Deep Groove Ball Bearings SKF 634 -2Z

SKF 634-2Z compact deep-groove ball bearing with a 4 mm bore, 16 mm outer diameter and sheet metal end shields on both sides for protected shaft mountings.

The single-row deep groove ball bearing 634 -2Z from SKF primarily accommodates radial loads as well as low axial forces in both directions. The rings and rolling elements are made of case-hardened standard roller bearing steel (100Cr6), guided by a sturdy sheet steel cage. With compact main dimensions of 4 x 16 x 5 mm, this miniature bearing is suitable for precision designs with very limited installation space. It is manufactured to the standard tolerance class P0/PN (corresponding to ABEC 1) with normal radial clearance for standard mounting conditions.

What is the 634-2Z deep groove ball bearing suitable for in practical applications?

Small shaft diameters require space-saving rolling bearing components with precise guidance. This size is primarily used in precision mechanical assemblies and compact devices where installation space is limited and smooth running is required. The cylindrical outer ring, without a groove or flange, fits precisely and flush into prepared housing bores. Within the permissible temperature range of -20 to +120 degrees, the rolling bearing retains its dimensional stability and reliably copes with a wide range of industrial operating conditions.

What advantages do the -2Z cover plates offer when making a selection?

The suffix ‘-2Z’ denotes cover plates mounted on both sides, made from profiled sheet steel. These gap seals help to protect the bearing interior from coarse dirt particles and reduce lubricant loss. As the sheet metal discs sit in front of the inner ring shoulder without making contact, no additional friction or heat build-up occurs. The component can therefore achieve similarly high speeds to an open bearing, whilst significantly reducing the need for external seals in the shaft design.