Standard Series High Precision Angular Contact Ball Bearings

**Introduction to NSK Super Precision Angular Contact Ball Bearings – Standard Series**

In the realm of high-performance motion control, precision is paramount. NSK’s **Super Precision Angular Contact Ball Bearings (Standard Series)** represent the pinnacle of engineering excellence, delivering unmatched accuracy, rigidity, and reliability for demanding applications across industries. Designed to meet the exacting requirements of advanced machinery, automotive systems, and precision equipment, these bearings combine cutting-edge materials, meticulous manufacturing tolerances, and optimized geometries to ensure superior performance in high-speed, high-load, and ultra-precise environments.

### **Technical Features & Design Innovations**
NSK’s **Standard Series Super Precision Angular Contact Ball Bearings** are engineered with a focus on minimizing friction, reducing heat generation, and maintaining dimensional stability under extreme operating conditions. Key features include:

– **Ultra-Precise Raceway Grinding:** Advanced grinding techniques ensure raceway surfaces with minimal form error, enhancing rotational accuracy and smooth motion.
– **Optimized Contact Angles (15° & 25°):** The bearings are available in multiple contact angle configurations, allowing engineers to select the ideal balance between axial and radial load capacity.
– **High-Grade Materials:** Manufactured from premium bearing steel (or optional ceramic hybrid options), these bearings resist wear, fatigue, and thermal deformation.
– **Preloaded Options:** Matched bearing sets with controlled preload minimize axial and radial play, improving rigidity for applications requiring zero backlash.
– **Special Cage Designs:** Glass fiber-reinforced polyamide (PA66) or machined brass cages reduce friction, dampen vibration, and extend service life.

### **Performance Advantages**
NSK’s Super Precision Angular Contact Ball Bearings excel where conventional bearings fall short, offering:

– **Exceptional Rotational Accuracy:** Achieve runout tolerances as low as **1 μm** or less, critical for spindle motors, CNC machines, and optical systems.
– **High-Speed Capability:** Advanced lubrication and cage designs enable stable operation at **DN values exceeding 1.5 million** (mm·rpm).
– **Enhanced Rigidity & Load Capacity:** The optimized internal geometry distributes loads evenly, reducing deformation under heavy axial/radial forces.
– **Long Service Life:** Precision manufacturing and superior materials reduce wear, even in contaminated or high-temperature environments.

### **Typical Applications**
These bearings are indispensable in industries where precision and reliability are non-negotiable:

– **Machine Tools:** High-speed spindles, CNC machining centers, and grinding machines rely on NSK bearings for micron-level accuracy.
– **Automotive Systems:** Turbochargers, electric vehicle (EV) motor shafts, and steering systems benefit from low friction and high durability.
– **Robotics & Automation:** Articulated arms, rotary tables, and linear actuators demand the rigidity and repeatability of NSK’s precision bearings.
– **Aerospace & Medical Equipment:** From aircraft gyroscopes to MRI scanners, these bearings ensure smooth, vibration-free motion.

### **Conclusion**
NSK’s **Super Precision Angular Contact Ball Bearings (Standard Series)** set the benchmark for performance in precision motion control. By integrating advanced materials, exacting manufacturing standards, and innovative design, they empower engineers to push the boundaries of speed, accuracy, and reliability in the most challenging applications. Whether in industrial automation, high-performance automotive systems, or cutting-edge medical devices, NSK’s bearings deliver the precision that drives progress.

For mission-critical applications where failure is not an option, NSK’s Super Precision Bearings provide the confidence of **engineered perfection**.

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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
kN
C0r
kN
Grease
min-1
Oil (Oil-air)
min-1
7944A5SN24
220
300
38
2.1
1.1
226
232
4700
7200
7944C
220
300
38
2.1
1.1
240
256
4100
6400
7944CSN24
220
300
38
2.1
1.1
240
246
5400
8400
7044A
220
340
56
3
1.1
355
395
2400
3300
7044C
220
340
56
3
1.1
390
430
3800
5900
7244A
220
400
65
4
1.5
515
585
2100
3000
7948A5
240
320
38
2.1
1.1
238
270
3300
5000
7948A5SN24
240
320
38
2.1
1.1
238
259
4300
6700
7948C
240
320
38
2.1
1.1
252
286
3800
5900
7948CSN24
240
320
38
2.1
1.1
253
274
5000
7800
7048A
240
360
56
3
1.1
380
430
2200
3000
7048C
240
360
56
3
1.1
415
475
3500
5500
7952A5
260
360
46
2.1
1.1
305
345
3000
4600
7952C
260
360
46
2.1
1.1
320
365
3400
5400
7052A
260
400
65
4
1.5
435
525
2000
2800
7052A5
260
400
65
4
1.5
455
545
2800
4300
7252A
260
480
80
5
2
600
750
1800
2500
7956A5
280
380
46
2.1
1.1
325
390
2800
4300
7956C
280
380
46
2.1
1.1
340
410
3200
5000
7056A
280
420
65
4
1.5
430
530
1900
2600
7960A
300
420
56
3
1.1
395
500
1900
2500
7960A5
300
420
56
3
1.1
410
520
2500
3900
7960C
300
420
56
3
1.1
435
550
3000
4600
7060A
300
460
74
4
1.5
485
605
1800
2400