Inch Series Tapered Roller Bearings

**Introduction to NSK’s Inch Series Tapered Roller Bearings: Precision, Durability, and Performance**

In industrial machinery, automotive systems, and precision equipment, the reliability of rotating components is critical to operational efficiency and longevity. NSK’s **Inch Series Tapered Roller Bearings** are engineered to meet these demands, delivering exceptional load capacity, precision alignment, and durability in challenging environments. As part of NSK’s broader portfolio of precision motion and control technologies, these bearings combine advanced materials, optimized geometry, and rigorous manufacturing standards to ensure superior performance in high-stress applications.

### **Technical Features and Design Advantages**
NSK’s Inch Series Tapered Roller Bearings are designed with a conical raceway and tapered rollers, enabling them to handle **combined radial and axial loads** efficiently. The inch-based sizing ensures compatibility with legacy machinery and North American industrial standards, making them ideal for retrofitting or upgrading existing systems. Key features include:

– **Optimized Contact Geometry**: The precision-ground rollers and raceways distribute loads evenly, reducing stress concentrations and minimizing wear.
– **High-Strength Materials**: Manufactured from premium-grade steel and subjected to advanced heat treatment processes, these bearings resist fatigue and extend service life.
– **Advanced Cage Designs**: Options include pressed steel or machined brass cages, which enhance lubrication retention and reduce friction at high speeds.
– **Sealing and Lubrication Options**: Configurations with integrated seals or specialized grease fillings cater to contaminated or high-temperature environments.

### **Performance Benefits**
The Inch Series Tapered Roller Bearings excel in applications requiring **high rigidity, shock resistance, and precise rotational control**. Their tapered design inherently accommodates misalignment, reducing edge loading and premature failure. Additional advantages include:

– **Extended Maintenance Intervals**: Robust construction and efficient lubrication systems lower downtime.
– **Energy Efficiency**: Reduced friction losses contribute to lower power consumption in industrial drives and automotive transmissions.
– **Customization**: NSK offers tailored solutions for specific load, speed, or environmental conditions.

### **Typical Applications**
These bearings are widely used in sectors where precision and reliability are non-negotiable:

– **Industrial Machinery**: Conveyors, gearboxes, and heavy-duty pumps in mining, agriculture, and construction.
– **Automotive Systems**: Wheel hubs, differential assemblies, and transmission components in trucks and off-highway vehicles.
– **Precision Equipment**: Machine tool spindles and robotics, where smooth motion and load stability are critical.

By leveraging NSK’s expertise in precision engineering, the Inch Series Tapered Roller Bearings provide a dependable solution for demanding motion control challenges—enhancing performance while reducing total cost of ownership. Whether in harsh industrial settings or high-speed automotive applications, NSK’s innovations ensure optimal functionality and longevity.

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Designations Nominal Dimensions Basic Load Ratings
d
mm
D
mm
T
mm
B
mm
C
mm
Cone r (min.)
mm
Cup r (min.)
mm
Cr
N
C0r
N
757/752
82.55
161.925
47.625
48.26
38.1
3.5
3.3
340000
390000
497/493
85.725
136.525
30.162
29.769
22.225
3.5
3.3
160000
192000
855/854
88.9
190.5
57.15
57.531
44.45
8
3.3
435000
500000
6559/6535
82.55
161.925
53.975
55.1
42.862
3.5
3.3
400000
480000
HM617049/HM617010
85.725
142.138
42.862
42.862
34.133
4.8
3.3
263000
345000
HH221434/HH221410
88.9
190.5
57.15
57.531
46.038
8
3.3
480000
520000
757/753
82.55
168.275
47.625
48.26
38.1
3.5
3.3
340000
390000
665/653
85.725
146.05
41.275
41.275
31.75
3.5
3.3
254000
296000
JM718149/JM718110
90
145
35
34
27
3
2.5
234000
285000
842/832
82.55
168.275
53.975
56.363
41.275
3.5
3.3
425000
470000
665A/653
85.725
146.05
41.275
41.275
31.75
6.4
3.3
254000
296000
27689/27620
83.345
125.412
25.4
25.4
19.845
0.8
1.5
126000
164000
596/592A
85.725
152.4
39.688
36.322
30.162
3.5
3.2
225000
285000
27690/27620
83.345
125.412
25.4
25.4
19.845
3.5
1.5
126000
164000
758/752
85.725
161.925
47.625
48.26
38.1
3.5
3.3
340000
390000
498/493
84.138
136.525
30.162
29.769
22.225
3.5
3.3
160000
192000
677/672
85.725
168.275
41.275
41.275
30.162
3.5
3.3
274000
345000
664/653
84.138
146.05
41.275
41.275
31.75
3.5
3.3
254000
296000
HH221432/HH221410
87.312
190.5
57.15
57.531
46.038
8
3.3
480000
520000
9385/9321
84.138
171.45
49.212
46.038
31.75
3.5
3.3
315000
310000