McGill 1/2" Anchor Grip Expansion Bolt, with the specified dimensions of 16.5mm x 50mm, is a type of mechanical anchor used for securely fastening objects into solid base materials like concrete, solid brick, or stone.¹

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

• 1/2" (12.7mm) Nominal Bolt Diameter: This refers to the approximate diameter of the threaded bolt itself, which defines its size classification.

• 16.5mm Drill Hole Diameter: The 16.5mm 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.

• 50mm Length: This is the overall length of the anchor sleeve, determining the embedment depth into the substrate. This length is crucial for achieving the specified holding power.

How it works:

Like other expansion anchors, this bolt operates on the principle of expansion. After a hole of the specified diameter and depth (16.5mm x 50mm 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:

• Robust Fastening: Provides strong holding power for medium to heavy-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 applications, or stainless steel for increased corrosion resistance in specific environments.

Common applications for a 1/2" x 50mm expansion bolt include:

• Mounting substantial shelves, cabinets, and fixtures.

• Anchoring machinery and equipment to concrete floors.²

   

• Securing handrails, brackets, and structural components.

• General construction and renovation projects requiring reliable, strong anchors.