Single-Row Angular Contact Ball Bearings

**Introduction to NSK Single Row Angular Contact Ball Bearings: Precision Performance for Demanding Applications**

NSK’s Single Row Angular Contact Ball Bearings represent the pinnacle of precision motion and control technology, engineered to deliver exceptional performance in applications requiring high-speed operation, rigidity, and precise axial load handling. Designed with advanced materials, optimized geometries, and stringent manufacturing tolerances, these bearings are a critical component in industrial machinery, automotive systems, and high-precision equipment where reliability and efficiency are paramount.

### **Technical Features and Design Excellence**
Single Row Angular Contact Ball Bearings from NSK are distinguished by their unique internal design, featuring raceways that are offset relative to each other in the bearing axis direction. This configuration enables the bearing to support combined radial and axial loads—simultaneously or individually—with superior accuracy. Key technical features include:

– **Contact Angle Optimization**: Available in standard contact angles (typically 15°, 25°, 30°, or 40°), the bearings are tailored to balance thrust capacity and radial load performance. A steeper angle enhances axial load capacity, while a shallower angle improves high-speed capability.
– **Precision-Grade Manufacturing**: NSK employs ultra-precise grinding and super-finishing techniques to minimize friction, vibration, and noise, ensuring smooth operation even at extreme speeds.
– **High-Quality Materials**: Manufactured from premium bearing steel or specialty alloys (such as NSK’s proprietary HTF steel for high-temperature environments), these bearings resist wear, fatigue, and deformation under heavy loads.
– **Cage Designs**: Options include pressed steel, machined brass, or polymer cages (e.g., PEEK) to optimize performance in high-speed, high-temperature, or corrosive environments.

### **Performance Advantages**
NSK’s Single Row Angular Contact Ball Bearings excel in applications demanding precision and durability:

– **High-Speed Capability**: Low friction and optimized internal geometry allow for stable operation at elevated rotational speeds, critical for machine tool spindles and turbochargers.
– **Rigidity and Accuracy**: The bearings’ axial stiffness ensures minimal deflection under load, maintaining positional accuracy in CNC machines, robotics, and measuring instruments.
– **Extended Service Life**: Advanced heat treatment processes and surface coatings (such as NSK’s Super-TF treatment) enhance durability, reducing maintenance downtime in harsh industrial environments.

### **Typical Applications**
These bearings are indispensable across industries where precision motion control is essential:

– **Industrial Machinery**: Machine tool spindles, gearboxes, and pumps rely on these bearings for high-speed, high-precision rotation.
– **Automotive Systems**: Turbochargers, wheel hubs, and electric vehicle (EV) drivetrains benefit from their ability to handle dynamic loads and harsh operating conditions.
– **Aerospace and Robotics**: Used in actuators, flight control systems, and robotic joints, where compact design and reliability are critical.

By combining cutting-edge engineering with decades of expertise, NSK’s Single Row Angular Contact Ball Bearings provide unmatched performance, ensuring efficiency and longevity in the most demanding applications. Whether in high-speed automation or heavy-load industrial systems, NSK delivers the precision and reliability that industries trust.

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Designations Nominal Dimensions Basic Load Ratings Speeds
Limiting Speeds
d
mm
D
mm
B
mm
r(min.)
mm
r1(min.)
mm
Cr
N
C0r
N
Grease
min-1
Oil (Oil-bath)
min-1
7221AW
105
190
36
2.1
1.1
172000
142000
3000
4000
7221BW
105
190
36
2.1
1.1
156000
129000
2200
3000
7221BEAT85
105
190
36
2.1
1.1
162000
133000
3000
4500
7321A
105
225
49
3
1.1
228000
193000
2600
3600
7321B
105
225
49
3
1.1
210000
177000
2400
3200
7321BEAT85
105
225
49
3
1.1
235000
203000
2600
4000
7321BEAT7
105
225
49
3
1.1
235000
203000
2600
4000
7022A
110
170
28
2
1
106000
95500
4000
5300
7222AW
110
200
38
2.1
1.1
187000
158000
2800
3800
7222BW
110
200
38
2.1
1.1
169000
144000
2000
2800
7222BEAT85
110
200
38
2.1
1.1
169000
144000
2800
4300
7222BEAMR
110
200
38
2.1
1.1
169000
144000
2800
4300
7322A
110
240
50
3
1.1
242000
215000
2600
3400
7322B
110
240
50
3
1.1
222000
197000
2200
3000
7322BEAT85
110
240
50
3
1.1
249000
226000
2600
3800
7322BEAMR
110
240
50
3
1.1
249000
226000
2600
3800
7024A
120
180
28
2
1
112000
107000
3600
5000
7224A
120
215
40
2.1
1.1
201000
177000
3200
4500
7224B
120
215
40
2.1
1.1
182000
162000
2400
3200
7224BEAT85
120
215
40
2.1
1.1
197000
177000
2600
3800
7224BEAMR
120
215
40
2.1
1.1
197000
177000
2600
3800
7224BEAT7
120
215
40
2.1
1.1
197000
177000
2600
3800
7324A
120
260
55
3
1.1
271000
252000
2200
3000
7324B
120
260
55
3
1.1
248000
231000
2000
2800