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
NN4930MBKR
150
210
60
2
405
715
4200
5000
NN3024TB
120
180
46
2
275
405
5700
6700
NN3928MB
140
190
37
1.5
232
375
4600
5500
NN3024TBKR
120
180
46
2
275
405
5700
6700
NN3928MBKR
140
190
37
1.5
232
375
4600
5500
NN3024ZTB
120
180
46
2
164
203
6000
7900
NN4928MB
140
190
50
1.5
325
585
4600
5500
NN3024ZTBKR
120
180
46
2
164
203
6000
7900
NN4928MBKR
140
190
50
1.5
325
585
4600
5500
NN3926MB
130
180
37
1.5
199
325
4900
5900
NNU4928MB
140
190
50
1.5
325
585
4600
5500
NN3926MBKR
130
180
37
1.5
199
325
4900
5900
NNU4928MBKR
140
190
50
1.5
325
585
4600
5500
NN4926MB
130
180
50
1.5
315
545
4900
5900
NN3028MB
140
210
53
2
345
515
4300
5200
NN4926MBKR
130
180
50
1.5
315
545
4900
5900
NN3028MBKR
140
210
53
2
345
515
4300
5200
NN3924MB
120
165
34
1.1
158
251
5300
6400
NNU4926MB
130
180
50
1.5
315
545
4900
5900
NN3028TB
140
210
53
2
345
515
4900
5700
NN3924MBKR
120
165
34
1.1
158
251
5300
6400
NNU4926MBKR
130
180
50
1.5
315
545
4900
5900
NN3028TBKR
140
210
53
2
345
515
4900
5700
NN4924MB
120
165
45
1.1
211
360
5300
6400