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.

MORE +
CLOSE +
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
99587/99100
149.225
254
66.675
66.675
47.625
7
3.3
635000
830000
99600/99100
152.4
254
66.675
66.675
47.625
7
3.3
635000
830000
46780/46720
158.75
225.425
41.275
39.688
33.338
3.5
3.3
295000
540000
L327249/L327210
133.35
177.008
25.4
26.195
20.638
1.5
1.5
153000
258000
67780/67720
165.1
247.65
47.625
47.625
38.1
3.5
3.3
400000
645000
48385/48320
133.35
190.5
39.688
39.688
33.338
3.5
3.3
265000
440000
JHM534149/JHM534110
170
230
39
38
31
3
2.5
340000
520000
67390/67322
133.35
196.85
46.038
46.038
38.1
3.5
3.3
355000
505000
JM734449/JM734410
170
240
46
44.5
37
3
2.5
470000
720000
74525/74850
133.35
215.9
47.625
47.625
34.925
3.5
3.3
355000
495000
67787/67720
174.625
247.65
47.625
47.625
38.1
3.5
3.3
400000
645000
48393/48320
136.525
190.5
39.688
39.688
33.338
3.5
3.3
265000
440000
36990/36920
177.8
227.012
30.162
30.162
23.02
1.5
1.5
215000
395000
74537/74856
136.525
217.488
47.625
47.625
34.925
3.5
3.3
355000
495000
67790/67720
177.8
247.65
47.625
47.625
38.1
3.5
3.3
400000
645000
LM328448/LM328410
139.7
187.325
28.575
29.37
23.02
1.5
1.5
189000
305000
M236849/M236810
177.8
260.35
53.975
53.975
41.275
3.5
3.3
560000
835000
74550/74850
139.7
215.9
47.625
47.625
34.925
3.5
3.3
355000
495000
JM738249/JM738210
190
260
46
44
36.5
3
2.5
455000
730000
99550/99100
139.7
254
66.675
66.675
47.625
7
3.3
635000
830000