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
39585/39520
63.5
112.712
30.162
30.162
23.812
3.5
3.3
175000
202000
JH211749/JH211710
65
120
39
38.5
32
3
2.5
227000
249000
3982/3926
63.5
112.712
33.338
30.048
26.988
3.5
3.3
147000
173000
6379/6320
65.088
135.755
53.975
56.007
44.45
3.5
3.3
320000
355000
JLM506849/JLM506810
55
90
23
23
18.5
1.5
0.5
97500
111000
45289/45220
57.15
104.775
30.162
30.958
23.812
0.8
3.3
160000
170000
HM212044/HM212010
60.325
122.238
38.1
38.354
29.718
8
1.5
231000
245000
JM207049/JM207010
55
95
29
29
23.5
1.5
2.5
136000
152000
66587/66520
57.15
122.238
33.338
31.75
23.812
3.5
3.3
166000
156000
385/382A
55
96.838
21
21.946
15.875
2.3
0.8
90000
89500
72225C/72487
57.15
123.825
36.512
32.791
25.4
3.5
3.3
199000
199000
JH307749/JH307710
55
110
39
39
32
3
2.5
217000
225000
555S/552A
57.15
123.825
38.1
36.678
30.162
3.5
3.3
198000
221000
622X/614X
55
115
41.021
41.275
31.496
3
3
212000
214000
78225/78551
57.15
140.03
36.512
33.236
23.52
3.5
2.3
187000
183000
28680/28622
55.562
97.63
24.608
24.608
19.446
3.5
0.8
110000
129000
78225/78571
57.15
144.983
36
33.236
23.007
3.5
3.5
187000
183000
5566/5535
55.562
122.238
43.658
43.764
36.512
1.3
3.3
243000
292000
6455/6420
57.15
149.225
53.975
54.229
44.45
3.5
3.3
335000
385000
72218/72487
55.562
123.825
36.512
32.791
25.4
3.5
3.3
176000
160000
388A/382A
57.531
96.838
21
21.946
15.875
3.5
0.8
90000
89500
72218C/72487
55.562
123.825
36.512
32.791
25.4
3.5
3.3
199000
199000
3981/3926
58.738
112.712
33.338
30.048
26.988
3.5
3.3
147000
173000
66584/66520
53.975
122.238
33.338
31.75
23.812
3.5
3.3
166000
156000