Anchor Bolt

An anchor bolt, or simply an anchor, is a fastener that provides secure fixing of objects to vertical and horizontal bases. The name comes from the German word «anker» — “anchor.”

A standard anchor consists of an expansion sleeve and a stud threaded on one end and with a conical thickening on the other. In addition to the standard type, other modifications of these fasteners exist:

• drop-in anchors;
• wedge anchors;
• chemical anchors;
• foundation anchors.

Anchors for fastening thin sheet materials form a separate group.

The fastening method of an anchor bolt resembles the way a ship’s anchor grips the seabed: the anchor engages the walls of the mounting hole. In a standard anchor bolt, this function is performed by the petals at the bottom of the expansion sleeve. As the nut fitted on the threaded part of the stud is tightened, the stud moves lengthwise, and its conical end spreads the petals apart. Under the pressure of the cone, the petals press against the walls of the hole, and the fastener is securely fixed in the base.