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
H715341/H715311
66.675
136.525
46.038
46.038
36.512
3.5
3.3
287000
370000
655/653
69.85
146.05
41.275
41.275
31.75
3.5
3.3
254000
296000
567/563
73.025
127
36.512
36.17
28.575
3.5
3.3
204000
234000
399A/394A
68.262
110
22
21.996
18.824
2.3
1.3
105000
113000
6454/6420
69.85
149.225
53.975
54.229
44.45
5
3.3
335000
385000
657/653
73.025
146.05
41.275
41.275
31.75
3.5
3.3
254000
296000
480/472
68.262
120
29.794
29.007
24.237
3.5
2
151000
169000
745A/742
69.85
150.089
44.45
46.672
36.512
3.5
3.3
325000
370000
6460/6420
73.025
149.225
53.975
54.229
44.45
3.5
3.3
355000
410000
560S/553X
68.262
122.238
38.1
36.678
30.162
3.5
3.3
198000
221000
JLM813049/JLM813010
70
110
26
25
20.5
1
2.5
121000
152000
568/563
73.817
127
36.512
36.17
28.575
0.8
3.3
204000
234000
HM212046/HM212010
63.5
122.238
38.1
38.354
29.718
3.5
1.5
231000
245000
H715340/H715311
65.088
136.525
46.038
46.038
36.512
3.5
3.3
287000
370000
5582/5535
60.325
122.238
43.658
43.764
36.512
0.8
3.3
243000
292000
HM212047/HM212010
63.5
122.238
38.1
38.354
29.718
7
1.5
231000
245000
395A/394A
66.675
110
22
21.996
18.824
0.8
1.3
105000
113000
65237/65500
60.325
127
44.45
44.45
34.925
3.5
3.3
244000
258000
HM212047/HM212011
63.5
122.238
38.1
38.354
29.718
7
3.3
231000
245000
395S/394A
66.675
110
22
21.996
18.824
3.5
1.3
105000
113000
637/633
60.325
130.175
41.275
41.275
31.75
3.5
3.3
239000
263000
5584/5535
63.5
122.238
43.658
43.764
36.512
3.5
3.3
243000
292000
3984/3920
66.675
112.712
30.162
30.048
23.812
3.5
3.2
128000
149000
6376/6320
60.325
135.755
53.975
56.007
44.45
3.5
3.3
320000
355000