Electrically Insulated Bearing 6213-J20B-C4 is Deep Groove Ball Bearing design. its dimension is 65×120×23mm, it has the same dimension and the same design with normal chrome steel 6213-C4 bearing. but the most different is 6213-J20B-C4 bearing with Aluminium Oxide Coating. the coating can Electrical Resistance Voltages up to 3000 V DC.
Electrically Insulated Bearing can protect the machine to be exposed to electrical current. In a worst-case scenario, this can damage raceways and rolling elements, which in turn, causes the motor or generator to fail prematurely and without warning. On top of the extra expenses incurred for repairs, this also means additional costs caused by machine downtime and the resulting production losses.
6213-J20B-C4 Insulated ball bearings are particularly versatile. They are simple in design, non-separable, suitable for high and very high speeds and are robust in operation, requiring little maintenance. Because deep groove ball bearings are the most widely used bearing type, they are available from EASIER in many designs, variants and sizes. For railway applications, single row deep groove ball bearings are used in traction motors, mainly as the locating bearing in combination with a non-locating cylindrical roller bearing. Many modern traction motor designs require electrical insulation.
In gearbox applications, deep groove ball bearings are used in the locating bearing position, especially for lighter loads. These bearings are also used in railway vehicles for auxiliary equipment like:
--- ventilators for traction motor cooling systems
--- motors for air compressors in brake systems
--- rotational converters
as well as for many other applications.
| Brass cages 
| Polymer cages | Steel cages |
Cage type | Riveted, ball centred | Riveted, outer ring centred | Snap-type, ball centred | Ribbon-type, ball centred | Riveted, ball centred |
Material | Machined brass | PA66, glass fibre reinforced | PA46, glass fibre reinforced | PEEK, glass fibre reinforced | Stamped steel |
Suffix | M | MA | TN9 | VG1561 | TNH | – | – |
Application | Traction motor | Gearbox | Auxiliary machines | Traction motor | Auxiliary machines |
Lubrication | Grease | Oil | Grease | Grease |
Single row deep groove ball bearings have deep, uninterrupted raceway grooves. These raceway grooves have a close osculation with the balls, enabling the bearings to accommodate radial loads and axial loads in both directions.
Single row deep groove ball bearings are available open or capped (with seals or shields). Open bearings that are also available capped may have recesses in the outer ring.
Sealing solutions
The most popular sizes of deep groove ball bearings can be obtained (supplied) capped with a seal or shield on one or both sides.
Selection guidelines for different sealing solutions under various operating conditions are listed in technical catalogues.
Shields
Bearings with shields are primarily intended for applications where the inner ring rotates.
Shields are fitted in the outer ring and do not make contact with the inner ring, but form a narrow gap with it. Shields are made of sheet steel.
Depending on the bearing design, series and size, XRB supplies shields in different designs. Shields identified by the designation suffix Z typically have an extension in the shield bore to form a long, narrow gap with the land of the inner ring shoulder. Some shields do not have the extension.
Non-contact seals
Bearings with non-contact seals can be operated at the same speeds as bearings with shields, but with improved sealing effectiveness.
The seals form an extremely narrow gap with the land of the inner ring shoulder.
Non-contact seals are made of oil and wear-resistant acrylonitrile-butadiene rubber (NBR) that is reinforced by a sheet steel insert.
CoatMaster deep groove ball bearings with a non-contact seal on one or both sides are identified by the designation suffix RZ or 2RZ.
Bearing Current
Electric Motors Operating on Line Voltage
Low-friction seals
Bearings with low-friction seals can accommodate the same speeds as bearings with shields, but with improved sealing effectiveness. The seals are practically non-contacting with a recess in the inner ring
shoulder.
Single row deep groove ball bearings with a low-friction seal on one or both sides are identified by the designation suffix RSL or 2RSL. The seals are made of oil and wear-resistant NBR that is reinforced with a sheet steel insert.
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