The ESA was the original internally threaded mechanical anchor design. The malleable lead shield allows for secure mounting.
Cone: Die-cast Zamac 3 alloy; expander shield: 3–5% antimonial lead
Drill a hole in the base material using the appropriate-diameter carbide drill bit as specified in the table. Drill the hole to the specified embedment depth plus 1/8" for flush mounting. Blow the hole clean using compressed air. Overhead installations need not be blown clean.
Insert anchor into hole.
Using a piloted setting punch, drive expander shield over cone.
Position fixture, insert fastener and tighten.
Meets Federal Specifications A-A-1922A, Type 1, except ESA50.