speed of 14,000 r/min under grease lubrication and 22,000 r/min under oil-air lubrication. The bearing weighs only 0.49 kg with an operating temperature range of -30°C to 110°C.

 

Model Code Decoding – Understanding NMT 7014 CD/HCP4A

Code Meaning

7014 Basic series designation, 70 mm bore, 110 mm OD

CD 15° contact angle design – offers higher limiting speed and lower heat generation than 25° designs

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

P4A Super-precision tolerance class – dimensional accuracy to ISO Class 4, running accuracy superior to ISO Class 4

Core Value: The CD-type 15° contact angle generates less frictional heat at equivalent speeds, offering higher limiting speed potential than 25° designs. The D-type high-capacity design, with optimized rolling element parameters – ball diameter 12.7 mm, 19 balls per bearing – achieves an outstanding 52 kN dynamic and 45.5 kN static load rating. It is best suited for heavier loads compared to equivalent B and E type high-speed bearings. HC hybrid ceramic technology drastically reduces centrifugal forces and frictional heat at high speeds. P4A super-precision ensures running accuracy superior to ISO Class 4 – these four elements work together to make this bearing a high-capacity, ultra-high-speed, ultra-precision flagship general-purpose bearing.

 

Core Performance Advantages

1. 15° Contact Angle (CD Type) + D-Type High-Capacity Design – Ultra-High Speed and High Load Combined

The 15° small contact angle generates less frictional heat at equivalent speeds, offering higher limiting speed potential than 25° designs, with a limiting speed of 22,000 r/min under oil-air lubrication. The D-type high-capacity design, with optimized rolling element parameters – ball diameter 12.7 mm, 19 balls per bearing – achieves an outstanding 52 kN (11,690 lbf) dynamic and 45.5 kN (10,229 lbf) static load rating. Compared to equivalent B and E type high-speed bearings, the D-type design is best suited for heavier loads. This bearing is specifically designed for heavy loads at relatively high speeds.

 

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, significantly extending bearing service life.

 

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

The P4A tolerance class (dimensional accuracy to ISO Class 4, running accuracy superior to ISO Class 4) guarantees minimal radial runout and axial play. Bore and outside diameter tolerances are controlled within micron-level ranges, meeting stringent surface quality and dimensional consistency requirements. Operating temperature range is -30°C to 110°C.

 

4. 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 22,000 r/min oil-air lubrication limiting speed.

 

5. 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.

 

6. Open Design – Flexible Lubrication Options

This bearing features an open design with no seals, allowing flexible selection of lubrication methods based on application – grease lubrication for general applications (14,000 r/min), oil-air lubrication for high-speed precision machining (22,000 r/min).

 

7. Clear Performance Specifications

 

Parameter Value

Bore d 70 mm

Outer Diameter D 110 mm

Width B 20 mm

Contact Angle 15°

Dynamic Load Rating C 52 kN (11,690 lbf)

Static Load Rating C₀ 45.5 kN (10,229 lbf)

Fatigue Load Limit Pu 1.93 kN

Ball Diameter Dw 12.7 mm

Balls per Bearing 19

Speed (Grease) 14,000 r/min

Speed (Oil-Air) 22,000 r/min

Ball Material Silicon Nitride (Si₃N₄)

Ring Material Chrome Steel

Cage Material Phenolic Resin

Seal Type Open

Tolerance Class P4A

Preload None (Single Bearing)

Arrangement Non-Universal Matchable

Weight 0.49 kg

Temperature Range -30°C to 110°C

Typical Applications

The NMT 7014 CD/HCP4A, with its high load capacity, ultra-high speed, and ultra-precision 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 – high-speed rotary units

 

Machining Center Spindles – vertical/horizontal spindle systems

 

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

 

Precision Rotary Tables – high-accuracy rotary positioning

 

Aerospace Components – gyroscopes, actuators, jet engine parts

 

Semiconductor Manufacturing Equipment – precision wafer processing spindles

 

Industrial Pumps and Compressors – high-speed rotating machinery

 

Important Installation Notes

✅ This is a single-row open design bearing – select appropriate lubrication method based on application: grease lubrication for general applications (limiting speed 14,000 r/min), oil-air lubrication for high-speed precision machining (limiting speed 22,000 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 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.

 

⚠️ This bearing has no preload setting – preload must be adjusted during paired installation based on the specific configuration.

 

⚠️ 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 7014 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), D-type high-capacity design, hybrid ceramic technology (HC), P4A super-precision, and phenolic resin cage makes this bearing the flagship general-purpose precision bearing in the NMT 7014 series – offering the perfect balance of high load capacity, ultra-high speed, and ultra-precision performance.

 

Choose NMT 7014 CD/HCP4A for:

 

✅ 15° contact angle + D-type high capacity – 52 kN (11,690 lbf) high load capacity

 

✅ Hybrid ceramic technology – 22,000 r/min oil-air lubrication limiting speed

 

✅ P4A super-precision running accuracy – superior to ISO Class 4

 

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

 

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

 

✅ Open design – flexible lubrication options

 

✅ Single-row design – flexible adaptation to various spindle configurations