Anchor Bolts: Types, Uses and How to Choose
Anchor bolts are the connection between a structure and its foundation, or between equipment and concrete. Choosing the wrong type can mean a loose anchor or a failed fixing. This guide explains the main types of anchor bolts and how to choose.
What Is an Anchor Bolt?
An anchor bolt is a fastener designed to attach an object to concrete, masonry or steel. Some are cast into concrete before it sets; others are installed into a drilled hole and expand to grip the base material.
Types of Anchor Bolts
L-shaped and J-shaped anchor bolts: cast into concrete for structural connections.
Wedge anchors: expand against the hole wall in concrete.
Sleeve anchors: a sleeve expands to grip concrete or masonry.
Toggle bolts: expand behind drywall for light loads.
How Anchor Bolts Work
Cast-in anchors rely on the bent end being embedded in concrete. Wedge and sleeve anchors rely on expansion: tightening the nut pulls a wedge or sleeve outward, pressing it against the hole wall. The holding power depends on concrete strength, hole size and embedment depth.
How to Choose the Right Anchor Bolt
Identify the base material: concrete, masonry or drywall.
Choose cast-in anchors for structural concrete connections.
Choose wedge or sleeve anchors for post-installed fixings.
Match the diameter and length to the load and embedment depth.
Use galvanized or stainless steel for outdoor and wet areas.
FAQ
What is the strongest type of anchor bolt?
Cast-in anchors generally give the highest capacity in structural concrete. Post-installed wedge anchors are strong but depend on correct installation.
Can anchor bolts be used in brick?
Only with anchors designed for masonry. Standard wedge anchors are intended for concrete.
Anchor Bolts for Concrete and Steel
SolidLink supplies anchor bolts and other fasteners in galvanized and stainless steel. Browse our bolts or fasteners category, or contact us for a quote.
