How to Mount Shelf on Wall | Studs, Anchors, and Keyhole Slots

Mounting a shelf on a wall requires finding studs or using the correct anchors for your wall type, then leveling, drilling pilot holes, and securing the hardware before hanging the shelf flush.

The right way to mount a shelf comes down to what’s behind the drywall. Screwing directly into a wood stud is always strongest, but plastic anchors sized for the load and wall type work fine when no stud sits where you need it. IKEA’s wall-shelf guidance splits walls into three cases—drywall with a wood stud, drywall without a stud, and masonry—and each takes a different fastener. IKEA also notes that needed wall plugs or screws may not be included with the shelf, so check the box before starting.

The general sequence applies to nearly every shelf: hold it in place, mark hole spots, check level, drill pilot holes, insert anchors if needed, drive screws, then hang the shelf and tighten. Below are specifics for studs, drywall, and the keyhole and bracket designs found on IKEA shelves.

Locating Studs and Choosing Anchors

A stud finder is fastest for locating wood framing behind drywall. Knocking also works—a solid, dull sound means a stud; a hollow sound means empty cavity. Once found, drive a screw directly in with no anchor needed. IKEA specifies a 5 mm screw for stud mounting.

For drywall without a stud, use plastic anchors or plugs sized for the wall type and expected load. IKEA lists an 8 mm plug plus screw for non-stud mounting in drywall or plaster. For masonry—brick, block, or concrete—use masonry anchors or plugs rated for that material, often requiring a hammer drill. The wrong fastener is the most common cause of a shelf pulling out.

The Keyhole Slot Method: Step-by-Step

Many wood shelves, including several IKEA models, hang on keyhole slots that slide over screw heads. Mark insertion points correctly, and it’s straightforward.

1. Hold the shelf at the desired height and mark the top outside corners with a pencil.
2. Measure down and in from those corners to locate keyhole insertion points on the shelf’s back, then transfer measurements to the wall.
3. Hold a carpenter’s level across your marks and confirm the line is horizontal.
4. Drill 3/16 inch pilot holes; for drywall, insert plastic anchors flush with the wall surface.
5. Drive screws into anchors, leaving heads about 1/2 inch protruding.
6. Lower the shelf onto screw heads so slots catch, then tighten until the shelf sits flush and stable.

That half-inch clearance lets the keyhole slot catch cleanly. Screws too deep won’t hang; too far out, and the shelf rocks.

Bracket-Mounted Shelves: IKEA LACK and KUNGSFORS

Visible-bracket shelves follow a different sequence, but the principles hold. The IKEA LACK is assembled with its mounting plate, held at height, leveled, and marked through the plate’s holes. After drilling and inserting anchors if needed, secure through the plate into the wall.

The IKEA KUNGSFORS attaches to wall brackets instead: fasten brackets to the shelf first, position the unit, mark wall bracket locations, screw them in with wall-appropriate fasteners, then slide the shelf on and secure it.

IKEA’s guidance notes some shelves should use brackets wherever possible for extra stability, and masonry, non-stud drywall, and plaster each need different hardware. If your wall type isn’t clear, a bracket system rated for the material is safest.

Crucial Mounting Steps That Get Skipped

Leveling before drilling is the most rushed step and determines whether the shelf looks right. IKEA requires leveling before marking for both LACK and KUNGSFORS—fixing a crooked shelf after anchors are in means new holes.

Pilot holes matter more with anchors than stud screws. A pilot hole sized to the anchor’s body prevents drywall cracking and lets the anchor seat fully. Also confirm what hardware came in the box: IKEA explicitly says wall plugs or screws may not be included, so a hardware store trip is sometimes part of the job.

Load capacity is product-specific and depends on design, material, and mounting—a shelf on two drywall anchors holds far less than the same shelf on brackets into studs. There’s no universal number. If no limit is stated, assume modest loads and distribute weight evenly.

For a shelf for your AV gear—often heavier than decorative items—a bracket system anchored into studs is safer. Our tested AV shelf wall mount roundup breaks down options that handle real weight without wobble.