Product Overview

The NMT 7013 CD/P4A is an open, 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 cotton fabric reinforced phenolic cage. It integrates ultra-high precision, high load capacity, and excellent speed performance 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, the bearing achieves a limiting speed of 14,000 r/min under grease lubrication and 22,000 r/min under oil lubrication. The bearing weighs 0.42 kg with an operating temperature range up to 300 °F (approx. 149°C) .

 

Model Code Decoding – Understanding NMT 7013 CD/P4A

Code Meaning

7013 Basic series designation, 65 mm bore, 100 mm OD

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

P4A Super-precision tolerance class – superior to ABEC 7 standards

No G/GA suffix Non-universal matchable single bearing – for paired configurations (DB, DF, DT), order the corresponding pre-matched set

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 11.112 mm, 20 balls per bearing), achieves an outstanding 41.6 kN dynamic and 37.5 kN static load rating. P4A super-precision ensures bore and OD tolerances are controlled within micron-level ranges. The cotton fabric reinforced phenolic cage provides excellent guidance accuracy and low friction at high speeds – these four elements work together to make this bearing a high-capacity, ultra-high-speed, ultra-precision general-purpose bearing solution.

 

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 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.

 

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

The P4A super-precision tolerance class 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 up to 300 °F (approx. 149°C) .

 

3. Cotton Fabric Reinforced Phenolic Cage – Speed and Durability Combined

The cotton fabric reinforced phenolic 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 lubrication limiting speed.

 

4. 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 lubrication for high-speed precision machining (22,000 r/min).

 

5. 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.

 

6. 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

Speed (Grease) 14,000 r/min

Speed (Oil) 22,000 r/min

Ball Diameter Dw 11.112 mm

Balls per Bearing 20

Ball Material Chrome Steel

Ring Material Chrome Steel

Cage Material Cotton Fabric Reinforced Phenolic

Seal Type Open

Tolerance Class P4A

Preload None (Single Bearing)

Arrangement Non-Universal Matchable

Weight 0.42 kg

Temperature Range Up to 300 °F (approx. 149°C)

Typical Applications

The NMT 7013 CD/P4A, 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

 

Gas Turbines and Centrifugal Separators – high-speed rotating machinery

 

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 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.

 

NMT Quality Commitment

Japan NMT (Enmutī) applies strict Japanese quality standards to every 7013 CD/P4A bearing – from ring material (high-purity chrome steel) and rolling elements to superfinishing processes. The combination of 15° contact angle (CD type), D-type high-capacity design, P4A super-precision, and cotton fabric reinforced phenolic cage makes this bearing the flagship general-purpose precision bearing in the NMT 7013 series – offering the perfect balance of high load capacity, ultra-high speed, and ultra-precision performance.

 

Choose NMT 7013 CD/P4A for:

 

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

 

✅ P4A super-precision running accuracy

 

✅ 22,000 r/min oil lubrication limiting speed

 

✅ Cotton fabric reinforced phenolic cage – speed and durability combined

 

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

 

✅ Open design – flexible lubrication options