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
7213C
65
120
23
1.5
1
92.0
58.5
12500
19000
7211A
55
100
21
1.5
1
61.5
37.0
9700
13000
7212A5SN24
60
110
22
1.5
1
76.5
44.5
15300
23000
7213CSN24
65
120
23
1.5
1
92.0
56.0
16300
24700
7211A5
55
100
21
1.5
1
63.5
38.0
13000
19400
7212C
60
110
22
1.5
1
80.5
49.0
13600
20600
7914A5
70
100
16
1
0.6
33.5
26.3
11800
17700
7211A5SN24
55
100
21
1.5
1
63.5
36.5
16800
25200
7212CSN24
60
110
22
1.5
1
80.0
46.5
17700
26900
7914A5SN24
70
100
16
1
0.6
33.5
25.2
15300
23000
7211C
55
100
21
1.5
1
66.5
40.0
14900
22600
7913A5
65
90
13
1
0.6
24.0
19.4
13000
19400
7914C
70
100
16
1
0.6
35.5
27.8
13600
20600
7211CSN24
55
100
21
1.5
1
66.5
38.0
19400
29500
7913A5SN24
65
90
13
1
0.6
24.4
19.0
16800
25200
7914CSN24
70
100
16
1
0.6
35.5
26.6
17700
26900
7912A5
60
85
13
1
0.6
23.1
17.7
13800
20700
7913C
65
90
13
1
0.6
25.5
20.5
14900
22600
7912A5SN24
60
85
13
1
0.6
23.4
17.3
18000
26900
7913CSN24
65
90
13
1
0.6
25.9
20.1
19400
29500
7912C
60
85
13
1
0.6
24.5
18.7
15900
24200
7013A
65
100
18
1.1
0.6
42.5
31.5
9100
12200
7912CSN24
60
85
13
1
0.6
24.8
18.3
20700
31500
7013A5
65
100
18
1.1
0.6
44.0
32.5
12200
18200