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
68450/68709
114.3
180
34.925
31.75
25.4
3.5
0.8
214000
254000
71450/71750
114.3
190.5
47.625
49.212
34.925
3.5
3.3
365000
465000
938/932
114.3
212.725
66.675
66.675
53.975
7
3.3
585000
700000
HH224346/HH224310
114.3
212.725
66.675
66.675
53.975
7
3.3
700000
810000
71453/71750
115.087
190.5
47.625
49.212
34.925
3.5
3.3
365000
465000
68462/68712
117.475
180.975
34.925
31.75
25.4
3.5
3.3
200000
237000
JL724348/JL724314
120
170
25.4
25.4
19.05
3.3
3.3
160000
219000
M224748/M224710
120
174.625
35.72
36.512
27.783
3.5
1.5
261000
385000
48282/48220
120.65
182.562
39.688
38.1
33.338
3.5
3.3
280000
445000
795/792
120.65
206.375
47.625
47.625
34.925
3.3
3.3
390000
530000
48286/48220
123.825
182.562
39.688
38.1
33.338
3.5
3.3
280000
445000
JL725346/JL725316
125
175
25.4
25.4
18.288
3.3
3.3
165000
232000
LL225749/LL225710
127
165.895
18.258
17.462
13.495
1.5
1.5
108000
150000
48290/48220
127
182.562
39.688
38.1
33.338
3.5
3.3
280000
445000
67388/67322
127
196.85
46.038
46.038
38.1
3.5
3.3
355000
505000
74500/74850
127
215.9
47.625
47.625
34.925
3.5
3.3
355000
495000
799/792
128.588
206.375
47.625
47.625
34.925
3.3
3.3
390000
530000
797/792
130
206.375
47.625
47.625
34.925
3.5
3.3
390000
530000
67389/67320
130.175
203.2
46.038
46.038
38.1
3.5
3.3
355000
505000
799A/792
130.175
206.375
47.625
47.625
34.925
3.5
3.3
390000
530000
HM218248/HM218210
90
147
40
40
32.5
7
3.5
282000
345000
JHM318448/JHM318410
90
155
44
44
35.5
3
2.5
340000
390000
760/752
90.488
161.925
47.625
48.26
38.1
3.5
3.3
340000
390000
47890/47820
92.075
146.05
33.338
34.925
26.195
3.5
3.3
192000
257000