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**.

MORE +
CLOSE +
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
7220A5
100
180
34
2.1
1.1
179
121
7200
10800
7220C
100
180
34
2.1
1.1
188
127
8300
12500
7921A5
105
145
20
1.1
0.6
60.5
54.0
8000
12000
7921A5SN24
105
145
20
1.1
0.6
61.0
51.5
10400
15600
7921C
105
145
20
1.1
0.6
64.5
57.0
9200
14000
7921CSN24
105
145
20
1.1
0.6
64.5
54.5
12000
18300
7021A
105
160
26
2
1
101
81.5
5700
7600
7021A5
105
160
26
2
1
105
85.0
7600
11400
7021A5SN24
105
160
26
2
1
105
81.0
9900
14800
7021C
105
160
26
2
1
111
89.5
8700
13300
7021CSN24
105
160
26
2
1
111
85.5
11400
17300
7221A
105
190
36
2.1
1.1
188
132
5100
6800
7221A5
105
190
36
2.1
1.1
195
137
6800
10200
7221C
105
190
36
2.1
1.1
205
143
7800
11900
7922A5
110
150
20
1.1
0.6
62.0
56.0
7700
11600
7922A5SN24
110
150
20
1.1
0.6
62.0
54.0
10000
15000
7922C
110
150
20
1.1
0.6
65.5
59.5
8900
13500
7922CSN24
110
150
20
1.1
0.6
65.5
57.0
11600
17600
7022A
110
170
28
2
1
122
95.5
5400
7200
7022A5
110
170
28
2
1
127
99.0
7200
10800
7022A5SN24
110
170
28
2
1
126
94.0
9300
14000
7022C
110
170
28
2
1
134
104
8300
12500
7022CSN24
110
170
28
2
1
133
99.0
10800
16300
7222A
110
200
38
2.1
1.1
204
148
4900
6500