ROBUST Series Ultra High-Speed Angular Contact Ball Bearings

**Introduction to NSK Super Precision Bearings: ROBUST Series Ultra High Speed Angular Contact Ball Bearings**

In the demanding world of high-speed, high-precision motion control, NSK’s **Super Precision Angular Contact Ball Bearings—ROBUST Series** stand out as a benchmark for reliability, speed, and accuracy. Engineered to meet the rigorous requirements of advanced industrial machinery, automotive systems, and precision equipment, these ultra-high-speed bearings deliver exceptional performance under extreme operating conditions.

### **Technical Features & Design Innovations**
The **ROBUST Series** incorporates cutting-edge design elements to optimize performance in high-speed applications:

– **Advanced Materials & Heat Treatment:** Manufactured from premium-grade steel and subjected to specialized heat treatment processes, these bearings exhibit superior hardness, fatigue resistance, and durability, even under heavy loads and high rotational speeds.
– **Optimized Internal Geometry:** Precision-machined raceways and ball profiles minimize friction and heat generation, ensuring smooth operation at ultra-high speeds (reaching **dn values exceeding 2 million**).
– **Enhanced Cage Designs:** High-strength polymer or lightweight alloy cages reduce centrifugal forces, preventing slippage and maintaining stability at extreme RPMs.
– **Sealing & Lubrication Options:** Customizable sealing solutions and advanced grease formulations extend service life while reducing maintenance needs in contaminated or high-temperature environments.

### **Performance Advantages**
NSK’s **ROBUST Series** bearings excel in critical performance metrics:

– **Ultra-High Speed Capability:** Designed for spindle and rotor applications, these bearings minimize vibration and heat buildup, enabling stable operation in CNC machine tools, turbochargers, and electric vehicle motors.
– **Rigidity & Load Capacity:** Angular contact design supports combined radial and axial loads, making them ideal for applications requiring high stiffness, such as robotics, aerospace actuators, and semiconductor manufacturing equipment.
– **Extended Service Life:** Reduced wear and optimized lubrication contribute to longer operational lifespans, lowering total cost of ownership for industrial users.
– **Noise & Vibration Reduction:** Precision tolerances (ABEC 7/P4 or higher) ensure quiet, smooth rotation, critical for medical imaging devices and high-end automation systems.

### **Typical Applications**
The **ROBUST Series** is deployed across industries where precision and speed are non-negotiable:

– **Industrial Machinery:** High-speed spindles in CNC machining centers, grinding machines, and lathes.
– **Automotive Systems:** Turbocharger shafts, hybrid/electric vehicle drivetrains, and performance transmission systems.
– **Precision Equipment:** Robotics, optical positioning stages, and aerospace gyroscopes.

By combining **NSK’s decades of super-precision engineering** with robust materials and innovative design, the **ROBUST Series** ensures unmatched performance for the most challenging motion control applications. Whether in high-speed manufacturing or cutting-edge automotive tech, these bearings provide the reliability and precision needed to push technological boundaries.

For industries where failure is not an option, NSK’s **Super Precision Angular Contact Ball Bearings** deliver speed, accuracy, and endurance—engineered for the future of motion.

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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
20BSR19H
20
37
9
0.3
0.15
5.95
2.05
66700
98300
25BSR02S
25
52
15
1
0.6
14.0
5.20
41600
57200
30BNR10S
30
55
13
1
0.6
10.9
5.75
33000
47100
10BSR10X
10
26
8
0.3
0.15
6.05
1.13
123000
167000
15BSR10H
15
32
9
0.3
0.15
5.25
1.65
80900
120000
10BSR02H
10
30
9
0.6
0.3
4.85
1.41
95000
140000
15BSR10S
15
32
9
0.3
0.15
5.30
1.72
68100
93700
6BSR10H
6
17
6
0.3
0.15
1.71
0.425
166000
244000
10BSR02S
10
30
9
0.6
0.3
4.85
1.48
80000
110000
15BSR10X
15
32
9
0.3
0.15
8.35
1.65
93700
128000
6BSR10S
6
17
6
0.3
0.15
1.70
0.445
140000
192000
10BSR02X
10
30
9
0.6
0.3
7.70
1.41
110000
150000
15BSR02H
15
35
11
0.6
0.3
7.30
2.24
76000
112000
6BSR10X
6
17
6
0.3
0.15
2.71
0.425
192000
261000
12BSR19H
12
24
6
0.3
0.15
2.46
0.815
106000
156000
15BSR02S
15
35
11
0.6
0.3
7.30
2.34
64000
88000
7BSR10H
7
19
6
0.3
0.15
1.98
0.545
147000
216000
12BSR19S
12
24
6
0.3
0.15
2.46
0.850
88900
123000
15BSR02X
15
35
11
0.6
0.3
11.6
2.24
88000
120000
7BSR10S
7
19
6
0.3
0.15
1.98
0.570
124000
170000