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 40X45X20.5
40.0 mm
45.0 mm
20.5 mm
0.053 kg
LR 35X40X16.5
35.0 mm
40.0 mm
16.5 mm
0.037 kg
LR 12X15X12.5
12.0 mm
15.0 mm
12.5 mm
0.006 kg
LR 17X20X20.5
17.0 mm
20.0 mm
20.5 mm
0.014 kg
LR 17X20X30.5
17.0 mm
20.0 mm
30.5 mm
0.021 kg
LR 30X35X16.5
30.0 mm
35.0 mm
16.5 mm
0.031 kg
LR 50X55X20.5
50.0 mm
55.0 mm
20.5 mm
0.064 kg
IR 130X145X35
130.0 mm
145.0 mm
35.0 mm
0.851 kg
IR 130X145X35 EGS
130.0 mm
145.0 mm
35.0 mm
0.855 kg
IR 140X155X35
140.0 mm
155.0 mm
35.0 mm
0.917 kg
IR 15X19X16
15.0 mm
19.0 mm
16.0 mm
0.013 kg
IR 15X19X20
15.0 mm
19.0 mm
20.0 mm
0.016 kg
IR 22X26X20
22.0 mm
26.0 mm
20.0 mm
0.023 kg
IR 45X55X20 IS1
45.0 mm
55.0 mm
20.0 mm
0.117 kg
IR 320X350X80
320.0 mm
350.0 mm
80.0 mm
9.8 kg
IR 50X60X20 IS1
50.0 mm
60.0 mm
20.0 mm
0.129 kg
IR 38X43X20
38.0 mm
43.0 mm
20.0 mm
0.048 kg
IR 5X8X16
5.0 mm
8.0 mm
16.0 mm
0.004 kg
IR 8X12X10.5
8.0 mm
12.0 mm
10.5 mm
0.005 kg
IR 95X105X36
95.0 mm
105.0 mm
36.0 mm
0.43 kg