Inner rings

SKF Inner Rings are precision-engineered core components of rolling bearings, designed to work in tandem with rolling elements (balls, rollers) and outer rings to enable smooth rotational motion under load. These critical components transfer radial and axial forces from rotating shafts to stationary housings while maintaining alignment and minimizing friction. Manufactured to exacting tolerances using advanced metallurgy, SKF inner rings ensure optimal bearing performance, longevity, and reliability across industries ranging from automotive and aerospace to heavy machinery and renewable energy systems.

Applications & Industry Use Cases

SKF Inner Rings are integral to rotating systems requiring precision and durability:

  1. Automotive Systems

Wheel Hub Units: High-precision inner rings for tapered roller bearings in passenger/EV vehicles.

Transmission Gearboxes: Carburized steel rings for high-cycle fatigue resistance.

  1. Industrial Machinery

Electric Motor Bearings: Low-noise designs for high-speed spindles.

Steel Rolling Mills: Extra-heavy-duty rings for 4-row cylindrical roller bearings.

  1. Aerospace & Defense

Jet Engine Shafts: Ceramic hybrid rings for high-temperature turbine applications.

Helicopter Rotor Systems: Corrosion-resistant stainless variants for marine operations.

  1. Renewable Energy

Wind Turbine Gearboxes: Large-diameter rings (500+ mm) for multi-MW generators.

Hydroelectric Generators: Water-resistant coatings for humid environments.

  1. Robotics & Automation

Precision Linear Guides: Miniature rings for high-accuracy motion systems.

Food Processing: FDA-compliant stainless steel rings for hygienic environments.

SKF Inner Rings represent the pinnacle of bearing component engineering, delivering unmatched precision, durability, and adaptability. From high-speed EV motors to gigawatt-scale wind turbines, these critical components ensure reliable power transmission while reducing maintenance costs and downtime. Backed by SKF’s global technical network and century-long expertise, they provide a future-proof solution for industries demanding peak performance in extreme operating conditions. Whether as standalone replacements or integrated into complete bearing assemblies, SKF Inner Rings exemplify engineering excellence and sustainable innovation

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Designation Bore diameter Outside diameter Width Mass
LR 12X15X22.5
12.0 mm
15.0 mm
22.5 mm
0.011 kg
LR 30X35X12.5
30.0 mm
35.0 mm
12.5 mm
0.023 kg
LR 20X25X16.5
20.0 mm
25.0 mm
16.5 mm
0.022 kg
LR 20X25X26.5
20.0 mm
25.0 mm
26.5 mm
0.036 kg
LR 30X35X20.5
30.0 mm
35.0 mm
20.5 mm
0.041 kg
LR 35X40X20.5
35.0 mm
40.0 mm
20.5 mm
0.046 kg
LR 45X50X25.5
45.0 mm
50.0 mm
25.5 mm
0.074 kg
LR 7X10X10.5
7.0 mm
10.0 mm
10.5 mm
0.003 kg
IR 17X21X16
17.0 mm
21.0 mm
16.0 mm
0.014 kg
IR 17X21X20
17.0 mm
21.0 mm
20.0 mm
0.018 kg
IR 45X50X25.5
45.0 mm
50.0 mm
25.5 mm
0.074 kg
IR 50X60X25 EGS
50.0 mm
60.0 mm
25.0 mm
0.086 kg
IR 55X63X25
55.0 mm
63.0 mm
25.0 mm
0.141 kg
IR 17X24X20
17.0 mm
24.0 mm
20.0 mm
0.034 kg
IR 60X70X25 EGS
60.0 mm
70.0 mm
25.0 mm
0.195 kg
IR 20X25X16 IS1
20.0 mm
25.0 mm
16.0 mm
0.0255 kg
IR 65X73X25
65.0 mm
73.0 mm
25.0 mm
0.164 kg
IR 300X330X80
300.0 mm
330.0 mm
80.0 mm
9.2 kg
IR 90X105X63
90.0 mm
105.0 mm
63.0 mm
1.11 kg
IR 65X75X28 EGS
65.0 mm
75.0 mm
28.0 mm
0.23 kg