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
NN3030K
150
225
56
2.1
206
410000
585000
2600
3000
NNU4940
200
280
80
2.1
700000
1220000
1900
2400
NNU4924
120
165
45
1.1
225000
360000
3200
4000
NNU4932
160
220
60
2
450000
760000
2400
3000
NNU4940K
200
280
80
2.1
700000
1220000
1900
2400
NNU4924K
120
165
45
1.1
225000
360000
3200
4000
NNU4932K
160
220
60
2
450000
760000
2400
3000
NN3040
200
310
82
2.1
282
805000
1170000
1800
2200
NN3024
120
180
46
2
165
294000
405000
3200
3800
NN3032
160
240
60
2.1
219
460000
660000
2400
2800
NN3040K
200
310
82
2.1
282
805000
1170000
1800
2200
NN3024K
120
180
46
2
165
294000
405000
3200
3800
NN3032K
160
240
60
2.1
219
460000
660000
2400
2800
NNU4944
220
300
80
2.1
735000
1330000
1700
2200
NNU4926
130
180
50
1.5
335000
545000
3000
3800
NNU4934
170
230
60
2
465000
805000
2400
2800
NNU4944K
220
300
80
2.1
735000
1330000
1700
2200
NN3012K
60
95
26
1.1
86.1
90000
106000
6300
7500
NNU4920K
100
140
40
1.1
190000
295000
4000
5000
NN3005
25
47
16
0.6
41.3
31500
30000
14000
17000
NN3013K
65
100
26
1.1
91
95000
116000
6000
7100
NN3020
100
150
37
1.5
137
193000
265000
4000
4800
NN3005K
25
47
16
0.6
41.3
31500
30000
14000
17000
NN3013
65
100
26
1.1
91
95000
116000
6000
7100