Product Overview

The NMT 7013 CDGA/P4A is an open, universally matchable single-row super-precision angular contact ball bearing. With a 65 mm bore, 100 mm outer diameter, and 18 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 A extra light preload (GA) . It integrates ultra-precision rotational accuracy, high load capacity, excellent speed performance, and universal matchable flexibility into a single package, accommodating radial and unidirectional axial loads simultaneously.

 

The bearing offers a radial dynamic load rating of 41.6 kN (9,352 lbf) and a static load rating of 37.5 kN (8,430 lbf) . Manufactured to the P4A super-precision tolerance class with bore and OD tolerances controlled within -0.004 mm to 0, 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 0.42 – 0.43 kg with an operating temperature range of -30°C to 110°C.

 

Model Code Decoding – Understanding NMT 7013 CDGA/P4A

Code Meaning

7013 Basic series designation, 65 mm bore (13×5 mm), 100 mm OD

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

G Single bearing (not a pre-assembled set)

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

P4A Super-precision tolerance class – dimensional accuracy to ISO P4 class, running accuracy superior to P4

Core Value: GA universal matchability (SU) means every NMT 7013 CDGA/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 selective shimming or additional 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 11.112 mm, 20 balls per bearing), achieves outstanding load capacity. Class A extra light preload eliminates internal clearance and reduces vibration and noise at high speeds. 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 22,000 r/min under oil-air lubrication. The D-type high-capacity design, with optimized rolling element parameters – ball diameter 11.112 mm, 20 balls per bearing – achieves an outstanding 41.6 kN (9,352 lbf) dynamic and 37.5 kN (8,430 lbf) static load rating. This bearing is specifically designed for high-speed heavy-load applications, capable of accommodating heavy loads at relatively high speeds.

 

2. Universal Matchable (GA) – One Inventory, Infinite Arrangements

GA 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, providing effective load sharing within a predetermined preload range

 

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

 

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

The P4A tolerance class (dimensional accuracy to ISO P4 class, running accuracy superior to P4) guarantees minimal radial runout and axial play. 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, contributing to reduced centrifugal forces, friction, and heat generation – a key factor in achieving the 22,000 r/min oil-air lubrication 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 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).

 

8. Clear Performance Specifications

 

Parameter Value

Bore d 65 mm

Outer Diameter D 100 mm

Width B 18 mm

Contact Angle 15°

Dynamic Radial Load 41.6 kN (9,352 lbf)

Static Radial Load 37.5 kN (8,430 lbf)

Fatigue Load Limit Pu 1.6 kN

Ball Diameter Dw 11.112 mm

Balls per Bearing 20

Speed (Grease) 14,000 r/min

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

Ball Material Chrome Steel

Ring Material Chrome Steel

Cage Material Phenolic Resin

Seal Type Open

Tolerance Class P4A

Preload Class A (Extra Light)

Arrangement Universal Matchable (SU)

Weight 0.42 – 0.43 kg

Temperature Range -30°C to 110°C

Typical Applications

The NMT 7013 CDGA/P4A, with its high load capacity, ultra-precision, excellent speed performance, 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

 

High-Precision Industrial Gearboxes – precision transmission systems

 

Pumps and Compressors – high-speed rotating machinery

 

Aerospace Components – gyroscopes, actuators, jet engine parts

 

Semiconductor Manufacturing Equipment – precision wafer processing spindles

 

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

 

Important Installation Notes

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

 

✅ This bearing is open design – select appropriate lubrication method based on application. To achieve the 22,000 r/min oil-air lubrication limiting speed, oil-air or oil-mist lubrication is recommended; grease lubrication limits speed to 14,000 r/min.

 

✅ For paired installations, using bearings from the same production batch is recommended for optimal consistency.

 

⚠️ This bearing 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).

 

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

 

⚠️ 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.

 

NMT Quality Commitment

Japan NMT (Enmutī) applies strict Japanese quality standards to every 7013 CDGA/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 A extra light preload, and universal matchable flexibility makes this bearing the flagship general-purpose precision bearing in the NMT 7013 series – offering the perfect balance of high performance, high load capacity, and flexible arrangement.

 

Choose NMT 7013 CDGA/P4A for:

 

✅ 15° contact angle + D-type high capacity – 41.6 kN (9,352 lbf) high load capacity

 

✅ Universal matchable – one inventory, infinite arrangements

 

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

 

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

 

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

 

✅ Lightweight phenolic resin cage

 

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

 

✅ Open design – flexible lubrication options