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
344A/332
40
80
21
22.403
17.826
0.8
1.3
84000
75500
3576/3525
41.275
87.312
30.162
30.886
23.812
0.8
3.3
118000
120000
16986/16929
43
74.988
19.368
19.837
14.288
1.5
1.3
64500
68000
344/332
40
80
21
22.403
17.826
3.5
1.3
84000
75500
44162/44348
41.275
88.501
25.4
23.698
17.462
2.3
1.5
85000
75500
13175/13318
44.45
80.962
19.05
17.462
14.288
0.3
1.5
55500
57000
44157/44348
40
88.501
25.4
23.698
17.462
2.3
1.5
85000
75500
HM803145/HM803110
41.275
88.9
30.162
29.37
23.02
0.8
3.3
118000
129000
LM300849/LM300811
41
68
17.5
18
13.5
SPEC
1.5
53500
58000
HM803146/HM803110
41.275
88.9
30.162
29.37
23.02
3.5
3.3
118000
129000
18590/18520
41.275
73.025
16.667
17.462
12.7
3.5
1.5
55000
54000
4388/4335
41.275
90.488
39.688
40.386
33.338
3.5
3.3
171000
180000
LM501349/LM501310
41.275
73.431
19.558
19.812
14.732
3.5
0.8
67000
67000
46162/46368
41.275
93.662
31.75
31.75
26.195
0.8
3.3
135000
142000
LM501349/LM501314
41.275
73.431
21.43
19.812
16.604
3.5
0.8
67000
67000
HM804840/HM804810
41.275
95.25
30.162
29.37
23.02
3.5
3.3
130000
143000
11162/11300
41.275
76.2
18.009
17.384
14.288
1.5
1.5
52000
51000
53162/53387
41.275
98.425
30.958
28.301
20.638
1.5
0.8
96000
97000
24780/24720
41.275
76.2
22.225
23.02
17.462
3.5
0.8
81000
82000
12168/12303
42.862
76.992
17.462
17.145
11.908
1.5
1.5
54000
54000
HM89446/HM89410
34.925
76.2
29.37
28.575
23.02
3.5
3.3
96500
106000
44143/44348
36.512
88.501
25.4
23.698
17.462
2.3
1.5
89500
81000
HM801346/HM801310
38.1
82.55
29.37
28.575
23.02
0.8
3.3
107000
117000
31594/31520
34.925
76.2
29.37
28.575
23.812
1.5
3.3
99000
96500