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A wall hook in concrete block needs a hole sized for its anchor, drilled into sound material. The main choice is whether to use a plastic masonry anchor for a light load or a screw designed for masonry for a heavier one. Get that choice right first; an oversized or misplaced hole is difficult to fix.
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Choose the fastener before drilling
Check the hook’s mounting holes and the package instructions for the required screw size, drill-bit diameter, and minimum embedment. Those details vary by anchor. Don’t choose a bit by guessing from the screw’s outside diameter: many anchors need a specific hole size, and even a small mismatch can make them spin or fail to grip.
Concrete block has a solid outer shell and hollow sections, though some blocks are filled with grout. A hole near the center of a face may open into a cavity. For a light hook, a rated plastic masonry anchor can work in the block’s face shell. For heavier or frequently loaded hooks, use a concrete screw or another fastening system rated for the material and expected load. If the hook will hold something valuable, heavy, or capable of injuring someone if it falls, don’t rely on a generic load estimate: follow the fastener maker’s rating for hollow or solid masonry as applicable.
| Fastener | Good fit | Trade-off |
|---|---|---|
| Plastic masonry anchor with screw | Light-duty hooks in a sound block face | Inexpensive and simple, but limited holding strength; can loosen if the hole is oversized. |
| Concrete screw | Medium-duty fastening where the screw can engage solid masonry | Usually needs a precisely sized hole and enough solid material; a cavity can reduce its grip. |
| Toggle-style masonry anchor | Some hollow-block installations, when the anchor is designed for that wall and load | Needs room behind the face shell and a larger hole; not every design works in every block. |
For a basic hook, a masonry anchor and screw assortment is often enough. For a more demanding installation, compare fasteners specifically rated for concrete block rather than buying a larger plastic anchor and assuming size alone makes it stronger.
Gather the right tools
You’ll need a cordless hammer drill or a corded hammer drill, a sharp masonry bit in the diameter specified for your anchor, a pencil, tape measure, level, and a screwdriver. A regular drill can bore a small hole in softer masonry, but it may be slow; a hammer drill drives the bit forward as it rotates and is the practical choice for most concrete block. An impact driver is for turning fasteners, not drilling masonry holes. Don’t use one in place of a hammer drill.
Wear safety glasses and a suitable dust mask. Masonry dust is hazardous to breathe. Check for wiring and plumbing before drilling, especially near switches, outlets, and pipe runs. If you can’t establish a safe drilling location, stop rather than drilling blind.
Mark the hook location
Hold the hook where it will go and mark each mounting hole. Use a level for hooks with more than one screw. Keep holes away from the edge of a block, mortar joints, and damaged areas; a practical starting point is at least 1 inch from an edge, with more clearance preferred when the hook or load is heavy. If the hook’s base covers the marks, remove it and verify the spacing before drilling.
Avoid drilling into a mortar joint unless the fastener instructions specifically allow it. Mortar can be softer and more variable than the block face, so a screw that bites well in the unit may loosen in the joint.
Drill to the correct depth
Fit the specified masonry bit and set the drill to hammer mode if it has one. Measure the anchor’s required hole depth and mark that depth on the bit with tape, or use the drill’s depth stop. Drill perpendicular to the wall at a steady, moderate speed. Let the hammer action do the work; pushing hard can overheat the bit, widen the hole, or crack a thin face shell.
Ease off as the bit approaches the depth mark. If the bit suddenly breaks through into a hollow section, don’t keep drilling deeper in the hope of finding solid material. Stop and check whether the chosen anchor is suitable for a hollow block. A hole that is too shallow can prevent the anchor from seating; one that is too deep can leave it unsupported.
Clean the hole and attach the hook
Pull the bit out while it is still turning, then remove dust from the hole. Use a hand blower or vacuum; avoid blowing masonry dust toward your face. Dust left in the hole can keep an anchor from seating fully or interfere with a concrete screw’s grip.
Insert the anchor straight and tap it gently with a hammer until its rim is flush with the wall. If it won’t enter with light taps, check for debris or the wrong hole size rather than pounding hard. Position the hook and drive the screw by hand or with a drill on a low setting. Stop when the hook is snug. Overtightening can spin a plastic anchor, strip the masonry, or bend the hook’s mounting plate.
Check the installation
Pull the hook firmly by hand before hanging anything. It should not shift, spin, or pull away from the wall. If it does, remove the screw and inspect the hole. A spinning anchor usually means the hole is too large or damaged; don’t solve that by forcing in a larger screw unless the anchor maker specifies it. Move to fresh, sound masonry and drill a correctly sized hole, or select a fastening system designed for the block’s hollow or solid condition.
Load the hook gradually and stay within the fastener’s published rating for the wall material and installation. Ratings for solid concrete do not automatically apply to hollow concrete block. If you can’t confirm the block condition or the anchor’s suitability, choose a more conservative location or ask a qualified installer.