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
JM720249/JM720210
100
155
36
35
28
3
2.5
235000
325000
JHM318448/JHM318410
90
155
44
44
35.5
3
2.5
340000
390000
594/592
95.25
152.4
39.688
36.322
33.338
3.5
3.3
225000
285000
JHM720249/JHM720210
100
160
41
40
32
3
2.5
294000
380000
760/752
90.488
161.925
47.625
48.26
38.1
3.5
3.3
340000
390000
683/672
95.25
168.275
41.275
41.275
30.162
3.5
3.3
274000
345000
52393/52618
100.012
157.162
36.512
36.116
26.195
3.5
3.3
222000
286000
47890/47820
92.075
146.05
33.338
34.925
26.195
3.5
3.3
192000
257000
77375/77675
95.25
171.45
47.625
48.26
38.1
3.5
3.3
345000
415000
52400/52618
101.6
157.162
36.512
36.116
26.195
3.5
3.3
222000
286000
42362/42584
92.075
148.43
28.575
28.971
21.433
3.5
3
172000
218000
776/772
95.25
180.975
47.625
48.006
38.1
3.5
3.3
315000
375000
52400/52637
101.6
161.925
36.512
36.116
26.195
3.5
3.3
222000
286000
598/592A
92.075
152.4
39.688
36.322
30.162
3.5
3.2
225000
285000
864/854
95.25
190.5
57.15
57.531
44.45
8
3.3
435000
500000
687/672
101.6
168.275
41.275
41.275
30.162
3.5
3.3
274000
345000
598A/592A
92.075
152.4
39.688
36.322
30.162
6.4
3.2
225000
285000
HH221440/HH221410
95.25
190.5
57.15
57.531
46.038
8
3.3
480000
520000
780/772
101.6
180.975
47.625
48.006
38.1
3.5
3.3
315000
375000
681/672
92.075
168.275
41.275
41.275
30.162
3.5
3.3
274000
345000
42381/42584
96.838
148.43
28.575
28.971
21.433
3.5
3
172000
218000
861/854
101.6
190.5
57.15
57.531
44.45
8
3.3
435000
500000
857/854
92.075
190.5
57.15
57.531
44.45
8
3.3
435000
500000
42381/42587
96.838
149.225
31.75
28.971
24.606
3.5
3.3
172000
218000