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
LM48548/LM48511
34.925
65.088
20.32
18.288
16.256
SPEC
1.3
58500
57500
M38549/M38510
34.925
66.675
20.638
20.638
16.67
3.5
2.3
65500
62500
14137A/14276
34.925
69.012
19.845
19.583
15.875
1.5
1.3
58000
56000
14138A/14276
34.925
69.012
19.845
19.583
15.875
3.5
1.3
58000
56000
07098/07204
24.981
51.994
15.011
14.26
12.7
1.5
1.3
32000
27900
07098/07205
24.981
52.001
15.011
14.26
12.7
1.5
2
32000
27900
17098/17244
24.981
62
16.002
16.566
14.288
1.5
1.5
45500
39500
07097/07196
25
50.005
13.495
14.26
9.525
1.5
1
32000
27900
07097/07204
25
51.994
15.011
14.26
12.7
1.5
1.3
32000
27900
07100/07196
25.4
50.005
13.495
14.26
9.525
1
1
32000
27900
07100SA/07196
25.4
50.005
13.495
14.26
9.525
3.3
1
32000
27900
L44643/L44610
25.4
50.292
14.224
14.732
10.668
1.3
1.3
34000
32000
15578/15520
25.4
57.15
17.462
17.462
13.495
1.3
1.5
49000
45500
M84548/M84510
25.4
57.15
19.431
19.431
14.732
1.5
1.5
52000
49000
M84249/M84210
25.4
59.53
23.368
23.114
18.288
0.8
1.5
61500
58000
15101/15245
25.4
62
19.05
20.638
14.288
0.8
1.3
56500
53000
15100/15250X
25.4
63.5
20.638
20.638
15.875
3.5
1.5
56500
53000
M86643/M86610
25.4
64.292
21.433
21.433
16.67
1.5
1.5
63000
64500
23100/23256
25.4
65.088
22.225
21.463
15.875
1.5
1.5
55500
47500
02473/02420
25.4
68.262
22.225
22.225
17.462
0.8
1.5
68000
64000
HM88630/HM88610
25.4
72.233
25.4
25.4
19.842
0.8
2.3
78000
83500
41100/41286
25.4
72.626
24.608
24.257
17.462
2.3
1.5
73500
58000
L44649/L44610
26.988
50.292
14.224
14.732
10.668
3.5
1.3
34000
32000
1997X/1922
26.988
57.15
19.845
19.355
15.875
3.3
1.5
49500
44500