Product Overview

The NMT 7014 CD/P4ADGC 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 70 mm bore, and a 110 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 C moderate preload (DGC). It integrates high load capacity, excellent speed performance, Class C moderate-preload high rigidity, 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 18,720 lbf (83.2 kN) and a static load rating of 20,588 lbf (91.5 kN). The DGC 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 with Class C moderate preload, the set achieves a limiting speed of 22,000 r/min. The bore and outside diameter tolerances are controlled within -0.004 mm to 0. The set weighs 1.19 kg with an operating temperature range of -30°C to 110°C.

 

Model Code Decoding – Understanding NMT 7014 CD/P4ADGC

Code Meaning

7014 Basic series designation, 70 mm bore (14×5 mm), 110 mm OD, 40 mm total width

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

P4A Super-precision tolerance class – surpassing ABEC 7/ISO P4 standards

DGC Duplex General Arrangement + Class C preload – 2-bearing matched set with universal matchable (SU) capability, factory-preset Class C moderate preload

Core Value: DGC universal matchability (SU) means every NMT 7014 CD/P4ADGC 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, 19 balls per bearing – achieves outstanding load capacity. Class C moderate preload provides the optimal balance between high-speed capability and system rigidity. 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 set a high-capacity, high-speed, Class C moderate-preload high-rigidity, 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 18,720 lbf (83.2 kN) , static load rating 20,588 lbf (91.5 kN) .

 

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 22,000 r/min. The D-type high-capacity design, with optimized rolling element parameters – ball diameter 12.7 mm, 19 balls per bearing – achieves an outstanding 18,720 lbf dynamic and 20,588 lbf static load rating. This creates an exceptionally rigid bearing system that provides superior support, minimizing axial and radial play.

 

3. 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. It enhances system rigidity and reduces deflection under load. This ensures stable temperature performance even at the 22,000 r/min limiting speed.

 

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

DGC 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 (surpassing ABEC 7/ISO P4 standards) 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 – Speed and Durability Combined

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 and operates smoothly with minimal friction at high velocities, contributing to reduced centrifugal forces, friction, and heat generation – a key factor in achieving the 22,000 r/min 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, enabling efficient heat dissipation and sustained precision performance. The set comes pre-lubricated from the factory – ready to install out of the box.

 

9. Clear Performance Specifications

 

Parameter Value

Bore d 70 mm

Outer Diameter D 110 mm

Total Width B 40 mm (2×20 mm)

Contact Angle 15°

Dynamic Radial Load 18,720 lbf (83.2 kN)

Static Radial Load 20,588 lbf (91.5 kN)

Ball Diameter Dw 12.7 mm

Balls per Bearing 19

Limiting Speed 22,000 r/min

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)

Bearings in Set 2

Weight 1.19 kg

Temperature Range -30°C to 110°C

Typical Applications

The NMT 7014 CD/P4ADGC, with its duplex universal matchable rigidity, D-type high-capacity design, Class C moderate preload, 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

 

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 22,000 r/min limiting speed, oil-air or oil-mist lubrication is recommended.

 

⚠️ This set 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).

 

✅ 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 DGC 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 7014 CD/P4ADGC delivers P4A accuracy, 15° contact angle ultra-high-speed performance, D-type high-capacity design, Class C moderate preload (18,720 lbf / 20,588 lbf), and universal matchable flexibility for unparalleled rotational support in your premier high-speed spindles.

 

Choose NMT 7014 CD/P4ADGC for:

 

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

 

✅ 15° contact angle + D-type high capacity – 18,720 lbf (83.2 kN) 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

 

✅ 22,000 r/min ultra-high-speed performance

 

✅ 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