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
IR 110X120X30
110.0 mm
120.0 mm
30.0 mm
0.409 kg
IR 12X15X12
12.0 mm
15.0 mm
12.0 mm
0.0058 kg
IR 17X20X16
17.0 mm
20.0 mm
16.0 mm
0.011 kg
IR 50X58X22
50.0 mm
58.0 mm
22.0 mm
0.113 kg
IR 17X20X16.5
17.0 mm
20.0 mm
16.5 mm
0.0108 kg
IR 60X70X25
60.0 mm
70.0 mm
25.0 mm
0.195 kg
IR 17X20X20
17.0 mm
20.0 mm
20.0 mm
0.014 kg
IR 60X70X28
60.0 mm
70.0 mm
28.0 mm
0.216 kg
IR 17X22X13
17.0 mm
22.0 mm
13.0 mm
0.015 kg
IR 65X73X35
65.0 mm
73.0 mm
35.0 mm
0.232 kg
IR 17X22X16
17.0 mm
22.0 mm
16.0 mm
0.0187 kg
IR 20X25X20
20.0 mm
25.0 mm
20.0 mm
0.028 kg
IR 20X25X26.5
20.0 mm
25.0 mm
26.5 mm
0.036 kg
IR 22X28X17
22.0 mm
28.0 mm
17.0 mm
0.03 kg
IR 25X29X20
25.0 mm
29.0 mm
20.0 mm
0.026 kg
IR 30X35X30
30.0 mm
35.0 mm
30.0 mm
0.0586 kg
IR 32X37X30
32.0 mm
37.0 mm
30.0 mm
0.063 kg
IR 35X40X20
35.0 mm
40.0 mm
20.0 mm
0.0455 kg
IR 35X40X20.5
35.0 mm
40.0 mm
20.5 mm
0.046 kg
IR 35X42X20 IS1
35.0 mm
42.0 mm
20.0 mm
0.064 kg