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
46143/46368
36.512
93.662
31.75
31.75
26.195
1.5
3.3
129000
133000
3478/3420
34.925
79.375
29.37
29.771
23.812
3.5
3.3
108000
106000
JL69349/JL69310
38
63
17
17
13.5
SPEC
1.3
46000
49500
19138/19268
34.976
68.262
15.875
16.52
11.908
1.5
1.5
55500
53500
13889/13830
38.1
63.5
12.7
11.908
9.525
1.5
0.8
29700
30500
14139/14283
34.976
72.085
22.385
19.583
18.415
1.3
2.3
58000
56000
LM29749/LM29710
38.1
65.088
18.034
18.288
13.97
2.3
1.3
52000
55000
28138/28315
34.976
80
21.006
20.94
15.875
1.5
1.5
69500
64500
LM29748/LM29710
38.1
65.088
18.034
18.288
13.97
SPEC
1.3
52000
55000
L68149/L68110
35
59.131
15.875
16.764
11.938
SPEC
1.3
43000
47000
LM29749/LM29711
38.1
65.088
19.812
18.288
15.748
2.3
1.3
52000
55000
L68149/L68111
35
59.975
15.875
16.764
11.938
SPEC
1.3
43000
47000
19150/19268
38.1
68.262
15.875
16.52
11.908
1.5
1.5
55500
53500
LM78349/LM78310
35
62
16.7
17
13.6
SPEC
1
47000
50000
13687/13621
38.1
69.012
19.05
19.05
15.083
2
2.3
60000
61000
HM88649/HM88610
34.925
72.233
25.4
25.4
19.842
2.3
2.3
78000
83500
LM78349/LM78310A
35
62
16.7
17
13.6
SPEC
1.5
47000
50000
13685/13620
38.1
69.012
19.05
19.05
15.083
3.5
0.8
60000
61000
02878/02820
34.925
73.025
22.225
22.225
17.462
0.8
3.3
67000
64500
M38547/M38511
35
65.987
20.638
20.638
16.67
3.5
2.3
65500
62500
16150/16284
38.1
72.238
20.638
20.638
15.875
3.5
1.3
60000
59500
2877/2820
34.925
73.025
22.225
23.812
17.462
3.5
3.3
78000
77000
23691/23621
35
73.025
26.988
26.975
22.225
3.5
0.8
92500
88500
2788/2735X
38.1
73.025
23.812
25.654
19.05
3.5
0.8
90500
91000