Wall plug for fixing bolts has inwardly projecting flange which spreads projections, with shoulders separated by grooves, to catch material surrounding plug on outside when bolt is inserted

摘要

The wall plug has a long, hollow body with longitudinal slots (2) and an opening (4) at one end. These are surrounded by a series of annular projections (3) with shoulders (5-7) separated by grooves (8) which spread to catch the material surrounding the plug. An inwardly projecting flange (11) inside the plug spreads the projections when a bolt is inserted.