Standard Series High Precision Angular Contact Ball Bearings

**Introduction to NSK Super Precision Angular Contact Ball Bearings – Standard Series**

In the realm of high-performance motion control, precision is paramount. NSK’s **Super Precision Angular Contact Ball Bearings (Standard Series)** represent the pinnacle of engineering excellence, delivering unmatched accuracy, rigidity, and reliability for demanding applications across industries. Designed to meet the exacting requirements of advanced machinery, automotive systems, and precision equipment, these bearings combine cutting-edge materials, meticulous manufacturing tolerances, and optimized geometries to ensure superior performance in high-speed, high-load, and ultra-precise environments.

### **Technical Features & Design Innovations**
NSK’s **Standard Series Super Precision Angular Contact Ball Bearings** are engineered with a focus on minimizing friction, reducing heat generation, and maintaining dimensional stability under extreme operating conditions. Key features include:

– **Ultra-Precise Raceway Grinding:** Advanced grinding techniques ensure raceway surfaces with minimal form error, enhancing rotational accuracy and smooth motion.
– **Optimized Contact Angles (15° & 25°):** The bearings are available in multiple contact angle configurations, allowing engineers to select the ideal balance between axial and radial load capacity.
– **High-Grade Materials:** Manufactured from premium bearing steel (or optional ceramic hybrid options), these bearings resist wear, fatigue, and thermal deformation.
– **Preloaded Options:** Matched bearing sets with controlled preload minimize axial and radial play, improving rigidity for applications requiring zero backlash.
– **Special Cage Designs:** Glass fiber-reinforced polyamide (PA66) or machined brass cages reduce friction, dampen vibration, and extend service life.

### **Performance Advantages**
NSK’s Super Precision Angular Contact Ball Bearings excel where conventional bearings fall short, offering:

– **Exceptional Rotational Accuracy:** Achieve runout tolerances as low as **1 μm** or less, critical for spindle motors, CNC machines, and optical systems.
– **High-Speed Capability:** Advanced lubrication and cage designs enable stable operation at **DN values exceeding 1.5 million** (mm·rpm).
– **Enhanced Rigidity & Load Capacity:** The optimized internal geometry distributes loads evenly, reducing deformation under heavy axial/radial forces.
– **Long Service Life:** Precision manufacturing and superior materials reduce wear, even in contaminated or high-temperature environments.

### **Typical Applications**
These bearings are indispensable in industries where precision and reliability are non-negotiable:

– **Machine Tools:** High-speed spindles, CNC machining centers, and grinding machines rely on NSK bearings for micron-level accuracy.
– **Automotive Systems:** Turbochargers, electric vehicle (EV) motor shafts, and steering systems benefit from low friction and high durability.
– **Robotics & Automation:** Articulated arms, rotary tables, and linear actuators demand the rigidity and repeatability of NSK’s precision bearings.
– **Aerospace & Medical Equipment:** From aircraft gyroscopes to MRI scanners, these bearings ensure smooth, vibration-free motion.

### **Conclusion**
NSK’s **Super Precision Angular Contact Ball Bearings (Standard Series)** set the benchmark for performance in precision motion control. By integrating advanced materials, exacting manufacturing standards, and innovative design, they empower engineers to push the boundaries of speed, accuracy, and reliability in the most challenging applications. Whether in industrial automation, high-performance automotive systems, or cutting-edge medical devices, NSK’s bearings deliver the precision that drives progress.

For mission-critical applications where failure is not an option, NSK’s Super Precision Bearings provide the confidence of **engineered perfection**.

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Designations Nominal Dimensions Basic Load Ratings Speeds
Limiting Speeds
d
mm
D
mm
B
mm
r(min.)
mm
r1(min.)
mm
Cr
kN
C0r
kN
Grease
min-1
Oil (Oil-air)
min-1
7028A5SN24
140
210
33
2
1
157
132
7500
11200
7028C
140
210
33
2
1
166
145
6600
10000
7028CSN24
140
210
33
2
1
167
139
8600
13100
7228A
140
250
42
3
1.1
275
234
3900
5200
7228A5
140
250
42
3
1.1
285
242
5200
7700
7228C
140
250
42
3
1.1
300
254
5900
9000
7930A5
150
210
28
2
1
121
115
5600
8400
7930A5SN24
150
210
28
2
1
121
110
7300
10900
7930C
150
210
28
2
1
129
122
6400
9800
7930CSN24
150
210
28
2
1
129
117
8400
12700
7030A
150
225
35
2.1
1.1
172
154
4000
5400
7030A5
150
225
35
2.1
1.1
180
160
5400
8000
7030A5SN24
150
225
35
2.1
1.1
179
152
7000
10400
7030C
150
225
35
2.1
1.1
190
168
6200
9400
7920A5
100
140
20
1.1
0.6
59.5
51.5
8400
12500
7920A5SN24
100
140
20
1.1
0.6
60.0
49.5
10900
16300
7920C
100
140
20
1.1
0.6
63.0
54.0
9600
14600
7920CSN24
100
140
20
1.1
0.6
63.5
52.0
12500
19000
7020A
100
150
24
1.5
1
86.0
70.5
6000
8000
7020A5
100
150
24
1.5
1
89.5
73.5
8000
12000
7020A5SN24
100
150
24
1.5
1
90.0
70.5
10400
15600
7020C
100
150
24
1.5
1
95.0
77.0
9200
14000
7020CSN24
100
150
24
1.5
1
95.0
74.0
12000
18300
7220A
100
180
34
2.1
1.1
173
117
5400
7200