McGill 3/8" Anchor Grip Expansion Bolt, with the specified dimensions of 12mm x 40mm, is a mechanical fastener designed for securely attaching objects into solid base materials such as concrete, masonry, or solid brick.

Here's a breakdown of its specifications and typical characteristics:

• 3/8" (9.525mm) Nominal Bolt Diameter: This refers to the approximate diameter of the threaded bolt itself, which classifies its size.

• 12mm Drill Hole Diameter: The 12mm measurement indicates the specific diameter of the hole that needs to be drilled into the base material for proper installation. This is the outer diameter of the anchor sleeve before expansion.

• 40mm Length: This is the overall length of the anchor sleeve, determining the embedment depth into the substrate. This length is important for achieving the specified holding power for the anchor.

How it works:

Like other expansion anchors, this bolt operates on the principle of expansion. After a hole of the specified diameter and depth (12mm x 40mm in this case) is drilled, the anchor is inserted. As the bolt or nut is tightened, an internal wedge or cone pulls into a split sleeve or an expandable shell, forcing it outwards against the walls of the pre-drilled hole. This outward pressure creates a strong frictional lock, securely anchoring the object to the base material.

Key features and applications:

• Reliable Fastening: Provides solid holding power for medium-duty applications.

• Versatility: Suitable for use in various solid masonry materials, including concrete, stone, and solid brick.

• Installation: Requires a precisely drilled hole. The tightening action then sets the anchor.

• Material: Typically made from materials like zinc-plated carbon steel for general indoor applications, or stainless steel for increased corrosion resistance in specific environments.¹

   

Common applications for a 3/8" x 40mm expansion bolt include:

• Mounting shelves, cabinets, and fixtures.

• Securing conduit, pipes, and electrical boxes.

• Attaching brackets, railings, and signs.

• General construction and renovation projects requiring dependable anchors.