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 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 35X42X36
35.0 mm
42.0 mm
36.0 mm
0.117 kg
IR 38X43X30
38.0 mm
43.0 mm
30.0 mm
0.074 kg
IR 40X45X30
40.0 mm
45.0 mm
30.0 mm
0.077 kg
IR 50X55X25
50.0 mm
55.0 mm
25.0 mm
0.078 kg
IR 50X55X35
50.0 mm
55.0 mm
35.0 mm
0.112 kg
IR 50X58X40
50.0 mm
58.0 mm
40.0 mm
0.209 kg
IR 60X68X25
60.0 mm
68.0 mm
25.0 mm
0.152 kg
IR 6X10X10 IS1
6.0 mm
10.0 mm
10.0 mm
0.004 kg
IR 7X10X10.5
7.0 mm
10.0 mm
10.5 mm
0.003 kg
IR 7X10X16
7.0 mm
10.0 mm
16.0 mm
0.005 kg
IR 28X32X30
28.0 mm
32.0 mm
30.0 mm
0.044 kg
IR 8X12X10 IS1
8.0 mm
12.0 mm
10.0 mm
0.0046 kg
IR 30X35X16
30.0 mm
35.0 mm
16.0 mm
0.031 kg
IR 95X110X35
95.0 mm
110.0 mm
35.0 mm
0.643 kg
IR 30X35X20
30.0 mm
35.0 mm
20.0 mm
0.0396 kg
LR 25X30X16.5
25.0 mm
30.0 mm
16.5 mm
0.0279 kg
IR 30X35X20.5
30.0 mm
35.0 mm
20.5 mm
0.0396 kg
IR 100X110X30 EGS
100.0 mm
110.0 mm
30.0 mm
0.381 kg