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Start with the wall, not the anchor
The right anchor depends on what is behind the paint and how much force the fastener will see. A screw that holds a light picture in drywall may pull out under a towel bar’s repeated tugging. Masonry needs a drilled hole sized for the plug, while plaster can crack if you drill or tighten carelessly.
Check the wall before buying hardware. Look for studs with a stud finder, and confirm important locations with a small pilot hole if needed. For plaster walls, magnets can help locate nails in wood lath. In masonry, identify whether you are drilling brick, block, or concrete; hollow block behaves differently from solid concrete. Also check for wiring and plumbing before drilling.
Match the anchor to the load
Consider both weight and use. A clock is a mostly static load. A shelf puts leverage on its upper fasteners, and a grab bar or coat hook gets yanked repeatedly. Choose hardware rated for the wall material and application, and follow the package’s load limits. Published ratings vary with wall thickness, installation quality, spacing, and whether the load pulls straight out or down.
| Wall and anchor | Good fit | Main trade-off |
|---|---|---|
| Drywall: plastic expansion plug | Light items, usually a few pounds per fastener | Cheap and easy, but poor for repeated pulls or cantilevered loads |
| Drywall: self-drilling or threaded anchor | Light to moderate loads when no stud is available | Fast to install; can loosen or damage drywall if overtightened |
| Drywall: toggle or metal hollow-wall anchor | Heavier fixtures spread across sound drywall | Stronger hold, but needs a larger hole and clearance behind the wall |
| Plaster over lath: screw into stud or lath | Fixtures where a solid wood backing point is available | Reliable when located correctly; plaster can chip during drilling |
| Masonry: plastic plug or masonry screw | Light to moderate loads in brick or concrete | Requires a correctly sized masonry hole; plugs may not suit hollow block |
Drywall: choose between speed and holding power
For a small, lightly loaded item, a basic plastic expansion plug is often enough. Drill the specified hole, push the plug in flush, then drive the screw without spinning it. These are inexpensive, but the paper face and gypsum core are the limit; adding a bigger screw does not turn a weak location into a strong one.
Self-drilling anchors save time because many cut their own entry hole. They are convenient for mirrors, small shelves, and similar loads within the package rating. Drive them slowly and stop when the flange is snug. Overdriving can strip the gypsum, leaving an anchor that spins freely. For higher loads, use a toggle-style anchor or move the fastener into a stud. Toggles need a larger hole and unobstructed space behind the drywall; their metal wings cannot open if they land against a stud or pipe.
If you are fitting several anchors, a drywall anchor assortment is useful, but check each anchor’s stated material and load limits rather than relying on a large headline rating. For heavy cabinets, grab bars, or anything that could injure someone if it falls, fasten to framing or install proper backing instead of trusting an ordinary drywall anchor.
Plaster: avoid impact and oversized holes
Plaster is hard and brittle, often covering wood lath or masonry. A hammer drill’s impact action can crack or loosen the finish, especially near an edge. Start with a sharp bit and rotary-only drilling. Use a small pilot hole, keep the drill straight, and increase bit size only if the anchor requires it. If the plaster is thick or the backing is masonry, select a bit and anchor for that backing rather than treating it like drywall.
When you find a stud, use a screw long enough to pass through the plaster and engage solid wood, allowing for the fixture thickness. If anchoring into lath, be cautious: narrow wood strips can split and are not a dependable substitute for a stud under heavy or dynamic loads. A small pilot hole reduces splitting. For a fixture that will be pulled repeatedly, seek framing or add backing rather than counting on plaster alone.
Masonry: size the hole precisely
For brick, concrete, or solid block, use a masonry bit and an anchor made for that material. A hammer drill is useful in concrete, but rotary mode is often the safer starting point in brick, particularly near edges or on older, soft brick. Hammering can chip the face or split the masonry. Drill into the brick rather than the mortar joint when the fixture allows; mortar is usually weaker and can crumble.
Hole diameter matters. Follow the anchor instructions, drill to the stated depth, and clear dust from the hole before inserting the plug. A hole that is too wide gives the anchor little grip; one that is too shallow can prevent it seating flush. A plastic masonry plug is economical for light-to-moderate loads in solid material. A masonry screw avoids a separate plug but depends on a clean, accurately sized pilot hole. For heavier loads, choose a rated mechanical or chemical anchoring system suited to the substrate. Hollow block requires anchors designed to grip its cavities or webs, not just a standard plug intended for solid concrete.
A masonry drill bit set is handy if you do occasional concrete or brick work. Match the bit diameter to the anchor instructions, not simply to the screw’s outside diameter.
Install carefully and check the result
Use a drill or driver at low speed for the final tightening. An impact driver can drive screws quickly, but its repeated blows can strip plastic anchors, crush drywall, or crack brittle plaster. If you use one, keep the setting low and stop as soon as the fixture is secure. Do not keep turning a fastener that spins; remove it and repair or relocate the hole.
Before hanging the full load, pull gently on the fixture and look for movement, cracking, or a widening hole. Keep anchor spacing and edge distances as specified by the manufacturer. When the consequences of failure are serious, the practical choice is usually a stud, masonry fastener rated for the substrate, or professional installation—not a stronger-sounding package claim.