Product Overview

The NMT 7014 CE/P4A is an open, single-row super-precision angular contact ball bearing. With a 70 mm bore, 110 mm outer diameter, and 20 mm width, this bearing features a 15° contact angle and high-speed E-type design, combined with all-steel rolling elements and a phenolic resin cage. It integrates ultra-precision rotational accuracy, high load capacity, and excellent high-speed performance into a single package, accommodating radial and unidirectional axial loads simultaneously.

 

The bearing offers a basic dynamic load rating of 23.8 kN and a static load rating of 18.3 kN. Manufactured to the P4A super-precision tolerance class (ABEC 7) with a 15° contact angle and E-type high-speed design, the bearing achieves a limiting speed of 17,000 r/min under grease lubrication and 27,000 r/min under oil-air lubrication. The bearing weighs only 0.61 kg with an operating temperature range of -30°C to 110°C.

 

Model Code Decoding – Understanding NMT 7014 CE/P4A

Code Meaning

7014 Basic series designation, 70 mm bore, 110 mm OD

CE 15° contact angle + High-speed E-type design – 15° small contact angle offers higher limiting speed potential and lower heat generation; E-type optimizes internal geometry for higher speed capability compared to equivalent B-type designs

P4A Super-precision tolerance class (ABEC 7) – dimensional accuracy to ISO P4 class

Core Value: The CE-type 15° contact angle + E-type high-speed design generates less frictional heat at equivalent speeds, offering higher limiting speed potential (oil-air lubrication 27,000 r/min). P4A super-precision ensures bore and OD tolerances are controlled within micron-level ranges, meeting stringent surface quality and dimensional consistency requirements. The phenolic resin 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.

 

Core Performance Advantages

1. 15° Contact Angle + E-Type High-Speed 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 27,000 r/min under oil-air lubrication. The E-type high-speed design optimizes internal geometry and rolling element parameters – ball diameter 9.525 mm, 25 balls per bearing – achieving an outstanding 23.8 kN dynamic and 18.3 kN static load rating. Compared to equivalent B-type designs, the E-type design offers higher speed capability.

 

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

The P4A tolerance class (ABEC 7) guarantees minimal radial runout and axial play. Bore tolerance -0.007 mm to 0, outside diameter tolerance -0.008 mm to 0, meeting stringent surface quality and dimensional consistency requirements. Operating temperature range is -30°C to 110°C.

 

3. 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 27,000 r/min oil-air lubrication limiting speed.

 

4. 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.

 

5. 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 (17,000 r/min), oil-air lubrication for high-speed precision machining (27,000 r/min).

 

6. Clear Preload and Stiffness Parameters

This bearing supports universal matching with three preload class options:

 

Class A (GA): Preload 130 N, axial stiffness 57 N/µm

 

Class B (GB): Preload 380 N, axial stiffness 88 N/µm

 

Class C (GC): Preload 760 N, axial stiffness 120 N/µm

 

7. Clear Performance Specifications

 

Parameter Value

Bore d 70 mm

Outer Diameter D 110 mm

Width B 20 mm

Contact Angle 15°

Dynamic Load Rating C 23.8 kN

Static Load Rating C₀ 18.3 kN

Fatigue Load Limit Pu 0.78 kN

Speed (Grease) 17,000 r/min

Speed (Oil-Air) 27,000 r/min

Ball Diameter Dw 9.525 mm

Balls per Bearing 25

Ball Material Chrome Steel

Ring Material Chrome Steel

Cage Material Phenolic Resin

Seal Type Open

Tolerance Class P4A (ABEC 7)

Preload Not applicable (Single Bearing)

Arrangement Non-Universal Matchable

Weight 0.61 kg

Temperature Range -30°C to 110°C

Typical Applications

The NMT 7014 CE/P4A, with its ultra-high speed, ultra-precision, and high load capacity, 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

 

Aerospace Components – gyroscopes, actuators, jet engine parts

 

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

 

Semiconductor Manufacturing Equipment – precision wafer processing spindles

 

Precision Rotary Tables – high-accuracy rotary positioning

 

Industrial Robots – high-precision transmission mechanisms and rotary axes

 

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 17,000 r/min), oil-air lubrication for high-speed precision machining (limiting speed 27,000 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 (bore tolerance -0.007 mm to 0, OD tolerance -0.008 mm to 0) 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 marked as "not applicable") – 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 7014 CE/P4A bearing – from ring material (high-purity chrome steel) and rolling elements to superfinishing processes. The combination of 15° contact angle, E-type high-speed design, P4A super-precision, and phenolic resin cage makes this bearing the flagship general-purpose precision bearing in the NMT 7014 series – offering the perfect balance of high load capacity, ultra-high speed, and ultra-precision performance.

 

Choose NMT 7014 CE/P4A for:

 

✅ 15° contact angle + E-type high-speed design – 27,000 r/min oil-air lubrication limiting speed

 

✅ P4A super-precision running accuracy – bore tolerance -0.007 mm to 0

 

✅ 23.8 kN high load capacity

 

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

 

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

 

✅ Open design – flexible lubrication options

 

✅ Single-row design – flexible adaptation to various spindle configurations