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
NN3026MB
130
200
52
2
325
475
4600
5500
NN3028ZTB
140
210
53
2
204
258
5200
6800
NN4924MBKR
120
165
45
1.1
211
360
5300
6400
NN3026MBKR
130
200
52
2
325
475
4600
5500
NN3028ZTBKR
140
210
53
2
204
258
5200
6800
NNU4924MB
120
165
45
1.1
211
360
5300
6400
NN3026TB
130
200
52
2
325
475
5200
6100
NN3930MB
150
210
45
2
300
490
4200
5000
NNU4924MBKR
120
165
45
1.1
211
360
5300
6400
NN3026TBKR
130
200
52
2
325
475
5200
6100
NN3930MBKR
150
210
45
2
300
490
4200
5000
NN3024MB
120
180
46
2
275
405
5000
6000
NN3026ZTB
130
200
52
2
195
238
5500
7200
NN4930MB
150
210
60
2
405
715
4200
5000
NN3020TBKR
100
150
37
1.5
180
265
6800
8000
NN4922MBKR
110
150
40
1.1
192
335
5800
7000
NN3019MB
95
145
37
1.5
173
246
6300
7500
NN3020ZTB
100
150
37
1.5
107
133
7200
9500
NNU4922MB
110
150
40
1.1
192
335
5800
7000
NN3019MBKR
95
145
37
1.5
173
246
6300
7500
NN3020ZTBKR
100
150
37
1.5
107
133
7200
9500
NNU4922MBKR
110
150
40
1.1
192
335
5800
7000
NN3019TB
95
145
37
1.5
173
246
7100
8400
NN4921MB
105
145
40
1.1
185
315
6000
7200