Masonry and Concrete Anchors

Securely fasten objects to extremely hard or hollow surfaces with anchors

Masonry and Concrete Anchors

When you find it difficult to insert screws directly into a wall or other surface, firest insert an anchor before securing the screw. This guide will tell you the best type of anchor to use for your next home improvement project.

Tip: You will need to drill a pilot hole regardless of which type of anchor you select. Be sure to have plenty of extra bits on hand and use a can of compressed air or a blower to clean out the hole. Always wear safety goggles and a dust mask when drilling.

Loads

Anchors can hold as much weight as the wall they’re attached to can bear.

  • The shear load describes the amount of downward force gravity and the weight an object exerts on the anchor.
  • Tensile load is the amount of force required to pull the anchor straight out of the hole.
  • Static loads are created by objects that never move and constantly exert the same force.
  • Dynamic loads are created by objects that move or vibrate.
  • Impact loads are created when weight is increased suddenly.

Anchor Types & Features

Anchors are available in multiple varieties, including concrete screws, hammer-in anchors, lag shields, lead screw anchors, plastic wall plugs and more.

Concrete screws

  • Best for attaching furring strips, doors and electrical boxes in concrete, brick or blocks.
  • Feature alternating high and low threads with 
diamond-cut notches for extra holding power.
  • May be sealed to provide protection against 
corrosion.

Hammer-In anchors

  • Best for hanging furring strips and metal brackets in concrete, concrete block, mortar and brick.
  • Easy to install
  • Must be hammered into place
  • Avoid using in crumbly surfaces
  • Don't require a separate screw

Lag shields

  • Longer shields are best for use in hard masonry while shorter shields are better for softer materials.
  • Used in conjunction with lag bolts
  • Short shields work well on shallow surfaces
  • Long shields provide greater strength

Lead screw anchors

  • Best for securing light to medium loads in brick, concrete block and masonry.

Plastic wall plugs

  • Best for light-duty applications in masonry, such as towel bars, tool brackets and shower doors.
  • Require a pilot hole
  • Expand once inserted to prevent turning and pullout
  • Tapered ribs prevent twisting

Sleeve anchors

  • Best for medium-duty applications in concrete block.
  • Length is measured from the washer to the 
end of the anchor.
  • Sleeves pinch the side of the pilot hole and 
get tighter as the screw is driven into place.

Toggle bolts

  • Best for light to medium loads in hollow block.
  • Feature a set of wings that spring open once bolt has been placed in hole and screw has been tightened
  • Wings provide a brace against the backside of the wall for a secure hold.

Wedge anchors

  • Best for heavy-duty load applications in concrete blocks and thin-wall or solid concrete.
  • Length is measured from end to end
  • Stainless-steel expansion clip offers 
resistance to corrosion
  • Extremely strong
  • Once inserted, nearly impossible to remove

  • Use chemical and powder-actuated anchors when working with an extremely heavy object that requires an industrial-strength hold. These anchors are strengthened with chemicals – you will need special instruction on how to use them.
  • Antirotation fins prevent anchors from spinning while they are being inserted, which strengthens their hold
  • Use a hammer drill when installing anchors into hard surfaces such as stone, concrete and brick.