Screw-threaded fasteners.

摘要

Components (18, 20) can be secured together by means of a headed fastener comprising a threaded shank (14) and a locking portion in the form of a flared skirt (16) which depends from the shank root. One of the components (18) comprises a recess (24) into which the head can be received. Upon insertion of the fastener the skirt becomes expanded against a bottom wall (28) of the recess to engage a peripheral wall (30) of the recess to resist accidental unscrewing. The skirt becomes compressed between an undersurface (13) of the head and the bottom wall. The skirt may be of increasing thickness from the shank root to the skirt periphery.