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
59200/59429
50.8
108.966
34.925
36.512
26.988
3.5
3.3
178000
181000
55200/55437
50.8
111.125
30.162
26.909
20.638
3.5
3.3
114000
110000
55200C/55437
50.8
111.125
30.162
26.909
20.638
3.5
3.3
101000
138000
72200/72487
50.8
123.825
36.512
32.791
25.4
3.5
3.3
176000
160000
72200C/72487
50.8
123.825
36.512
32.791
25.4
3.5
3.3
199000
199000
65200/65500
50.8
127
44.45
44.45
34.925
3.5
3.3
244000
258000
6279/6220
50.8
127
50.8
52.388
41.275
3.5
3.3
290000
300000
28584/28521
52.388
92.075
24.608
25.4
19.845
3.5
0.8
104000
117000
377/372
52.388
100
25
22.225
21.824
2.3
2
95000
93000
55206/55437
52.388
111.125
30.162
26.909
20.638
3.5
3.3
114000
110000
4595/4535
53.975
104.775
39.688
40.157
33.338
3.5
3.3
185000
210000
539/532X
53.975
107.95
36.512
36.957
28.575
3.5
3.3
177000
182000
25580/25520
44.45
82.931
23.812
25.4
19.05
3.5
0.8
94000
99000
25580/25521
44.45
83.058
23.812
25.4
19.05
3.5
3.3
94000
99000
3578/3525
44.45
87.312
30.162
30.886
23.812
3.5
3.3
118000
120000
HM803149/HM803110
44.45
88.9
30.162
29.37
23.02
3.5
3.3
118000
129000
3782/3720
44.45
93.264
30.162
30.302
23.812
3.5
3.2
127000
136000
49176/49368
44.45
93.662
31.75
31.75
25.4
0.8
3.3
147000
147000
49175/49368
44.45
93.662
31.75
31.75
25.4
3.5
3.3
147000
147000
46176/46368
44.45
93.662
31.75
31.75
26.195
3.5
3.3
129000
133000
438/432
44.45
95.25
27.783
29.901
22.225
3.5
2.3
131000
126000
HM804843/HM804810
44.45
95.25
30.162
29.37
23.02
3.5
3.3
130000
143000
53176/53375
44.45
95.25
30.958
28.301
20.638
1.3
0.8
102000
90000
53178/53375
44.45
95.25
30.958
28.301
20.638
2
0.8
96000
97000