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
366/362A
50
88.9
20.638
22.225
16.513
2.3
1.3
90000
85000
529X/522
50.8
101.6
34.925
36.068
26.988
3.5
3.3
169000
169000
JM205149/JM205110
50
90
28
28
23
3
2.5
128000
136000
HM807046/HM807011
50.8
104.775
36.512
36.512
28.575
3.5
0.8
164000
182000
JHM807045/JHM807012
50
105
37
36
29
3
2.5
164000
182000
HM807046/HM807010
50.8
104.775
36.512
36.512
28.575
3.5
3.3
164000
182000
L305649/L305610
50.8
80.962
18.258
18.258
14.288
1.5
1.5
65500
81000
59200/59429
50.8
108.966
34.925
36.512
26.988
3.5
3.3
178000
181000
LM104949/LM104911A
50.8
82.55
23.622
22.225
18.542
3.5
0.8
87500
96000
55200/55437
50.8
111.125
30.162
26.909
20.638
3.5
3.3
114000
110000
LM104949/LM104912
50.8
82.931
21.59
22.225
16.51
3.5
1.3
87500
96000
55200C/55437
50.8
111.125
30.162
26.909
20.638
3.5
3.3
101000
138000
46176/46368
44.45
93.662
31.75
31.75
26.195
3.5
3.3
129000
133000
17887/17831
45.23
79.985
19.842
20.638
15.08
2
1.3
76000
78500
55187/55437
47.625
111.125
30.162
26.909
20.638
3.5
3.3
114000
110000
438/432
44.45
95.25
27.783
29.901
22.225
3.5
2.3
131000
126000
LM102949/LM102910
45.242
73.431
19.558
19.812
15.748
3.5
0.8
66000
75000
HM804843/HM804810
44.45
95.25
30.162
29.37
23.02
3.5
3.3
130000
143000
LM603049/LM603011
45.242
77.788
19.842
19.842
15.08
3.5
0.8
69000
71000
53176/53375
44.45
95.25
30.958
28.301
20.638
1.3
0.8
102000
90000
LM603049/LM603012
45.242
77.788
21.43
19.842
16.667
3.5
0.8
69000
71000
53178/53375
44.45
95.25
30.958
28.301
20.638
2
0.8
96000
97000
25590/25520
45.618
82.931
23.812
25.4
19.05
3.5
0.8
94000
99000
53177/53375
44.45
95.25
30.958
28.301
20.638
3.5
0.8
102000
90000