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
55BNR10H
55
90
18
1.1
0.6
19.0
12.0
24900
38700
55BNR10X
55
90
18
1.1
0.6
30.0
12.0
29000
45600
55BNRD10J
55
90
18
1.1
0.6
37.5
14.5
24900
38700
55BNRD10X
55
90
18
1.1
0.6
47.5
14.5
29000
45600
55BER20EV1V
55
90
22
1.1
0.6
18.1
12.0
17800
55BER20HV1V
55
90
22
1.1
0.6
18.1
11.5
22100
55BER20XV1V
55
90
22
1.1
0.6
28.8
11.5
26300
55BNR20EV1V
55
90
22
1.1
0.6
19.0
12.5
20700
55BNR20HV1V
55
90
22
1.1
0.6
19.0
12.0
24900
55BNR20XV1V
55
90
22
1.1
0.6
30.0
12.0
29000
60BER19E
60
85
13
1
0.6
17.6
11.5
17800
25200
60BER19H
60
85
13
1
0.6
17.6
11.0
22100
34500
60BER19X
60
85
13
1
0.6
27.9
11.0
26300
41400
60BNR19E
60
85
13
1
0.6
18.4
12.0
20700
29600
60BNR19H
60
85
13
1
0.6
18.4
11.5
24900
38700
60BNR19X
60
85
13
1
0.6
29.2
11.5
29000
45600
60BER29EV1V
60
85
16
1
0.6
17.6
11.5
17800
60BER29HV1V
60
85
16
1
0.6
17.6
11.0
22100
60BER29XV1V
60
85
16
1
0.6
27.9
11.0
26300
60BNR29EV1V
60
85
16
1
0.6
18.4
12.0
20700
60BNR29HV1V
60
85
16
1
0.6
18.4
11.5
24900
60BNR29XV1V
60
85
16
1
0.6
29.2
11.5
29000
60BER10E
60
95
18
1.1
0.6
18.8
13.1
16700
23500
60BER10H
60
95
18
1.1
0.6
18.8
12.5
20700
32300