Single-Row Deep Groove Ball Bearings

**Introduction to NSK’s Single Row Deep Groove Ball Bearings: Precision, Performance, and Reliability**

NSK’s Single Row Deep Groove Ball Bearings represent the pinnacle of precision motion and control technology, engineered to deliver exceptional performance, durability, and efficiency across a wide range of industrial, automotive, and precision equipment applications. As a foundational component in rotating machinery, these bearings are designed to handle radial and axial loads simultaneously, offering smooth operation, low friction, and long service life even under demanding conditions.

### **Technical Features and Design Excellence**
NSK’s Single Row Deep Groove Ball Bearings are characterized by their robust construction and advanced material science. Key features include:
– **High-Precision Grinding:** Manufactured to ultra-tight tolerances, these bearings ensure minimal vibration and noise, making them ideal for high-speed applications.
– **Optimized Raceway Geometry:** The deep groove design allows for effective load distribution, enhancing both radial and axial load capacity.
– **Premium Steel and Lubrication Options:** Utilizing high-grade chromium steel (SUJ2 equivalent) and advanced heat treatment processes, NSK bearings achieve superior hardness and fatigue resistance. Custom lubrication options, including grease, oil, or solid lubricants, further extend service intervals.
– **Sealed and Shielded Variants:** Available with rubber seals (RS, 2RS) or metal shields (ZZ) to protect against contamination while retaining lubrication, improving reliability in harsh environments.

### **Performance Advantages**
NSK’s deep groove ball bearings are engineered to outperform competitors in critical areas:
– **Low Friction & Energy Efficiency:** Precision-ground surfaces and optimized internal geometries reduce torque losses, contributing to energy savings in motors, pumps, and automotive systems.
– **High-Speed Capability:** Advanced cage designs (stamped steel, machined brass, or polymer) minimize centrifugal forces, enabling stable operation at elevated speeds.
– **Extended Service Life:** NSK’s proprietary materials and surface treatments, such as Super-TF coating, enhance wear resistance and corrosion protection, reducing maintenance downtime.

### **Typical Applications**
These bearings are indispensable in industries where precision and reliability are paramount:
– **Industrial Machinery:** Electric motors, gearboxes, conveyors, and machine tool spindles benefit from their high load capacity and smooth rotation.
– **Automotive Systems:** Used in alternators, wheel hubs, and transmission systems, NSK bearings contribute to fuel efficiency and reduced NVH (Noise, Vibration, Harshness).
– **Precision Equipment:** Medical devices, robotics, and semiconductor manufacturing equipment rely on their quiet, vibration-free operation for accuracy.

With decades of expertise in bearing technology, NSK continues to innovate, ensuring that its Single Row Deep Groove Ball Bearings meet the evolving demands of modern engineering—delivering unmatched performance, reliability, and efficiency across global industries.

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Designations Nominal Dimensions Basic Load Ratings Speeds
Limiting Speeds
d
mm
D
mm
B
mm
r(min.)
mm
Cr
N
C0r
N
Grease
min-1
Oil (Oil-bath)
min-1
6320ZZ
100
215
47
3
191000
141000
2800
6821
105
130
13
1
21800
23900
4800
5600
6821DDU
105
130
13
1
21800
23900
2600
6821N
105
130
13
1
21800
23900
4800
5600
6821NR
105
130
13
1
21800
23900
4800
5600
6821VV
105
130
13
1
21800
23900
4800
6821ZZ
105
130
13
1
21800
23900
4800
6921
105
145
20
1.1
46500
42000
4300
5300
6921N
105
145
20
1.1
46500
42000
4300
5300
6921NR
105
145
20
1.1
46500
42000
4300
5300
6921VV
105
145
20
1.1
46500
42000
4300
6921ZZ
105
145
20
1.1
46500
42000
4300
16021
105
160
18
1
57000
50500
4000
4800
6021
105
160
26
2
79500
66000
4500
5600
6021DDU
105
160
26
2
79500
66000
2400
6021N
105
160
26
2
79500
66000
4500
5600
6021NR
105
160
26
2
79500
66000
4500
5600
6021VV
105
160
26
2
79500
66000
4500
6021ZZ
105
160
26
2
79500
66000
4500
6221
105
190
36
2.1
146000
105000
3800
4500
6221DDU
105
190
36
2.1
146000
105000
2200
6221N
105
190
36
2.1
146000
105000
3800
4500
6221NR
105
190
36
2.1
146000
105000
3800
4500
6221VV
105
190
36
2.1
146000
105000
3800