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
7003CSN24
17
35
10
0.3
0.15
8.20
3.55
57700
87700
7203A
17
40
12
0.6
0.3
12.8
5.45
26400
35100
7203A5
17
40
12
0.6
0.3
13.2
5.60
35100
52700
7203A5SN24
17
40
12
0.6
0.3
13.1
5.35
45700
68500
7203C
17
40
12
0.6
0.3
13.7
5.85
40400
61500
7203CSN24
17
40
12
0.6
0.3
13.6
5.55
52700
80000
7904A5
20
37
9
0.3
0.15
8.30
4.05
35100
52700
7904A5SN24
20
37
9
0.3
0.15
8.20
3.80
45700
68500
7904C
20
37
9
0.3
0.15
8.75
4.25
40400
61500
7904CSN24
20
37
9
0.3
0.15
8.60
3.95
52700
80000
7004A
20
42
12
0.6
0.3
13.0
6.10
24200
32300
7004A5
20
42
12
0.6
0.3
13.4
6.25
32300
48400
7004A5SN24
20
42
12
0.6
0.3
13.5
6.05
42000
63000
7004C
20
42
12
0.6
0.3
14.0
6.55
37100
56500
7004CSN24
20
42
12
0.6
0.3
14.1
6.30
48400
73600
7204A
20
47
14
1
0.6
17.1
7.55
22400
29900
7204A5
20
47
14
1
0.6
17.6
7.75
29900
44800
7204A5SN24
20
47
14
1
0.6
17.5
7.35
38900
58300
7204C
20
47
14
1
0.6
18.3
8.05
34400
52300
7204CSN24
20
47
14
1
0.6
18.2
7.65
44800
68100
7905A5
25
42
9
0.3
0.15
9.35
5.15
29900
44800
7905A5SN24
25
42
9
0.3
0.15
9.20
4.80
38900
58300
7905C
25
42
9
0.3
0.15
9.90
5.40
34400
52300
7905CSN24
25
42
9
0.3
0.15
9.75
5.05
44800
68100