SKRUV ELLER MUTTER OCH EN OFORLORBAR MELLANLEGGSBRICKA

摘要

A captive washer and threaded fastener combination. The washer has a non-planar apertured portion, for passage of a screw shank, which is plastically deformed on first tightening of the fastener. The plastic deformation causes further extending portions of the washer to engage a shoulder on the screw or nut, and hold the washer captive.