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 40X45X16.5
40.0 mm
45.0 mm
16.5 mm
0.041 kg
IR 12X16X12 IS1
12.0 mm
16.0 mm
12.0 mm
0.008 kg
IR 15X20X12 IS1
15.0 mm
20.0 mm
12.0 mm
0.012 kg
IR 22X28X20
22.0 mm
28.0 mm
20.0 mm
0.035 kg
IR 25X30X16 IS1
25.0 mm
30.0 mm
16.0 mm
0.026 kg
IR 25X30X32
25.0 mm
30.0 mm
32.0 mm
0.053 kg
IR 280X305X69
280.0 mm
305.0 mm
69.0 mm
6.1 kg
IR 30X37X22
30.0 mm
37.0 mm
22.0 mm
0.061 kg
IR 55X65X28 EGS
55.0 mm
65.0 mm
28.0 mm
0.198 kg
IR 70X80X25 EGS
70.0 mm
80.0 mm
25.0 mm
0.224 kg
LR 10X13X12.5
10.0 mm
13.0 mm
12.5 mm
0.0052 kg
LR 20X25X20.5
20.0 mm
25.0 mm
20.5 mm
0.028 kg
LR 25X30X26.5
25.0 mm
30.0 mm
26.5 mm
0.043 kg
LR 25X30X38.5
25.0 mm
30.0 mm
38.5 mm
0.064 kg
LR 30X35X12.5
30.0 mm
35.0 mm
12.5 mm
0.023 kg
LR 8X12X10.5
8.0 mm
12.0 mm
10.5 mm
0.005 kg
IR 12X15X16.5
12.0 mm
15.0 mm
16.5 mm
0.008 kg
IR 15X18X16
15.0 mm
18.0 mm
16.0 mm
0.01 kg
IR 17X24X20
17.0 mm
24.0 mm
20.0 mm
0.034 kg
IR 20X25X16 IS1
20.0 mm
25.0 mm
16.0 mm
0.0255 kg
IR 300X330X80
300.0 mm
330.0 mm
80.0 mm
9.2 kg
IR 65X75X28 EGS
65.0 mm
75.0 mm
28.0 mm
0.23 kg
IR 9X12X12
9.0 mm
12.0 mm
12.0 mm
0.005 kg
LR 20X25X16.5
20.0 mm
25.0 mm
16.5 mm
0.022 kg