McGill 1/4" Anchor Grip Expansion Bolt, with dimensions of 8.5mm x 25mm, is a mechanical fastener designed for light to medium-duty applications in solid base materials such as concrete, solid brick, or stone.

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

• 1/4" (6.35mm) Nominal Diameter: This refers to the approximate diameter of the threaded portion of the bolt.

• 8.5mm Drill Hole Diameter: The 8.5mm measurement indicates the precise diameter of the hole that needs to be pre-drilled into the base material for proper installation of the anchor.

• 25mm Length: This is the overall length of the anchor, which determines the embedment depth into the substrate. A 25mm length suggests it's designed for relatively shallow embedment, suitable for lighter loads.

How it works:

Like other expansion bolts, this anchor functions by expanding within the pre-drilled hole. As the bolt is tightened (usually by turning a nut), an internal cone or wedge pulls into a split sleeve, forcing it outwards against the walls of the hole. This creates a strong, secure frictional lock, holding the fastened object in place.1

Common applications:

Given its size, this anchor is suitable for a range of smaller fastening tasks, including:

• Mounting light fixtures, wall decor, and small shelves.

• Securing electrical boxes, conduit clips, and pipe clamps to masonry.

• Attaching signage or small brackets.

• General light-duty fastening in concrete or solid brick walls and floors.

Material:

These anchors are commonly made from zinc-plated carbon steel, offering basic corrosion resistance for indoor or dry environments.2