NoWear Coated Bearings
Rolling elements and raceways carry a thin, hard carbon-based coating that keeps the surfaces apart when the oil film collapses. The coating is aimed squarely at smearing and adhesive wear rather than at fatigue life. SES holds the range as an authorised SKF distributor, covering coating type Diamond-like carbon based layer; thickness A few microns, dimensions unaffected; hardness Substantially harder than the bearing steel beneath; coated parts Rollers, balls or raceways to order. Executions include NoWear coated cylindrical roller bearings, NoWear coated deep groove ball bearings, NoWear coated angular contact ball bearings, executions with coated rolling elements only, among others. It is specified most often into lightly loaded cylindrical roller bearings in gearbox idler positions and wind and hydro gearbox high-speed shaft locations. Every part is genuine SKF through official channels, with designation, specification and options confirmed against your duty before it ships — supplied from Kolkata and our branch network, with breakdown cover that does not sit in an inbox.
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Coating
Carbon-based low friction layer
Target failure
Smearing, scuffing, adhesive wear
Applied to
Rolling elements, raceways or both
Envelope
Standard bearing dimensions retained
Where it runs.
You will find NoWear Coated Bearings in the parts of a plant where this particular duty actually occurs. In practice that means lightly loaded cylindrical roller bearings in gearbox idler positions, wind and hydro gearbox high-speed shaft locations, compressor and turbine bearings subject to start-stop cycling, and equally pump bearings that run for long periods at part load, machine tool spindles with intermittent oil supply, bearings on drives that idle with the load removed. What links them is the duty rather than the machine name — coating: Carbon-based low friction layer. If your installation is not on that list it matters less than you would think: the operating condition decides the specification. Send us the load, the speed, the running temperature and the environment it runs in, and we will match it to the right execution in the SKF range and confirm what is in stock.
Specify it against the duty.
Specification here follows the operating condition, not the catalogue. Roller bearing runs unloaded or lightly loaded at speed and the raceway shows smeared streaks — Coated rolling elements handle the sliding entry into the load zone that causes smearing. Fitting a heavier duty uncoated bearing makes the problem worse, because the extra rollers slide more. Machine cycles from stop to full speed several times a shift — Choose the coated execution rather than a thicker oil. Higher viscosity delays film build-up at start and the damage happens in the first few seconds of every start. Oil is contaminated with water and cannot be kept dry — The coating helps with surface distress but not with corrosion. Fix the water ingress or the raceway pits under the coating and lifts it off in flakes. Where two of those apply at once, specify for the harsher of the two — under-specifying is what puts the part back on the bench a month later. Send us the duty and we will confirm the execution.
Ordering this from SES.
Strip and inspect a coated bearing the same way as an uncoated one, but judge it on the coating, not the shine. A raceway that still looks grey and matt is doing its job; polished bright areas mean the layer has gone through and the clock has restarted.