Double-Row Cylindrical Roller Bearings

**NSK Super Precision Bearings: Engineered for Unmatched Accuracy and Performance**

In the world of high-precision motion and control, NSK’s **Super Precision Bearings** stand as a benchmark for reliability, rigidity, and ultra-low friction performance. Among these, the **Super Precision Cylindrical Roller Bearings** and **Double Row Cylindrical Roller Bearings** are engineered to meet the most demanding applications—delivering exceptional rotational accuracy, high load capacity, and extended service life in industries where precision is non-negotiable.

### **Technical Excellence and Design Innovations**
NSK’s **Super Precision Cylindrical Roller Bearings** are designed with optimized roller profiles, precision-ground raceways, and advanced materials to minimize vibration, heat generation, and wear. These bearings feature:
– **Ultra-High Precision (P4, P2, or higher grades)** – Ensuring minimal runout and consistent performance in high-speed applications.
– **Enhanced Load Capacity** – Radial load handling is maximized through superior roller-to-raceway contact, making them ideal for heavy-duty machining and automation.
– **Low Friction & High-Speed Capability** – Special cage designs (e.g., brass or polymer cages) reduce friction, allowing for smoother operation at elevated speeds.

For applications requiring even greater rigidity and load distribution, NSK’s **Double Row Cylindrical Roller Bearings** provide:
– **Increased Radial Stiffness** – Two rows of rollers enhance stability, critical for machine tool spindles and high-precision gearboxes.
– **Optimized Internal Geometry** – Precision alignment minimizes deflection under heavy loads, maintaining accuracy in dynamic conditions.
– **Sealed or Open Configurations** – Options for grease lubrication or integrated sealing solutions extend maintenance intervals in harsh environments.

### **Performance Advantages for Critical Applications**
NSK’s super precision cylindrical roller bearings excel in environments where even micron-level deviations can impact performance. Key advantages include:
– **Extended Service Life** – Advanced heat treatment and surface finishing techniques reduce wear, ensuring longevity even under continuous high-load operation.
– **Reduced Noise & Vibration** – Critical for semiconductor manufacturing, medical imaging equipment, and high-end robotics.
– **Thermal Stability** – Engineered to maintain dimensional stability under thermal fluctuations, crucial for CNC machining and aerospace components.

### **Typical Applications Across Industries**
These bearings are indispensable in sectors demanding the highest levels of precision and durability:
– **Industrial Machinery** – Machine tool spindles, robotic arms, and printing presses rely on their rigidity and speed capabilities.
– **Automotive Systems** – High-performance transmissions, electric vehicle (EV) drivetrains, and turbochargers benefit from their low friction and high-load support.
– **Precision Equipment** – Medical imaging devices, optical alignment systems, and semiconductor wafer handling require the near-zero runout provided by NSK’s super precision designs.

By combining cutting-edge engineering with decades of expertise, NSK’s **Super Precision Cylindrical Roller Bearings** and **Double Row Cylindrical Roller Bearings** set the standard for motion control in the most demanding applications—ensuring efficiency, accuracy, and reliability where it matters most.

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Designations Nominal Dimensions Basic Load Ratings Speeds
Limiting Speeds
d
mm
D
mm
B
mm
r(min.)
mm
Cr
kN
C0r
kN
Grease
min-1
Oil (Oil-air)
min-1
NN39/530
530
710
136
5
2040
4900
900
1200
NN49/630
630
850
218
6
4200
11400
800
1000
NN39/530K
530
710
136
5
2040
4900
900
1200
NN49/630K
630
850
218
6
4200
11400
800
1000
NN49/530
530
710
180
5
3050
8150
900
1200
NNU49/630
630
850
218
6
4200
11400
800
1000
NN49/530K
530
710
180
5
3050
8150
900
1200
NNU49/630K
630
850
218
6
4200
11400
800
1000
NNU49/530
530
710
180
5
3050
8150
900
1200
NN49/670
670
900
230
6
4150
11500
700
900
NNU49/530K
530
710
180
5
3050
8150
900
1200
NN49/670K
670
900
230
6
4150
11500
700
900
NN30/530
530
780
185
6
3200
6900
900
1100
NNU49/670
670
900
230
6
4150
11500
700
900
NN30/530K
530
780
185
6
3200
6900
900
1100
NNU49/670K
670
900
230
6
4150
11500
700
900
NN49/560
560
750
190
5
3250
8700
900
1100
NNU49/710B
710
950
243
6
4450
12600
700
900
NN49/560K
560
750
190
5
3250
8700
900
1100
NNU49/710BK
710
950
243
6
4450
12600
700
900