SKF 61901-2Z Metal Shielded Single Row Deep Groove Ball Bearing 12x24x6mm

The SKF 61901-2Z double-shielded deep groove ball bearing combines a 12mm bore with a compact 24mm outside diameter and just 6mm of axial width. Its thin-section 619 series construction is particularly useful where a conventional 6001 bearing, measuring 12 x 28 x 8mm, would occupy too much space. The single row deep groove raceways accommodate radial loads together with axial forces in either direction, within the bearing's rated capacity. SKF specifies a basic dynamic load rating of 2.91kN and a basic static load rating of 1.46kN, making accurate load assessment important when selecting this relatively small bearing. The compact cross-section is intended to meet space restrictions rather than maximise load capacity.

The 2Z designation identifies two non-contact metal shields, one on each side of the bearing. Unlike rubber contact seals, these shields leave a small clearance and generate minimal additional friction, making the design suitable for applications where rotational speed and smooth running are important. They help retain the factory grease and reduce the entry of larger airborne particles, but do not provide the same protection against water or fine contamination as contact seals. SKF lists a reference speed of 67,000rpm and a limiting speed of 32,000rpm; these are catalogue values, not guaranteed continuous operating speeds. With normal (CN) radial internal clearance and a sheet metal cage, the bearing requires appropriate shaft and housing fits. During replacement, confirm both the 61901 dimensions and the 2Z shielding arrangement.

Typical Applications:

Precision measuring instruments and mechanical assemblies

Compact electric motors operating in clean environments

Miniature automation and positioning mechanisms

Light-duty guide rollers and pulley systems

Slim rotating shaft supports in specialist machinery