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
QJ334
170
360
72
4
620000
1610000
1400
2000
QJ234
170
310
52
4
470000
1180000
1600
2200
QJ1034
170
260
42
2.1
295000
705000
1800
2400
QJ232
160
290
48
3
420000
1010000
1700
2400
QJ320
100
215
47
3
335000
640000
2400
3400
QJ222
110
200
38
2.1
259000
490000
2600
3400
QJ1022
110
170
28
2
153000
315000
2800
3800
QJ321
105
225
49
3
335000
640000
2400
3200
QJ221
105
190
36
2.1
239000
435000
2600
3600
QJ1021
105
160
26
2
127000
269000
3000
4000
QJ210
50
90
20
1.1
63000
97000
5600
8000
QJ214
70
125
24
1.5
117000
197000
4000
5600
QJ313
65
140
33
2.1
168000
250000
3800
5300
QJ213
65
120
23
1.5
107000
179000
4300
6000
QJ312
60
130
31
2.1
148000
217000
4300
5600
QJ212
60
110
22
1.5
94000
150000
4800
6300
QJ311
55
120
29
2
130000
187000
4500
6300
QJ211
55
100
21
1.5
78000
122000
5300
7100
QJ310
50
110
27
2
112000
159000
5000
6700
QJ314
70
150
35
2.1
189000
285000
3600
5000
QJ309
45
100
25
1.5
96000
133000
5600
7500
QJ209
45
85
19
1.1
60000
88500
6300
8500
QJ308
40
90
23
1.5
74000
100000
6300
8500
QJ208
40
80
18
1.1
53500
77500
6700
9000