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 75X85X25
75.0 mm
85.0 mm
25.0 mm
0.238 kg
IR 75X85X30
75.0 mm
85.0 mm
30.0 mm
0.287 kg
IR 25X29X30
25.0 mm
29.0 mm
30.0 mm
0.039 kg
IR 25X30X17
25.0 mm
30.0 mm
17.0 mm
0.0275 kg
IR 25X30X26.5
25.0 mm
30.0 mm
26.5 mm
0.043 kg
IR 35X40X30
35.0 mm
40.0 mm
30.0 mm
0.069 kg
IR 40X48X22
40.0 mm
48.0 mm
22.0 mm
0.094 kg
IR 40X50X20 IS1
40.0 mm
50.0 mm
20.0 mm
0.106 kg
IR 110X125X40
110.0 mm
125.0 mm
40.0 mm
0.84 kg
IR 45X50X35
45.0 mm
50.0 mm
35.0 mm
0.1 kg
IR 120X135X45
120.0 mm
135.0 mm
45.0 mm
1.0 kg
IR 50X55X20 IS1
50.0 mm
55.0 mm
20.0 mm
0.063 kg
IR 12X16X20
12.0 mm
16.0 mm
20.0 mm
0.014 kg
IR 5X8X12
5.0 mm
8.0 mm
12.0 mm
0.0028 kg
IR 12X16X22
12.0 mm
16.0 mm
22.0 mm
0.015 kg
IR 60X68X35
60.0 mm
68.0 mm
35.0 mm
0.213 kg
IR 17X20X20.5
17.0 mm
20.0 mm
20.5 mm
0.014 kg
IR 190X210X50
190.0 mm
210.0 mm
50.0 mm
2.41 kg
IR 200X220X50
200.0 mm
220.0 mm
50.0 mm
2.49 kg
IR 20X25X20.5
20.0 mm
25.0 mm
20.5 mm
0.028 kg