This Single Expansion Anchor consists of three parts-- (A) a two-piece expansion shield held together by a steel band or wire, or interlocked by ears and lugs; and (B) an expander nut. The outer surface of the shield is designed with ribs or corrugations to resist turning. The nut is either conical or eliptical in shape so as to fit within the shield body.
Used in soft masonry with machine screws or machine bolts which are exposed to vibration or side pressure. The expander nut climbs the anchor bolt as it is tightened, expanding the shield body. The bolt can be removed and replaced without affecting the holding power of the anchor system. Can also be used in harder materials, including stone, brick or concrete.