FAG Germany Current-insulated bearings

2015-08-24

Current-insulated bearings have either an outer ring (J20 A, J20 AA, J20B) or an inner ring (J20C) that is

insulated with thin ceramic coating. Different coating types are available for optimum functional performance.

Types of coatings - Range of Sizes

ITEM	J20B	J20A	J20AA	J20C
Disruptive Voltage	500 VDC	1000 VDC	3000 VDC	3000 VDC
Environment	dry	dry	dry/damp	dry/damp
Coating Thickness	<100 μm	>200 μm	≈200 μm	≈200 μm
Applicable size	70-1400 mm outside diameter	70-1400 mm outside diameter	70-500 mm outside diameter	70-340 mm inner ring bore
Preferably used for bearings with an outside diameter of at least 500 mm

Current-insulated bearings have the same dimensions and load carrying capacities as those without

insulation, which makes them perfectly interchangeable. The most common type of insulation used in electric

motor applications is the J20AA coating. It offers excellent protection against passage of electrical current,

even in damp atmospheres. Bearings with ceramic coating are available with seals also. Bearings with J20C

coating on the inner ring are used in special applications as well as applications where the outer ring rotates.

Z shields can be used as well.

Ordering examples:

Deep groove ball bearing with a coated outer ring, with seals on both sides and radial clearance C3.

Cylindrical roller bearings with a coated outer ring and radial clearance C4.

6330-J20C -C3

Deep groove ball bearings with a coated inner ring and radial clearance C3.