Double-Row Cylindrical Roller Bearings

**Introduction to NSK’s Double Row Cylindrical Roller Bearings: Precision, Performance, and Reliability**

In the demanding world of industrial machinery, automotive systems, and precision equipment, the performance and durability of rotating components are critical to operational success. NSK, a global leader in motion and control technologies, offers a superior solution with its **Double Row Cylindrical Roller Bearings**—engineered to deliver unmatched load capacity, rigidity, and precision in even the most challenging applications.

### **Technical Features & Design Excellence**
NSK’s **Double Row Cylindrical Roller Bearings** are designed with advanced engineering to optimize load distribution and minimize friction. Key features include:

– **High Load Capacity:** The double-row arrangement of precision-ground rollers significantly increases radial load capacity compared to single-row designs, making them ideal for heavy-duty applications.
– **Enhanced Rigidity:** A robust cage design ensures proper roller alignment, reducing deflection under high loads and improving system stability.
– **Low Friction & Heat Generation:** Optimized roller profiles and high-quality steel materials minimize energy loss, extending bearing life and reducing maintenance needs.
– **Precision Tolerance:** Manufactured to exacting ISO standards, these bearings provide consistent performance in high-speed and high-precision environments.
– **Versatile Configurations:** Available in various designs, including **NU, NN, and NNU types**, to accommodate different mounting requirements and operational demands.

### **Performance Advantages for Industrial & Automotive Applications**
NSK’s Double Row Cylindrical Roller Bearings excel in applications where reliability and precision are non-negotiable:

– **Industrial Machinery:** Used in machine tools, gearboxes, and rolling mills, these bearings ensure smooth operation under heavy radial loads and high rotational speeds.
– **Automotive Systems:** In transmissions, wheel hubs, and electric vehicle drivetrains, they provide the durability needed for long service life and reduced downtime.
– **Precision Equipment:** Critical in robotics, medical devices, and aerospace systems, where minimal vibration and high positional accuracy are essential.

### **Why Choose NSK?**
With over a century of expertise in bearing technology, NSK combines **advanced materials, precision manufacturing, and rigorous testing** to deliver bearings that outperform industry standards. Whether in extreme temperatures, contaminated environments, or high-speed operations, NSK’s Double Row Cylindrical Roller Bearings provide **longer service life, reduced energy consumption, and enhanced operational efficiency.**

For engineers and designers seeking a reliable, high-performance bearing solution, NSK’s Double Row Cylindrical Roller Bearings represent the ideal balance of **strength, precision, and durability**—ensuring optimal motion control in the most demanding applications.

*Experience the NSK advantage—where innovation meets precision engineering.*

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Designations Nominal Dimensions Basic Load Ratings Speeds
Limiting Speeds
d
mm
D
mm
B
mm
r(min.)
mm
FW
mm
Cr
N
C0r
N
Grease
min-1
Oil (Oil-bath)
min-1
NN3048K
240
360
92
3
330
1050000
1600000
1500
1800
NN3064K
320
480
121
4
438
1660000
2670000
1100
1300
NNU4952
260
360
100
2.1
1150000
2100000
1400
1800
NN3068
340
520
133
5
473
2050000
3300000
1000
1200
NNU4952K
260
360
100
2.1
1150000
2100000
1400
1800
NN3068K
340
520
133
5
473
2050000
3300000
1000
1200
NN3052
260
400
104
4
364
1270000
1920000
1400
1700
NN3072
360
540
134
5
493
2090000
3450000
950
1200
NN3052K
260
400
104
4
364
1270000
1920000
1400
1700
NN3072K
360
540
134
5
493
2090000
3450000
950
1200
NNU4956
280
380
100
2.1
1180000
2230000
1300
1700
NNU4956K
280
380
100
2.1
1180000
2230000
1300
1700
NN3056
280
420
106
4
384
1330000
2080000
1300
1500
NN3056K
280
420
106
4
384
1330000
2080000
1300
1500
NNU4960
300
420
118
3
1510000
2870000
1200
1500
NNU4960K
300
420
118
3
1510000
2870000
1200
1500
NN3060
300
460
118
4
418
1590000
2460000
1200
1400
NN3044K
220
340
90
3
310
1000000
1480000
1700
2000
NN3060K
300
460
118
4
418
1590000
2460000
1200
1400
NNU4948
240
320
80
2.1
770000
1450000
1600
2000