SKF IR 50X55X20 IS1 inner ring
- Brand
- SKF
- Category
- Bearings
- Subcategory
- Inner ring
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Description
SKF IR 50X55X20 IS1 belongs to inner ring, part of our Bearings range. Tell us how many you need by WhatsApp or email and we'll get back to you promptly with a quote for IR 50X55X20 IS1 and any equivalents.
When a shaft is too soft or its surface is not ground, a needle roller bearing cannot run directly on it. The SKF IR/IS inner ring solves this by pressing onto the shaft and giving the needles a hardened, accurately finished raceway. MR Industrial Accessories LLC supplies this SKF line to maintenance and purchasing teams across the United States, Canada, Mexico and South America.
The part number itself tells you the size. Take IR 40X50X20 IS1: IR means inner ring, and the three figures that follow are the bore, the outside diameter and the width in millimeters, in that order, separated by X. So this ring has a 40 mm bore, a 50 mm outside diameter and a 20 mm width. The IS1 ending marks a design variant, usually tied to a lubrication feature or a groove. Reading the code this way lets you confirm a replacement without opening a catalog.
Typical users are machine tools, pumps, compressors, gearboxes and other transmission equipment, plus automotive work. In plant maintenance, these rings show up whenever a shaft cannot be reworked to the hardness or finish a needle roller bearing needs. Fitting one gives the bearing the raceway it expects, so the assembly can carry its rated load over its intended service life.
Selection comes down to three checks. The ring bore has to equal the shaft diameter, the ring outside diameter has to equal the bore of the needle roller bearing it will run against, and the ring width has to suit both the bearing width and the space you have. At mounting, keep the ring aligned and free of impact damage, since the raceway surface is what the needles ride on. Correct lubrication and sealing protect that surface over time.
Rings built to the same standardized dimensions from other makers can serve as equivalents, but tolerances and heat treatment are worth confirming before you commit, because both affect how the assembly performs. For critical equipment, review the technical data first. If you are unsure which ring fits, send the part number or your measurements by WhatsApp or email and the team will help you choose and suggest equivalents.
MR Industrial Accessories LLC quotes on request: send the part number through WhatsApp or email and you will get a prompt reply.
Dimensions
Dimensions and tolerances: Message us the part number on WhatsApp and we'll verify its dimensions and version with the manufacturer's datasheet.
Frequently asked questions
- What does the IS1 suffix indicate on an SKF inner ring?
- It identifies a specific design variant, which may involve a lubrication groove or a particular surface treatment. Check the product data sheet or ask our team for the exact characteristics of that variant.
- Can an SKF inner ring run with a needle roller bearing from a different maker?
- It can, provided the dimensions and tolerances line up. These rings follow international standards, so they are generally interchangeable with bearings meeting the same specifications. Confirm the bore, outside diameter and width before fitting.
- How do I work out which inner ring my application needs?
- Measure the shaft diameter and the bore of the needle roller bearing. The ring bore must match the shaft, and its outside diameter must match the bearing bore. Factor in the bearing width as well. Send us the measurements if you want a second opinion.