Product Overview

The NMT 7015 CD/P4ADGA is a pre-assembled duplex universally matchable super-precision all-steel angular contact ball bearing set, comprising 2 rows of bearings precision-paired in a universal matchable (SU) configuration. With a total width of 40 mm (20 mm per row × 2), a 75 mm bore, and a 115 mm outer diameter, this set 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 A extra light preload (GA). It integrates high load capacity, excellent speed performance, and flexible arrangement capability into a single package, accommodating radial and bidirectional axial loads simultaneously.

 

The bearing set offers a radial dynamic load rating of 85.2 kN (19,153 lbf) and a static load rating of 98 kN (22,031 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. Users can freely configure them in back-to-back (<>), face-to-face (><), or tandem (>>) arrangements. Manufactured to the P4A super-precision tolerance class (ABEC 7) with C0 internal clearance and Class A extra light preload, the set achieves a limiting speed of 11,000 r/min under grease lubricationand 18,000 r/min under oil-air lubrication. The set weighs 1.31 kg (2.88 lb) with an operating temperature range of -30°C to 110°C.

 

Model Code Decoding – Understanding NMT 7015 CD/P4ADGA

Code Meaning

7015 Basic series designation, 75 mm bore (15×5 mm), 115 mm OD

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

P4A Super-precision tolerance class – ABEC 7 / ISO P4, bore and OD tolerances -0.004 mm to 0

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

Core Value: DGA universal matchability (SU) means every NMT 7015 CD/P4ADGA 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 85.2 kN (19,153 lbf) dynamic and 98 kN (22,031 lbf) static load rating. P4A super-precision ensures bore and OD tolerances are controlled within -0.004 mm to 0 – these four elements work together to make this bearing set a high-capacity, high-speed, and flexible flagship precision bearing solution.

 

Core Performance Advantages

1. Duplex Universal Matchable Set – Doubled System Rigidity and Load Capacity

This bearing set comprises 2 rows of bearings precision-matched into one unit, delivering double the load capacity and system rigidity. The universal matchable (SU) feature allows flexible configuration in back-to-back (<>), face-to-face (><), or tandem (>>) arrangements. Both bearings undergo factory end-face matching grinding, ensuring uniform load distribution across both rows, preventing individual bearing overload, and significantly extending overall set service life. Dynamic load rating 85.2 kN (19,153 lbf) , static load rating 98 kN (22,031 lbf) . The set weighs 1.31 kg (2.88 lb) .

 

2. 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 18,000 r/min under oil-air lubrication. The D-type high-capacity design, with optimized rolling element parameters – ball diameter 12.7 mm, 20 balls per bearing – achieves an outstanding 85.2 kN (19,153 lbf) dynamic and 98 kN (22,031 lbf) static load rating. Compared to equivalent B and E type high-speed bearings, the D-type design is best suited for heavier loads.

 

3. 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. This ensures stable temperature performance even at the 18,000 r/min oil-air lubrication limiting speed.

 

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

The P4A tolerance class (ABEC 7 / ISO P4) guarantees minimal radial runout and axial play. Bore and outside diameter tolerances are -0.004 mm to 0. Both bearings undergo factory precision end-face matching grinding, ensuring highly uniform load distribution across both rows. Operating temperature range is -30°C to 110°C.

 

6. 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 18,000 r/min oil-air lubrication limiting speed.

 

7. 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.

 

8. Open Design – Flexible Lubrication Options

This set features an open design, allowing flexible selection of lubrication methods based on application requirements – grease lubrication for general applications (11,000 r/min), oil-air lubrication for high-speed precision machining (18,000 r/min).

 

9. Clear Performance Specifications

 

Parameter Value

Bore d 75 mm

Outer Diameter D 115 mm

Total Width B 40 mm (2×20 mm)

Contact Angle 15°

Dynamic Radial Load 85.2 kN (19,153 lbf)

Static Radial Load 98 kN (22,031 lbf)

Ball Diameter Dw 12.7 mm

Balls per Bearing 20

Speed (Grease) 11,000 r/min

Speed (Oil-Air) 18,000 r/min

Ball Material Chrome Steel

Ring Material Chrome Steel

Cage Material Phenolic Resin

Seal Type Open

Tolerance Class P4A (ABEC 7)

Internal Clearance C0

Preload Class A (Extra Light)

Arrangement Universal Matchable (SU)

Bearings in Set 2

Weight 1.31 kg (2.88 lb)

Temperature Range -30°C to 110°C

Typical Applications

The NMT 7015 CD/P4ADGA, with its duplex universal matchable rigidity, D-type high-capacity design, and P4A super-precision grade, 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 is a duplex fixed matched set – the 2 bearings are supplied as one complete unit. Do not separate or mix with other bearings of the same model.

 

✅ This set features universal matchable (SU) capability – freely configurable as back-to-back (<>), face-to-face (><), or tandem (>>) arrangements.

 

✅ This set is open design – select appropriate lubrication method based on application. To achieve the 18,000 r/min oil-air lubrication limiting speed, oil-air or oil-mist lubrication is recommended; grease lubrication limits speed to 11,000 r/min.

 

⚠️ 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).

 

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

 

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

 

NMT Quality Commitment

Japan NMT (Enmutī) applies the most stringent end-face matching grinding and preload control to every DGA duplex bearing set. Both bearings undergo complete factory matching and full-parameter inspection, ensuring load-sharing deviation between rows is minimized to an extremely small range. The 7015 CD/P4ADGA delivers P4A accuracy, 15° contact angle ultra-high-speed performance, D-type high-capacity design, Class A extra light preload, and universal matchable flexibility for unparalleled rotational support in your premier high-speed spindles.

 

Choose NMT 7015 CD/P4ADGA for:

 

✅ Duplex universal matchable set – doubled system rigidity and load capacity

 

✅ 15° contact angle + D-type high capacity – 85.2 kN (19,153 lbf) high load capacity

 

✅ Class A extra light preload – ideal for high-speed precision applications

 

✅ Universal matchable – one inventory, infinite arrangements

 

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

 

✅ 18,000 r/min oil-air lubrication limiting speed

 

✅ Phenolic resin cage – low friction, low noise, high speed

 

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

 

✅ Factory pre-matched and pre-lubricated – ready to install