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
72200C/72487
50.8
123.825
36.512
32.791
25.4
3.5
3.3
199000
199000
66187/66462
47.625
117.475
33.338
31.75
23.812
3.5
3.3
168000
156000
368/362A
50.8
88.9
20.638
22.225
16.513
1.5
1.3
90000
85000
65200/65500
50.8
127
44.45
44.45
34.925
3.5
3.3
244000
258000
72187/72487
47.625
123.825
36.512
32.791
25.4
3.5
3.3
176000
160000
368A/362A
50.8
88.9
20.638
22.225
16.513
3.5
1.3
90000
85000
6279/6220
50.8
127
50.8
52.388
41.275
3.5
3.3
290000
300000
HM804848/HM804810
48.412
95.25
30.162
29.37
23.02
2.3
3.3
130000
143000
28580/28521
50.8
92.075
24.608
25.4
19.845
3.5
0.8
104000
117000
28584/28521
52.388
92.075
24.608
25.4
19.845
3.5
0.8
104000
117000
HM804849/HM804810
48.412
95.25
30.162
29.37
23.02
3.5
3.3
130000
143000
3775/3730
50.8
93.264
30.162
30.302
23.812
0.8
0.8
127000
136000
377/372
52.388
100
25
22.225
21.824
2.3
2
95000
93000
HM807044/HM807011
49.212
104.775
36.512
36.512
28.575
3.5
0.8
164000
182000
3780/3730
50.8
93.264
30.162
30.302
23.812
3.5
0.8
127000
136000
55206/55437
52.388
111.125
30.162
26.909
20.638
3.5
3.3
114000
110000
HH506348/HH506310
49.212
114.3
44.45
44.45
36.068
3.5
3.3
242000
243000
33889/33821
50.8
95.25
27.783
28.575
22.225
3.5
2.3
135000
144000
4595/4535
53.975
104.775
39.688
40.157
33.338
3.5
3.3
185000
210000
JLM104948/JLM104910
50
82
21.5
21.5
17
3
0.5
87500
96000
49585/49520
50.8
101.6
31.75
31.75
25.4
3.5
3.3
146000
150000
539/532X
53.975
107.95
36.512
36.957
28.575
3.5
3.3
177000
182000
LM104947A/LM104911
50
82.55
21.59
22.225
16.51
0.5
1.3
87500
96000
529/522
50.8
101.6
34.925
36.068
26.988
0.8
3.3
169000
169000