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
7210A5SN24
50
90
20
1.1
0.6
52.0
29.3
17900
26900
7008CSN24
40
68
15
1
0.6
25.8
15.1
27800
42300
7209A5
45
85
19
1.1
0.6
49.0
27.6
15400
23100
7210C
50
90
20
1.1
0.6
54.0
31.5
16500
25000
7208A
40
80
18
1.1
0.6
42.5
23.4
12500
16700
7209A5SN24
45
85
19
1.1
0.6
49.5
26.6
20000
30000
7210CSN24
50
90
20
1.1
0.6
54.5
30.5
20600
31300
7208A5
40
80
18
1.1
0.6
44.0
24.1
16700
25000
7209C
45
85
19
1.1
0.6
51.5
28.8
17700
27000
7911A5
55
80
13
1
0.6
22.8
16.8
14900
22300
7208A5SN24
40
80
18
1.1
0.6
44.0
23.1
21700
32500
7209CSN24
45
85
19
1.1
0.6
51.5
27.8
23100
35100
7911A5SN24
55
80
13
1
0.6
23.1
16.4
19300
28900
7208C
40
80
18
1.1
0.6
46.0
25.2
19200
29200
7910A5
50
72
12
0.6
0.3
20.1
14.2
16400
24600
7911C
55
80
13
1
0.6
24.1
17.7
17100
26000
7208CSN24
40
80
18
1.1
0.6
46.0
24.2
25000
38000
7910A5SN24
50
72
12
0.6
0.3
20.0
13.5
21400
32000
7911CSN24
55
80
13
1
0.6
24.5
17.3
22300
33800
7909A5
45
68
12
0.6
0.3
19.1
12.7
17700
26600
7910C
50
72
12
0.6
0.3
21.3
15.0
18900
28700
7011A
55
90
18
1.1
0.6
39.0
26.3
10400
13800
7206A5SN24
30
62
16
1
0.6
27.9
13.6
28300
42400
7207CSN24
35
72
17
1.1
0.6
38.0
19.0
28100
42700