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
25590/25523
45.618
82.931
26.988
25.4
22.225
3.5
2.3
94000
99000
HM903247/HM903210
44.45
95.25
30.958
28.301
22.225
1.3
0.8
123000
122000
LM503349/LM503310
46
75
18
18
14
2.3
1.5
63000
71500
HM903249/HM903210
44.45
95.25
30.958
28.575
22.225
3.5
0.8
123000
122000
18690/18620
46.038
79.375
17.462
17.462
13.495
2.8
1.5
56500
57000
53177/53387
44.45
98.425
30.958
28.301
20.638
3.5
0.8
96000
97000
13181/13318
46.038
80.962
19.05
17.462
14.288
0.8
1.5
55500
57000
25580/25520
44.45
82.931
23.812
25.4
19.05
3.5
0.8
94000
99000
5356/5335
44.45
103.188
43.658
44.475
36.512
1.3
3.3
219000
238000
359S/354A
46.038
85
20.638
21.692
17.462
2.3
1.3
88000
81500
25580/25521
44.45
83.058
23.812
25.4
19.05
3.5
3.3
94000
99000
HM807040/HM807010
44.45
104.775
36.512
36.512
28.575
3.5
3.3
171000
192000
2984/2924
46.038
85
25.4
25.608
20.638
3.5
1.3
97500
105000
3578/3525
44.45
87.312
30.162
30.886
23.812
3.5
3.3
118000
120000
460/453A
44.45
107.95
27.783
29.317
22.225
3.5
0.8
143000
149000
436/432A
46.038
95.25
27.783
29.901
22.225
3.5
0.8
131000
126000
HM803149/HM803110
44.45
88.9
30.162
29.37
23.02
3.5
3.3
118000
129000
55175/55437
44.45
111.125
30.162
26.909
20.638
3.5
3.3
114000
110000
369A/362A
47.625
88.9
20.638
22.225
16.513
3.5
1.3
90000
85000
3782/3720
44.45
93.264
30.162
30.302
23.812
3.5
3.2
127000
136000
65385/65320
44.45
114.3
44.45
44.45
34.925
3.5
3.3
211000
205000
M804049/M804010
47.625
88.9
25.4
25.4
19.05
3.5
3.3
106000
107000
49176/49368
44.45
93.662
31.75
31.75
25.4
0.8
3.3
147000
147000
25584/25520
44.983
82.931
23.812
25.4
19.05
1.5
0.8
94000
99000