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
855/854
88.9
190.5
57.15
57.531
44.45
8
3.3
435000
500000
6559/6535
82.55
161.925
53.975
55.1
42.862
3.5
3.3
400000
480000
HM617049/HM617010
85.725
142.138
42.862
42.862
34.133
4.8
3.3
263000
345000
HH221434/HH221410
88.9
190.5
57.15
57.531
46.038
8
3.3
480000
520000
6576/6535
76.2
161.925
53.975
55.1
42.862
3.5
3.3
400000
480000
27687/27620
82.55
125.412
25.4
25.4
19.845
3.5
1.5
126000
164000
JLM714149/JLM714110
75
115
25
25
19
3
2.5
125000
150000
6575/6536
76.2
161.925
53.975
55.1
42.862
6.4
0.8
400000
480000
495/492A
82.55
133.35
30.162
29.769
22.225
3.5
3.3
160000
192000
JM714249/JM714210
75
120
31
29.5
25
3
2.5
158000
198000
6575/6535
76.2
161.925
53.975
55.1
42.862
6.4
3.3
400000
480000
47685/47620
82.55
133.35
33.338
33.338
26.195
0.8
3.3
185000
236000
JH415647/JH415610
75
145
51
51
42
3
2.5
350000
410000
837/832
76.2
168.275
53.975
56.363
41.275
0.8
3.3
425000
470000
47686/47620
82.55
133.35
33.338
33.338
26.195
3.5
3.3
185000
236000
34300/34478
76.2
121.442
24.608
23.012
17.462
2
2
104000
120000
843/832
76.2
168.275
53.975
56.363
41.275
6.4
3.3
425000
470000
47687/47620
82.55
133.35
33.338
33.338
26.195
6.8
3.3
185000
236000
42687/42620
76.2
127
30.162
31
22.225
3.5
3.3
170000
194000
9380/9321
76.2
171.45
49.212
46.038
31.75
3.5
3.3
315000
310000
HM516448/HM516410
82.55
133.35
39.688
39.688
32.545
6.8
3.3
221000
310000
42688/42620
76.2
127
30.162
31.001
22.225
6.4
3.3
170000
194000
9378/9320
76.2
177.8
55.562
50.8
34.925
3.5
3.3
315000
310000
495/493
82.55
136.525
30.162
29.769
22.225
3.5
3.3
160000
192000