Product Overview

The NMT 7015 CDGC/P4A is an open, universally matchable single-row super-precision angular contact ball bearing. With a 75 mm bore, 115 mm outer diameter, and 20 mm width, this bearing features a 15° contact angle (CD type) and D-type high-capacity design, combined with all-steel rolling elements and a phenolic resin cage, factory-preset with Class C moderate preload (GC) . It integrates ultra-precision rotational accuracy, high load capacity, excellent high-speed performance, and universal matchable flexibility into a single package, accommodating radial and unidirectional axial loads simultaneously.

 

The bearing offers a basic dynamic load rating of 52.7 kN (11,858 lbf) and a static load rating of 49 kN (11,025 lbf) . 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 a 15° contact angle and Class C moderate preload, the bearing achieves a limiting speed of 24,000 r/min. The operating temperature range is -30°C to 110°C. The bearing weighs 0.617 – 0.63 kg.

 

Model Code Decoding – Understanding NMT 7015 CDGC/P4A

Code Meaning

7015 Basic series designation, 75 mm bore, 115 mm OD

CD 15° contact angle design – offers higher limiting speed and lower heat generation than 25° designs, optimized for high-speed performance and moderate axial load capacity

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

GC Universal matchable + Class C moderate preload – features universal matchable (SU) capability, factory-preset Class C moderate preload

P4A Super-precision tolerance class – surpassing ABEC 7 standards, running accuracy superior to P4

Core Value: GC universal matchability (SU) means every NMT 7015 CDGC/P4A 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 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, 20 balls per bearing – achieves an outstanding 52.7 kN (11,858 lbf) dynamic and 49 kN (11,025 lbf) static load rating. Class C moderate preload eliminates internal clearance, providing high system stiffness and precise shaft positioning. 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 a high-performance yet flexible flagship general-purpose precision 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 24,000 r/min. The D-type high-capacity design, with optimized rolling element parameters – ball diameter 12.7 mm, 20 balls per bearing – achieves an outstanding 52.7 kN (11,858 lbf) dynamic and 49 kN (11,025 lbf) static load rating. Compared to equivalent B and E type high-speed bearings, the D-type design is best suited for heavier loads.

 

2. 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, providing high system stiffness and precise shaft positioning. This ensures stable temperature performance even at the 24,000 r/min limiting speed.

 

3. 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

 

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

The P4A tolerance class guarantees minimal radial runout and vibration. 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.

 

5. 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 24,000 r/min limiting speed.

 

6. All-Steel Construction – High Rigidity, Impact Resistance, Cost-Effectiveness

Premium chrome steel rings and balls offer higher fracture toughness and impact resistance – more reliable under interrupted cutting and accidental overload conditions. All-steel bearings also offer significant cost advantages for high-volume industrial applications.

 

7. Open Design – Flexible Lubrication Options

This bearing features an open design, allowing flexible selection of lubrication methods based on application. The bearing comes pre-lubricated from the factory – ready to install out of the box.

 

8. Clear Performance Specifications

 

Parameter Value

Bore d 75 mm

Outer Diameter D 115 mm

Width B 20 mm

Contact Angle 15°

Dynamic Load Rating C 52.7 kN (11,858 lbf)

Static Load Rating C₀ 49 kN (11,025 lbf)

Fatigue Load Limit Pu 2.08 kN

Limiting Speed 24,000 r/min

Ball Diameter Dw 12.7 mm

Balls per Bearing 20

Distance to Pressure Point a 22.8 mm

Ball Material Chrome Steel

Ring Material Chrome Steel

Cage Material Phenolic Resin

Seal Type Open

Tolerance Class P4A

Preload Class C (Moderate)

Arrangement Universal Matchable (SU)

Weight 0.617 – 0.63 kg

Temperature Range -30°C to 110°C

Typical Applications

The NMT 7015 CDGC/P4A, with its Class C moderate-preload high rigidity, 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

 

Automotive Transmissions – precision transmission systems handling both radial and axial loads

 

Important Installation Notes

✅ This bearing is universally matchable (GC) – any two bearings of the same model can be directly paired. Configurable as back-to-back (<>), face-to-face (><), or tandem (>>) arrangements.

 

✅ This bearing features an 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.

 

✅ To achieve the 24,000 r/min limiting speed, oil-air or oil-mist lubrication is recommended.

 

⚠️ 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).

 

⚠️ A single-row angular contact ball bearing can accommodate axial load in one direction only. Paired installations (DB/DF/DT) are required for bidirectional axial load capacity.

 

⚠️ Ensure the contact angle direction matches the intended load direction – incorrect orientation will eliminate load capacity.

 

⚠️ Ensure shaft and housing bore concentricity and straightness meet P4A grade requirements to achieve the expected rotational accuracy and service life.

 

NMT Quality Commitment

Japan NMT (Enmutī) applies strict Japanese quality standards to every 7015 CDGC/P4A bearing – from ring material (high-purity chrome steel) and rolling elements 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 (CD type), D-type high-capacity design, P4A precision, Class C moderate preload, and universal matchable flexibility makes this bearing the flagship general-purpose precision bearing in the NMT 7015 series – offering the perfect balance of high performance, high load capacity, and flexible arrangement.

 

Choose NMT 7015 CDGC/P4A for:

 

✅ 15° contact angle + D-type high capacity – 52.7 kN (11,858 lbf) high load capacity

 

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

 

✅ Universal matchable – one inventory, infinite arrangements

 

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

 

✅ 24,000 r/min ultra-high-speed performance

 

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

 

✅ All-steel – high rigidity, impact resistance, cost-effectiveness

 

✅ Factory pre-lubricated – ready to install