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
67885/67820
190.5
266.7
47.625
46.833
38.1
3.5
3.3
425000
720000
JHM840449/JHM840410
200
300
65
62
51
3.5
2.5
755000
1130000
67983/67920
203.2
282.575
46.038
46.038
36.512
3.5
3.3
415000
715000
67985/67920
206.375
282.575
46.038
46.038
36.512
3.5
3.3
415000
715000
HH221449/HH221410
101.6
190.5
57.15
57.531
46.038
8
3.3
480000
520000
HH224335/HH224310
101.6
212.725
66.675
66.675
53.975
7
3.3
700000
810000
782/772
104.775
180.975
47.625
48.006
38.1
3.5
3.3
315000
375000
787/772
104.775
180.975
47.625
48.006
38.1
7
3.3
315000
375000
71412/71750
104.775
190.5
47.625
49.212
34.925
3.5
3.3
365000
465000
56418/56650
106.362
165.1
36.512
36.512
26.988
3.5
3.3
229000
305000
37425/37625
107.95
158.75
23.02
21.438
15.875
3.5
3.3
126000
165000
LM522546/LM522510
107.95
159.987
34.925
34.925
26.988
3.5
3.3
201000
315000
48190/48120
107.95
161.925
34.925
34.925
26.988
3.5
3.3
202000
280000
56425/56650
107.95
165.1
36.512
36.512
26.988
3.5
3.3
229000
305000
71425/71750
107.95
190.5
47.625
49.212
34.925
3.5
3.3
365000
465000
HH224340/HH224310
107.95
212.725
66.675
66.675
53.975
8
3.3
700000
810000
LM522549/LM522510
109.987
159.987
34.925
34.925
26.988
3.5
3.3
201000
315000
LM522548/LM522510
109.987
159.987
34.925
34.925
26.988
8
3.3
201000
315000
64433/64700
109.992
177.8
41.275
41.275
30.162
3.5
3.3
286000
375000
JM822049/JM822010
110
165
35
35
26.5
3
2.5
239000
320000
JHM522649/JHM522610
110
180
47
46
38
3
2.5
380000
490000
71437/71750
111.125
190.5
47.625
49.212
34.925
3.5
3.3
365000
465000
L623149/L623110
114.3
152.4
21.433
21.433
16.67
1.5
1.5
110000
178000
64450/64700
114.3
177.8
41.275
41.275
30.162
3.5
3.3
286000
375000