Single Row Radial Ball Bearings

**NTN Single Row Deep Groove Ball Bearings: Precision, Durability & Performance for Demanding Applications**

NTN’s **Single Row Deep Groove Ball Bearings** represent the pinnacle of reliability and efficiency in radial bearing technology. Designed to handle both radial and moderate axial loads, these bearings are engineered for high-speed operation, low noise, and extended service life across a wide range of industrial and automotive applications. With precision-ground raceways, high-quality steel construction, and advanced sealing options, NTN’s deep groove ball bearings deliver unmatched performance in compact, lightweight designs.

### **Technical Features & Design Advantages**
NTN’s deep groove ball bearings incorporate several key innovations to optimize performance:
– **Robust Single-Row Design**: The deep, uninterrupted raceway geometry ensures smooth load distribution, reducing stress concentrations and wear.
– **High-Grade Materials**: Manufactured from premium chromium steel (SUJ2 equivalent) or specialty alloys, these bearings resist fatigue and deformation under heavy loads.
– **Precision Grinding & Tolerances**: NTN’s stringent manufacturing standards ensure ABEC-1 to ABEC-7 tolerance classes, minimizing vibration for sensitive applications.
– **Versatile Configurations**: Available with shields (ZZ, 2Z), rubber seals (LLU, 2LU), or open designs to suit lubrication and contamination control needs.
– **Optimized Cage Designs**: Options include pressed steel, machined brass, or polymer cages (e.g., glass fiber-reinforced PA66) for high-speed stability.

### **Performance Benefits**
– **Low Friction & Energy Efficiency**: Reduced torque losses enhance efficiency in motors, pumps, and electric vehicles (EVs).
– **High-Speed Capability**: Advanced lubrication and dynamic balancing enable stable operation at extreme RPMs (e.g., machine tool spindles).
– **Long Service Life**: NTN’s proprietary heat treatment and surface finishing technologies (like TF treatment) combat micropitting and extend bearing life.
– **Quiet Operation**: Precision engineering minimizes acoustic noise, ideal for HVAC fans and automotive alternators.

### **Typical Applications**
NTN’s deep groove ball bearings are integral to:
– **Industrial Machinery**: Electric motors, gearboxes, conveyors, and CNC equipment.
– **Automotive Systems**: Wheel hubs, transmissions, alternators, and EV drivetrains.
– **Precision Equipment**: Medical devices, robotics, and aerospace actuators.
– **Consumer Appliances**: Compressors, power tools, and agricultural machinery.

For engineers seeking a balance of load capacity, speed, and reliability, NTN’s deep groove ball bearings offer a proven solution backed by global R&D and stringent quality control. Whether in harsh industrial environments or high-performance automotive systems, these bearings ensure smooth, maintenance-free operation under demanding conditions.

*Explore NTN’s full range of sizes, seals, and specialty coatings to match your application’s exact requirements.*

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Part Number d D B r Mass
6021Z
105.000 mm
160.000 mm
26.000 mm
2.000 mm
1.591 kg
6221Z
105.000 mm
190.000 mm
36.000 mm
2.100 mm
3.690 kg
6321Z
105.000 mm
225.000 mm
49.000 mm
3.000 mm
8.080 kg
TMB321Z
105.000 mm
225.000 mm
49.000 mm
3.000 mm
8.080 kg
6021ZC3
105.000 mm
160.000 mm
26.000 mm
2.000 mm
1.610 kg
6221ZNC3
105.000 mm
190.000 mm
36.000 mm
2.100 mm
3.700 kg
6921LUC3
105.000 mm
145.000 mm
20.000 mm
1.100 mm
6321ZN
105.000 mm
225.000 mm
49.000 mm
3.000 mm
8.050 kg
6321ZNC3
105.000 mm
225.000 mm
49.000 mm
3.000 mm
8.050 kg
6921ZN
105.000 mm
145.000 mm
20.000 mm
1.100 mm
0.842 kg
6921ZNC3
105.000 mm
145.000 mm
20.000 mm
1.100 mm
0.842 kg
6021LBN
105.000 mm
160.000 mm
26.000 mm
2.000 mm
1.590 kg
6021LBNC3
105.000 mm
160.000 mm
26.000 mm
2.000 mm
1.590 kg
6021LUN
105.000 mm
160.000 mm
26.000 mm
2.000 mm
1.590 kg
6021LUNC3
105.000 mm
160.000 mm
26.000 mm
2.000 mm
1.590 kg
6221LUN
105.000 mm
190.000 mm
36.000 mm
2.100 mm
3.700 kg
6221LUNC3
105.000 mm
190.000 mm
36.000 mm
2.100 mm
3.700 kg
6321LUN
105.000 mm
225.000 mm
49.000 mm
3.000 mm
8.050 kg
6321LUNC3
105.000 mm
225.000 mm
49.000 mm
3.000 mm
8.050 kg
6021ZN
105.000 mm
160.000 mm
26.000 mm
2.000 mm
1.590 kg
6921LUN
105.000 mm
145.000 mm
20.000 mm
1.100 mm
0.842 kg
6021ZNC3
105.000 mm
160.000 mm
26.000 mm
2.000 mm
1.590 kg
6921LUNC3
105.000 mm
145.000 mm
20.000 mm
1.100 mm
0.842 kg
6221ZN
105.000 mm
190.000 mm
36.000 mm
2.100 mm
3.700 kg