Bearing life in plain arithmetic: what L10 really promises
L10 is not the life of your bearing. It is the life that 90% of a large group of identical bearings will reach. Here…
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Choosing internal clearance: C2, CN, C3 or C4?
The clearance a bearing has on the shelf is not the clearance it runs with. Fits and temperature take some of it away. Choose…
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Grease or oil? Picking a lubricant by speed factor and viscosity
Most bearing failures start with the lubricant, not the steel. Two numbers — the speed factor and the viscosity ratio — settle most lubrication…
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Reading a failed bearing: six surfaces and what they tell you
A failed bearing is evidence. Before it goes in the scrap bin, the raceways can tell you whether the cause was load, lubrication, assembly…
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Mounting a bearing without damaging it
A bearing can lose most of its life in the first five minutes. Heat it properly, press on the right ring and keep it…
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Shaft and housing fits: why k5 and H7 appear on so many drawings
The ring that rotates relative to the load needs an interference fit. The other can slide. Everything else in fit selection follows from that…
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Sealed or shielded? 2RS, 2RSL and ZZ compared
Contact seals keep dirt out but cost speed and add friction. Shields run fast but let fine dust in. The right closure depends on…