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
65BNR10H
65
100
18
1.1
0.6
20.4
14.2
21900
34000
65BNR10X
65
100
18
1.1
0.6
32.5
14.2
25500
40000
65BNRD10J
65
100
18
1.1
0.6
41.0
17.3
21900
34000
65BNRD10X
65
100
18
1.1
0.6
52.0
17.3
25500
40000
65BER20EV1V
65
100
22
1.1
0.6
19.5
14.2
15700
65BER20HV1V
65
100
22
1.1
0.6
19.5
13.6
19400
65BER20XV1V
65
100
22
1.1
0.6
31.0
13.6
23100
65BNR20EV1V
65
100
22
1.1
0.6
20.4
14.8
18200
65BNR20HV1V
65
100
22
1.1
0.6
20.4
14.2
21900
65BNR20XV1V
65
100
22
1.1
0.6
32.5
14.2
25500
70BER19E
70
100
16
1
0.6
25.7
17.3
15200
21500
70BER19H
70
100
16
1
0.6
25.7
16.6
18900
29500
70BER19X
70
100
16
1
0.6
41.0
16.6
22400
35300
70BNR19E
70
100
16
1
0.6
26.8
18.1
17700
25200
70BNR19H
70
100
16
1
0.6
26.8
17.3
21200
33000
55BNR29EV1V
55
80
16
1
0.6
18.1
11.4
22300
55BNR29HV1V
55
80
16
1
0.6
18.1
10.9
26700
55BNR29XV1V
55
80
16
1
0.6
28.8
10.9
31200
55BER10E
55
90
18
1.1
0.6
18.1
12.0
17800
25200
55BER10H
55
90
18
1.1
0.6
18.1
11.5
22100
34500
55BER10X
55
90
18
1.1
0.6
28.8
11.5
26300
41400
55BERD10J
55
90
18
1.1
0.6
36.0
13.9
22100
34500
55BERD10X
55
90
18
1.1
0.6
45.5
13.9
26300
41400
55BNR10E
55
90
18
1.1
0.6
19.0
12.5
20700
29600