Drop In anchors are concrete anchors with an internal thread designed for anchoring into concrete. Drop the anchor into the pre-drilled hole in the concrete. Using a setting tool expands the anchor within the hole in the concrete.
Internal thread = 10.0mm
Hole drill diameter = 12mm
Overall length = 40mm
However, to choose or install one correctly, three distinct measurements must be factored in:
1. Anchor Size (Internal Thread Diameter)The nominal size listed on the box (e.g., M10 or 3/8") always references the internal thread size. A matching bolt or threaded rod must be paired with this size.
2. Outside Diameter (Drill Bit Size)The outer body of the anchor is significantly thicker than the thread. A larger drill bit matching the anchor's Outside Diameter (OD) is required to drill the hole:
Metric Example: An M10 drop-in anchor typically features an outside diameter of 12mm, requiring a 12mm drill bit.
3. Anchor Length (Hole Depth)Drop-in anchors are flush-mount fasteners. The overall length of the metal casing dictates the minimum depth the hole must be drilled
