Deep Groove Ball Bearings SKF 6303 -Z

The SKF 6303-Z single-row deep-groove ball bearing (17x47x14 mm) combines radial load-carrying capacity with one-sided protection against coarse contaminants.

The 6303-Z deep groove ball bearing is a versatile rolling bearing for industrial designs and repairs. With a bore of 17 mm, an outside diameter of 47 mm and a width of 14 mm, this design primarily accommodates radial loads as well as moderate axial loads in both directions. Manufactured from standard roller bearing steel 100Cr6 and fitted with a sheet steel cage, the component is designed for a temperature range of –20 to +150 degrees. It is manufactured to tolerance class P0/PN (ABEC 1).

What is the 6303-Z deep groove ball bearing suitable for in operation?

This deep groove ball bearing is primarily used in enclosed assemblies where lubricant is to reach the rolling elements from the open side, whilst the outer side remains protected from dirt. Thanks to its standard radial clearance, the component is suitable for typical fit conditions and standard operating temperatures. The cylindrical shape, without a flange or groove on the outer ring, facilitates fitting into flat housing bores in mechanical and plant engineering.

What is the function of the single-sided Z cover plate?

The suffix ‘-Z’ denotes a cover plate made of sheet steel, pressed in on one side, which acts as a non-contacting gap seal. This cover protects the raceway on one side against the ingress of solid contaminants without generating additional friction or heat. The opposite side remains open. This allows lubricant to be supplied from inside the housing or the condition of the bearing to be checked directly during maintenance work. Designers determine the installation direction so that the closed side faces the potential source of contamination.