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
17BSR19X
17
30
7
0.3
0.15
6.45
1.47
93700
128000
8BSR10S
8
22
7
0.3
0.15
2.91
0.835
107000
147000
12BSR10X
12
28
8
0.3
0.15
6.45
1.27
110000
150000
17BSR10H
17
35
10
0.3
0.15
5.60
1.85
73100
108000
8BSR10X
8
22
7
0.3
0.15
4.60
0.800
147000
200000
12BSR02H
12
32
10
0.6
0.3
6.40
1.89
86400
128000
10BSR19H
10
22
6
0.3
0.15
2.24
0.685
119000
175000
12BSR02S
12
32
10
0.6
0.3
6.40
1.98
72800
100000
10BSR19S
10
22
6
0.3
0.15
2.24
0.715
100000
138000
12BSR02X
12
32
10
0.6
0.3
10.1
1.89
100000
137000
10BSR19X
10
22
6
0.3
0.15
3.55
0.685
138000
188000
15BSR19H
15
28
7
0.3
0.15
3.75
1.26
88400
131000
10BSR10H
10
26
8
0.3
0.15
3.80
1.13
106000
156000
15BSR19S
15
28
7
0.3
0.15
3.75
1.31
74500
103000
10BSR10S
10
26
8
0.3
0.15
3.80
1.18
88900
123000
15BSR19X
15
28
7
0.3
0.15
5.90
1.26
103000
140000
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