Overgreasing Kills Bearings Faster Than Running Dry
Packing a bearing full of grease churns heat and blows seals. Fill rules for 2RS vs open housings, and why a grease gun should sometimes stay on th...
Knowledge Center
Everything you need to spec, source, and maintain industrial bearings — in one place. Search the Apollo Bearing Index, read our technical guides and reference charts, and download manufacturer catalogs from the brands we stock.
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Apollo Bearing Index
Find bearing interchanges and cross-references, decode part numbers, or search by dimensions and equipment.
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Manufacturer Catalogs
Browse product catalogs, interchange guides and reference documents from the brands we stock.
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From our blog
Bearing Knowledge & Guides
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Soft Foot: Why the Laser Says You're Aligned and the Bearing Still Dies
Soft foot bends the frame into a green laser reading and cocks rigid motor bearings. Check each foot first, then align.
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Why You Shouldn't Reuse a Bearing After You Pull It
A pulled bearing that still spins on the bench is already damaged. Scrap it, measure the seats, and Speedi-Sleeve a grooved seal track — a Speedi-S...
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Stop Guessing Alignment: Acoem and SKF Tools We Stock for Shafts, Belts, and Vibration
When to grab Acoem ECO Pro, AT-200, Belt Hog, Bearing Defender, or an SKF TKSA, especially TKSA 51.
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Why Belt Drives Kill Bearings Faster Than Direct Drive (and How to Spec Around It)
Belt tension is a continuous overhung radial load. Same 6208, different life. Spec up, tension to a number, and align the grooves.
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Shaft Fit vs Housing Fit: The Spec That Decides Bearing Life
The ring that rotates relative to the load needs an interference fit. The other ring needs room. Fit decides residual clearance and heat.
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How Ball Bearings Are Made: From Steel Bar to Precision Part
A standard 6204 ball bearing costs less than lunch, yet its raceways are ground to tolerances measured in millionths of a meter — tighter tha...
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SKF Speedi-Sleeve Size Chart: Find Your Sleeve by Shaft Diameter
A worn seal groove doesn't mean a new shaft. An SKF Speedi-Sleeve presses over the worn sealing surface in minutes and gives your new seal a per...
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Roller Bearings vs Ball Bearings: How to Choose the Right Type
Every rolling bearing does the same job — replacing sliding friction with rolling friction — but ball bearings and roller bearings do it very...
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Sealed vs Shielded Bearings (2RS vs ZZ): Which Should You Choose?
Buy the same 6204 bearing from the same brand and you'll still face one choice: sealed (2RS) or shielded (ZZ)? The closure you pick decides h...
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Bearing Lubrication 101: Choosing Between Grease and Oil
Why Lubrication Is the Whole Ballgame Quick answer: Grease is the practical default for many applications because it stays in place and excludes c...
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The Complete Bearing Maintenance Checklist: Daily, Weekly, and Seasonal Tasks
Why a Maintenance Schedule Matters Quick answer: Check noise, vibration, temperature, leaks, and guards daily. Inspect seals, lubricant, and shaft...
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