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
LM29748/LM29710
38.1
65.088
18.034
18.288
13.97
SPEC
1.3
52000
55000
LM29749/LM29711
38.1
65.088
19.812
18.288
15.748
2.3
1.3
52000
55000
19150/19268
38.1
68.262
15.875
16.52
11.908
1.5
1.5
55500
53500
13687/13621
38.1
69.012
19.05
19.05
15.083
2
2.3
60000
61000
13685/13620
38.1
69.012
19.05
19.05
15.083
3.5
0.8
60000
61000
16150/16284
38.1
72.238
20.638
20.638
15.875
3.5
1.3
60000
59500
2788/2735X
38.1
73.025
23.812
25.654
19.05
3.5
0.8
90500
91000
2788/2729
38.1
76.2
23.812
25.654
19.05
3.5
0.8
90500
91000
2788/2720
38.1
76.2
23.812
25.654
19.05
3.5
3.3
90500
91000
3490/3420
38.1
79.375
29.37
29.771
23.812
3.5
3.3
108000
106000
27880/27820
38.1
80.035
24.608
23.698
18.512
0.8
1.5
84500
84500
HM801346/HM801310
38.1
82.55
29.37
28.575
23.02
0.8
3.3
107000
117000
M88043/M88010
30.162
68.262
22.225
22.225
17.462
2.3
1.5
68000
70500
2559/2523
30.162
69.85
23.812
25.357
19.05
0.8
1.3
87000
84000
2558/2523
30.162
69.85
23.812
25.357
19.05
2.3
1.3
87000
84000
43118/43300
30.162
76.2
24.608
24.074
16.67
1.5
C3.3
83000
69500
15120/15245
30.213
62
19.05
20.638
14.288
0.8
1.3
56500
53000
15119/15245
30.213
62
19.05
20.638
14.288
1.5
1.3
56500
53000
15118/15245
30.213
62
19.05
20.638
14.288
3.5
1.3
56500
53000
M86648A/M86610
30.955
64.292
21.433
21.433
16.67
1.5
1.5
63000
64500
08125/08231
31.75
58.738
14.684
15.08
10.716
1
1
35500
33500
LM67048/LM67010
31.75
59.131
15.875
16.764
11.811
SPEC
1.3
42500
41500
15123/15245
31.75
62
18.161
19.05
14.288
SPEC
1.3
56500
53000
15126/15245
31.75
62
19.05
20.638
14.288
0.8
1.3
56500
53000