INSOCOAT Bearings
A standard bearing with a plasma-sprayed aluminium oxide layer on the outside diameter or the bore, sealed against moisture. The coating puts an insulating barrier in the current path while the running geometry stays exactly as the catalogue bearing. SES holds the range as an authorised SKF distributor, covering coating material Aluminium oxide, Al2O3; coating thickness Typically around 100 to 300 microns; coated variants VL0241 outer ring OD, VL2071 inner ring bore; withstand voltage Commonly 1 kV or 3 kV DC depending on execution. Executions include INSOCOAT deep groove ball bearings, coated OD, INSOCOAT cylindrical roller bearings, coated OD, INSOCOAT bearings with coated bore, high withstand voltage executions. It is specified most often into inverter-fed motors on ID and FD fans in boiler houses and slip-ring and squirrel-cage motors on mill main drives. 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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From integrated steel plants to power utilities and EPC majors — the works that cannot afford a counterfeit part specify through SES.
Coating
Plasma-sprayed aluminium oxide, sealed
Location
Outer ring OD or inner ring bore
Withstand
Rated in kV DC, per designation
Fitting
Handled as a normal bearing, same seats
Where it runs.
You will find INSOCOAT Bearings in the parts of a plant where this particular duty actually occurs. In practice that means inverter-fed motors on ID and FD fans in boiler houses, slip-ring and squirrel-cage motors on mill main drives, traction and auxiliary motors in loco sheds, and equally alternator bearings on diesel generating sets, large pump motors on raw water and slurry duty, motors retrofitted with variable speed drives on existing plant. What links them is the duty rather than the machine name — coating: Plasma-sprayed aluminium oxide, sealed. 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. Shaft voltage measured at the coupling exceeds the level the motor maker allows — Insulate at the non-drive end and earth the drive end. Insulating both ends leaves the current no path to earth except through the gearbox or the driven pump. Housing seat is a slack fit and the outer ring can creep — An OD-coated bearing is the wrong answer to a loose seat. The coating wears through at the creep point, the insulation is lost, and fluting starts in the same running hours as before. Machine is washed down or works in a humid coastal plant — Confirm the coating is the sealed execution. Moisture soaked into an unsealed ceramic layer drops the insulation resistance to near nothing while looking perfectly intact. 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.
Test the insulation after fitting, before the coupling goes on. A megger reading taken with the shaft already earthed through the driven machine tells you nothing, and that is the reading most sites end up recording.