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
QJ226
130
230
40
3
300000
635000
2200
3000
QJ336
180
380
75
4
655000
1770000
1300
1800
QJ326
130
280
58
4
440000
970000
1900
2600
QJ1038
190
290
46
2.1
355000
925000
1600
2200
QJ1028
140
210
33
2
190000
435000
2200
3000
QJ238
190
340
55
4
480000
1290000
1400
2000
QJ228
140
250
42
3
350000
775000
2000
2800
QJ338
190
400
78
5
720000
1980000
1300
1700
QJ306
30
72
19
1.1
51000
63000
8000
11000
QJ314
70
150
35
2.1
189000
285000
3600
5000
QJ220
100
180
34
2.1
219000
390000
2800
3800
QJ207
35
72
17
1.1
45000
61500
7500
10000
QJ215
75
130
25
1.5
121000
212000
3800
5300
QJ320
100
215
47
3
335000
640000
2400
3400
QJ307
35
80
21
1.5
60500
80000
7100
9500
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