Four-Point Contact Ball Bearings

**Precision in Motion: NSK’s Advanced Ball Bearing Solutions for Demanding Applications**

In industries where precision, reliability, and efficiency are non-negotiable, NSK’s high-performance ball bearings stand as a cornerstone of motion control technology. Designed to meet the rigorous demands of industrial machinery, automotive systems, and precision equipment, NSK’s angular contact ball bearings and four-point contact ball bearings deliver exceptional load capacity, rigidity, and operational longevity. These bearings are engineered to optimize performance in applications requiring high-speed rotation, axial and radial load support, and minimal friction—ensuring smooth, precise motion even under extreme conditions.

### **Technical Excellence and Performance Advantages**

**Angular Contact Ball Bearings**
NSK’s angular contact ball bearings are precision-engineered to handle combined radial and axial loads, making them ideal for applications where high rotational accuracy and rigidity are critical. Their unique contact angle design allows them to support unidirectional thrust loads while maintaining low friction and high-speed capability. Key features include:
– **Optimized Contact Angles (15°, 25°, 30°, or 40°)** – Tailored to specific load and speed requirements.
– **Enhanced Rigidity and Precision** – Ideal for machine tool spindles, robotics, and high-speed motors.
– **Advanced Cage Designs** – Reduce friction and wear, extending service life.
– **Sealed and Lubricated Options** – For contamination resistance in harsh environments.

**Four-Point Contact Ball Bearings**
NSK’s four-point contact ball bearings are designed to accommodate axial loads in both directions while also handling moderate radial loads—making them a versatile solution for compact, high-efficiency designs. Their unique raceway geometry ensures optimal load distribution, reducing stress and wear. Key benefits include:
– **Bidirectional Axial Load Support** – Eliminates the need for paired bearing arrangements.
– **Space-Saving Design** – Reduces system complexity and weight.
– **High-Speed Performance** – Low friction and heat generation enhance efficiency.
– **Robust Construction** – Suitable for turntables, robotics, and aerospace applications.

### **Applications Across Industries**
NSK’s precision ball bearings are integral to a wide range of high-performance systems:
– **Industrial Machinery** – Machine tool spindles, CNC equipment, and automation systems benefit from high rigidity and accuracy.
– **Automotive Systems** – Electric power steering, transmissions, and wheel hubs rely on durable, low-friction bearings.
– **Precision Equipment** – Medical devices, semiconductor manufacturing, and robotics demand ultra-smooth motion control.

By combining advanced materials, precision manufacturing, and innovative design, NSK ensures that its bearings deliver unmatched performance, durability, and efficiency—helping industries push the boundaries of motion control technology. Whether in high-speed automation or heavy-load industrial applications, NSK’s bearings provide the reliability needed to keep systems running at peak performance.

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Designations Nominal Dimensions Basic Load Ratings Speeds
Limiting Speeds
d
mm
D
mm
B
mm
r(min.)
mm
Ca
N
C0a
N
Grease
min-1
Oil (Oil-bath)
min-1
QJ315
75
160
37
2.1
206000
320000
3400
4800
QJ1021
105
160
26
2
127000
269000
3000
4000
QJ208
40
80
18
1.1
53500
77500
6700
9000
QJ1016
80
125
22
1.1
84500
167000
3800
5300
QJ221
105
190
36
2.1
239000
435000
2600
3600
QJ308
40
90
23
1.5
74000
100000
6300
8500
QJ216
80
140
26
2
136000
236000
3600
5000
QJ321
105
225
49
3
335000
640000
2400
3200