Throughbolts

Throughbolts - also known as expansion bolts or heavy-duty masonry anchors - are the high-capacity fixings used for structural connections in concrete, solid brick, and stone where the maximum available pull-out and shear load resistance is required. At the DIY Hardware Store, our throughbolts cover the sleeve anchor and wedge anchor formats used for heavy bracket mounting, structural steelwork connections, and machinery base fixing in demanding applications.

A throughbolt works by expanding a metal sleeve or wedge against the walls of the drilled hole as the bolt is tightened, developing high friction and mechanical bearing forces that resist both axial pull-out and lateral shear. For the highest loads, chemical anchor systems using resin injection into the drilled hole provide even greater capacity, but for the majority of structural bracket and equipment mounting applications, a correctly specified throughbolt in sound masonry delivers the required performance reliably and cost-effectively.

Available in M8, M10, and M12 diameters in zinc-plated and galvanised steel at the DIY Hardware Store, in lengths suited to embedding depths of 40mm to 100mm in masonry substrates.

  • Expansion sleeve or wedge locks into drilled masonry hole
  • High pull-out and shear resistance for structural connections
  • Suitable for concrete, solid brick, and natural stone
  • Used for structural brackets, steelwork, and machinery bases
  • M8, M10, and M12 diameters available
  • Zinc-plated and galvanised steel options