FF-C-77C, FEDERAL SPECIFICATION: CASTERS, RIGID AND SWIVEL (INSTITUTIONAL DUTY) (30-SEP-1986) [S/S BY S/S BY A-A-55617 AND A-A-55619]

FF-C-77C, FEDERAL SPECIFICATION: CASTERS, RIGID AND SWIVEL (INSTITUTIONAL DUTY) (30-SEP-1986) [S/S BY S/S BY A-A-55617 AND A-A-55619]., This specification covers rigid and swivel casters for institutional service. Casters are intended to be attached to equipment used in mess halls, kitchens, hospitals, and laboratories. Wide-faced wheels are recommended for use on soft or on rough surfaces. Soft treads should be used where quietness is required or shock and vibration are to be kept at a minimum. Hard treads are better suited for heavier loads. Larger diameter wheels are recommended for rough surfaces, door sills, or other places that cause shock. Polyurethane tread permits selection of small wheels to support a given load.