Deep Groove Ball Bearings SKF 6308 -ZNR

The SKF 6308-ZNR deep groove ball bearing, fitted with a snap ring and measuring 40x90x23 mm, provides compact axial retention whilst supporting radial loads.

The SKF 6308-ZNR single-row deep groove ball bearing combines radial load-carrying capacity with a space-saving axial locking mechanism. Manufactured from standard roller bearing steel (100Cr6), the bearing has a bore of 40 mm, an outer diameter of 90 mm and a width of 23 mm. The combination of a single-sided sheet metal cover and a ring groove with a snap ring in the outer ring simplifies mechanical engineering designs. Fitted with a sheet steel cage, this bearing is designed for temperatures ranging from -20 to +150 degrees.

In which installation scenarios does the 6308-ZNR deep groove ball bearing prove its worth?

This rolling bearing is primarily used in designs where the housing bores are machined through. Thanks to the integrated retaining ring, the bearing can be locked axially directly against the housing wall. This saves installation space and reduces manufacturing costs. The bearing primarily absorbs radial forces, but also guides shafts axially in both directions. The single-sided Z-cover plate protects the interior from dirt particles, whilst the open opposite side allows lubrication via the lubrication circuit if required.

What are the distinctive features of the design with a ring groove, snap ring and Z-cover plate?

The designator ZNR indicates two functional features relevant to design and assembly. The ‘Z’ stands for a non-abrasive cover plate made of sheet steel on one side of the bearing, which minimises friction and prevents lubricant loss. The designation ‘NR’ refers to the ring groove in the outer ring with a fitted retaining ring. This design secures the bearing positively in the housing without the need for retaining rings on the shaft or complex housing covers. With standard radial bearing clearance and standard tolerance P0 (ABEC 1), the component is suitable for standard fit seats.