SKF 61803-2Z Metal Shielded Single Row Deep Groove Ball Bearing 17x26x5mm

The SKF 61803-2Z shielded deep groove ball bearing belongs to the extra-thin 618 series, making it an excellent option for precision assemblies where a 17mm shaft must be supported within a housing diameter of just 26mm. Its 5mm axial width allows installation in particularly shallow bearing seats. Compared with the 61903 bearing, which measures 17 x 30 x 7mm, the 61803 occupies less radial and axial space but has a lower load capacity. Its single row deep groove raceways accommodate radial loads and limited axial loads in either direction. SKF catalogue specifications give a basic dynamic load rating of 2.03kN and a basic static load rating of 1.27kN, making accurate load assessment important for this lightweight bearing.

The 2Z suffix denotes two non-contact metal shields, one on each side of the bearing. These help retain the factory-applied grease and provide protection against larger airborne particles without the additional rubbing friction of contact rubber seals. The shielded design is therefore useful where low running resistance and rotational speed are priorities, although it offers less protection against water and fine contamination than the 2RS1 sealed alternative. SKF lists a reference speed of 56,000rpm and a limiting speed of 28,000rpm; these figures serve different purposes and should not be treated as interchangeable continuous operating limits. Normal (CN) radial internal clearance and the bearing's thin cross-section call for careful mounting, controlled fitting forces and correctly supported shaft and housing shoulders. Always check the complete suffix when selecting a replacement.

Typical Applications:

Precision measuring instruments and compact mechanisms

Miniature electric drive and actuator assemblies

Light-duty guide rollers and positioning equipment

Compact robotics and automation mechanisms

Enclosed shaft supports with 5mm-wide bearing seats