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
15125/15245
31.75
62
19.05
20.638
14.288
3.5
1.3
56500
53000
15126/15250
31.75
63.5
20.638
20.638
15.875
0.8
1.3
56500
53000
M88046/M88010
31.75
68.262
22.225
22.225
17.462
1.5
1.5
68000
70500
02475/02420
31.75
68.262
22.225
22.225
17.462
3.5
1.5
68000
64000
14125A/14276
31.75
69.012
19.845
19.583
15.875
3.5
1.3
58000
56000
14123A/14274
31.75
69.012
26.982
26.721
15.875
4.3
3.3
58000
56000
2580/2523
31.75
69.85
23.812
25.357
19.05
0.8
1.3
87000
84000
2582/2523
31.75
69.85
23.812
25.357
19.05
3.5
1.3
87000
84000
3188/3120
31.75
72.626
30.162
29.997
23.812
0.8
3.3
97500
90000
HM88542/HM88510
31.75
73.025
29.37
27.783
23.02
1.3
3.3
91000
100000
346/332
31.75
80
21
22.403
17.826
0.8
1.3
84000
75500
HM88638/HM88610
32
72.233
25.4
25.4
19.842
3.3
2.3
78000
83500
1680/1620
33.338
66.675
20.638
20.638
15.875
3.5
1.5
56500
53500
M88048/M88010
33.338
68.262
22.225
22.225
17.462
0.8
1.5
68000
70500
14131/14276
33.338
69.012
19.845
19.583
15.875
0.8
1.3
58000
56000
14130/14274
33.338
69.012
19.845
19.583
15.875
3.5
3.3
58000
56000
2585/2523
33.338
69.85
23.812
25.357
19.05
3.5
1.3
87000
84000
26131/26283
33.338
72
19
18.923
15.875
3.5
1.5
64000
56000
3197/3120
33.338
72.626
30.162
29.997
23.812
0.8
3.3
97500
90000
HM88547/HM88510
33.338
73.025
29.37
27.783
23.02
0.8
3.3
91000
100000
HM89443/HM89410
33.338
76.2
29.37
28.575
23.02
0.8
3.3
96500
106000
HM89444/HM89411
33.338
76.2
29.37
28.575
23.02
3.8
0.8
96500
106000
43131/43312
33.338
79.375
25.4
24.074
17.462
3.5
1.5
83000
69500
LM48548/LM48510
34.925
65.088
18.034
18.288
13.97
SPEC
1.3
58500
57500