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
47680/47620
76.2
133.35
33.338
33.338
26.195
0.8
3.3
185000
236000
34306/34478
77.788
121.442
24.608
23.012
17.462
3.5
2
110000
124000
580/572X
82.55
139.7
36.512
36.098
28.575
3.5
3.3
215000
260000
5760/5735
76.2
135.732
44.45
46.101
34.925
3.5
3.3
266000
340000
42690/42620
77.788
127
30.162
31
22.225
3.5
3.3
170000
194000
580/572
82.55
139.992
36.512
36.098
28.575
3.5
3.3
215000
260000
495A/493
76.2
136.525
30.162
29.769
22.225
3.5
3.3
160000
192000
5795/5735
77.788
135.733
44.45
46.101
34.925
3.5
3.3
266000
340000
495AX/493
76.2
136.525
30.162
29.769
22.225
6.4
3.3
160000
192000
661/653
79.375
146.05
41.275
41.275
31.75
3.5
3.3
254000
296000
575/572
76.2
139.992
36.512
36.098
28.575
3.5
3.3
215000
260000
750/742
79.375
150.089
44.45
46.672
36.512
3.5
3.3
325000
370000
6461/6420
76.2
149.225
53.975
54.229
44.45
3.5
3.3
335000
385000
JM515649/JM515610
80
130
35
34
28.5
3
2.5
205000
252000
590A/592A
76.2
152.4
39.688
36.322
30.162
3.5
3.2
225000
285000
496/493
80.962
136.525
30.162
29.769
22.225
3.5
3.3
160000
192000
659/652
76.2
152.4
41.275
41.275
31.75
3.5
3.3
254000
296000
581/572X
80.962
139.7
36.512
36.098
28.575
3.5
3.3
215000
260000
9285/9220
76.2
161.925
49.212
46.038
31.75
3.5
3.3
305000
290000
581/572
80.962
139.992
36.512
36.098
28.575
3.5
3.3
215000
260000
570/563
68.262
127
36.512
36.17
28.575
3.5
3.3
204000
234000
JM612949/JM612910
70
115
29
29
23
3
2.5
155000
177000
658/653X
74.612
150
41.275
41.275
31.75
3.5
3
254000
296000
H414245/H414210
68.262
136.525
41.275
41.275
31.75
3.5
3.3
282000
297000