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
7005A
25
47
12
0.6
0.3
13.5
6.85
20900
27800
7005A5
25
47
12
0.6
0.3
14.0
7.10
27800
41700
7005A5SN24
25
47
12
0.6
0.3
14.1
6.85
36200
54200
7005C
25
47
12
0.6
0.3
14.7
7.40
32000
48700
7005CSN24
25
47
12
0.6
0.3
14.8
7.15
41700
63400
7205A
25
52
15
1
0.6
19.4
9.45
19500
26000
7900A5
10
22
6
0.3
0.15
3.65
1.45
62500
93800
7900A5SN24
10
22
6
0.3
0.15
3.65
1.40
81300
122000
7900C
10
22
6
0.3
0.15
3.80
1.52
71900
109000
7900CSN24
10
22
6
0.3
0.15
3.80
1.46
93800
143000
7000A
10
26
8
0.3
0.15
6.30
2.34
41700
55600
7000A5
10
26
8
0.3
0.15
6.50
2.41
55600
83400
7000A5SN24
10
26
8
0.3
0.15
6.40
2.25
72300
108000
7000C
10
26
8
0.3
0.15
6.70
2.49
63900
97300
7000CSN24
10
26
8
0.3
0.15
6.60
2.33
83400
127000
7200A
10
30
9
0.6
0.3
6.35
2.44
37500
50000
7200A5
10
30
9
0.6
0.3
6.55
2.51
50000
75000
7200A5SN24
10
30
9
0.6
0.3
6.45
2.35
65000
97500
7200C
10
30
9
0.6
0.3
6.80
2.61
57500
87500
7200CSN24
10
30
9
0.6
0.3
6.70
2.44
75000
114000
7901A5
12
24
6
0.3
0.15
4.05
1.77
55600
83400
7901A5SN24
12
24
6
0.3
0.15
4.05
1.71
72200
108000
7901C
12
24
6
0.3
0.15
4.25
1.86
63900
97300
7901CSN24
12
24
6
0.3
0.15
4.25
1.79
83300
127000