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
1380/1328
22.225
52.388
19.368
20.168
14.288
1.5
1.5
50000
43000
A4050/A4138
12.7
34.988
10.998
10.988
8.73
1.3
1.3
14400
10900
05075/05185
19.05
47
14.381
14.381
11.112
1.3
1.3
29300
23900
1380/1329
22.225
53.975
19.368
20.168
14.288
1.5
1.5
50000
43000
A4059/A4138
15
34.988
10.998
10.988
8.73
0.8
1.3
14400
10900
09067/09195
19.05
49.225
18.034
19.05
14.288
1.3
1.3
44000
35500
1755/1729
22.225
56.896
19.368
19.837
15.875
1.3
1.3
47000
40500
L21549/L21511
15.875
34.988
10.998
10.998
8.712
1.3
1.3
17000
13400
09078/09195
19.05
49.225
19.845
21.539
14.288
1.2
1.3
46000
37000
1280/1220
22.225
57.15
22.225
22.225
17.462
0.8
1.5
53000
44000
A6062/A6157
15.875
39.992
12.014
11.153
9.525
1.3
1.3
18400
15700
09067/09196
19.05
49.225
21.209
19.05
17.462
1.3
1.5
46000
37000
LM72849/LM72810
22.606
47
15.5
15.5
12
1.5
1
32500
30000
03062/03162
15.875
41.275
14.288
14.681
11.112
1.3
2
26200
19900
09074/09194
19.05
49.225
23.02
21.539
17.462
C1.5
3.5
46000
37000
L44640/L44610
23.812
50.292
14.224
14.732
10.668
1.5
1.3
34000
32000
11590/11520
15.875
42.862
14.288
14.288
9.525
1.5
1.5
21300
17200
21075/21212
19.05
53.975
22.225
21.839
15.875
1.5
2.3
50000
39500
1779/1729
23.812
56.896
19.368
19.837
15.875
0.8
1.3
47000
40500
17580/17520
15.875
42.862
16.67
16.67
13.495
1.5
1.5
33000
26300
05079/05185
19.99
47
14.381
14.381
11.112
1.5
1.3
29300
23900
JHM33449/JHM33410
24
55
25
25
21
2
2
61000
55000
05062/05175
15.875
44.45
15.494
14.381
11.43
1.5
1.5
29300
23900
07079/07204
20
51.994
15.011
14.26
12.7
1.5
1.3
32000
27900