Deep Groove Ball Bearings SKF 6308 -2Z

The 6308-2Z deep-groove ball bearing, measuring 40x90x23 mm, features sheet metal shields on both sides to protect against dirt particles at high speeds.

The 6308-2Z deep groove ball bearing from SKF is a single-row bearing designed primarily for radial loads and moderate axial forces in both directions. With a bore of 40 mm, an outer diameter of 90 mm and a width of 23 mm, it complies with standard dimensions. Manufactured in the SKF Explorer performance class from 100Cr6 rolling bearing steel, this bearing is characterised by smooth running and dimensional accuracy to tolerance class P0 (ABEC 1).

What operating conditions does the 6308-2Z deep groove ball bearing require?

This deep-groove ball bearing is suitable for applications where smooth running at constant speeds is required. The bearing absorbs radial forces and guides shafts axially within standard tolerances. Thanks to its standard radial clearance, it is suitable for operating temperatures between –20 and +120 degrees without excessive thermal expansion. Designs involving higher temperature differentials or heavy impact loads, however, require special designs.

What protection do the cover plates on both sides (-2Z) provide?

The designation -2Z stands for two non-contacting cover plates made of pressed sheet steel, which are fixed to both sides of the outer ring. This gap cover keeps larger foreign particles and coarse dust out of the bearing interior without causing additional friction or heat build-up on the shaft. This allows high rotational speeds to be maintained. For damp environments or direct contact with water spray, however, sliding seals are recommended, as gap seals do not form a complete liquid barrier.