Install these screws when you can only access one side of material. They're a higher-strength alternative to blind rivets. To install, hold the washer in place with a wrench, then use a hex socket to turn the screw. As the screw is tightened, the attached nut expands the sleeve to create a strong clamping force on the back of the material.

Head height does not include the washer. Length is measured from under the washer.

Also known as double expansion anchors, these expand from both sides for full contact with your hole’s walls. They’re often used to mount handrails, shelving, and light fixtures. Since the gripping force is distributed along the entire length of the anchor, it won’t crack soft materials like block and brick. You can use these anchors as an alternative to drop-in anchors in concrete near edges, corners, or other weak points, but they are not as strong.

To install, hammer into a drilled hole and position your component. Then, insert a screw or threaded rod and tighten. For maximum expansion, the anchor should protrude slightly above the surface before threading the screw. All create a permanent female-threaded connection that lets you remove and reinstall a screw or threaded rod. They cannot be used in overhead applications.

Install with the twist of a nut—no adhesive or special installation tool required. All of these anchors have a wedge-shaped base with expansion clips that widen against the hole’s sides, creating a tight grip for overhead use. They’re often used to suspend conduit, lighting, and pipes. Since the grip is focused at the base, these anchors are best suited for concrete, which can handle the gripping pressure better than softer block and brick. However, they are not as strong as our other anchors for concrete that are for overhead use.

To install, thread the anchor onto a threaded rod with a nut and washer. Then, tap into a drilled hole and turn the nut to expand the base. These anchors should be recessed—install to any depth greater than the minimum installation depth. Remove your component by unfastening the nut, but the anchor itself cannot be removed.

Remove the bolt to adjust, move, or replace components. Manufactured in the U.S. with Grade 5 steel, these anchors have over twice the shear strength of our wedge anchors, making them strong enough to secure highway barriers and train tracks. When you tighten them, the tapered bolt expands the nut, spreading the gripping force along its entire length. This creates the higher strength than wedge anchors, where the grip is focused at the wedge. These anchors are more forgiving of variations in hole precision than wedge anchors and require more torque to install. The increased torque puts stress on your base material, so don't use them near edges, corners, or in cracked surfaces.

To install, thread the nut onto the tapered bolt. Drive the anchor through your component into a drilled hole. Then, turn the bolt to expand the nut for a tight hold. You can repeatedly use the bolt in the same hole. To use the bolt in a new hole, a replacement expander nut (sold separately) is required.