How to Drill Through Metal Studs Behind Drywall UK

Why metal studs behave differently to timber

Timber studs give you something solid to bite into. A wood screw pulls tight because the fibres grip the thread. Metal studs are thin steel folded into a C-shape. The faces are hard and springy, the edges are sharp when cut, and the cavity behind is hollow. Drilling is therefore less about power and more about control.

Three things catch UK DIYers out. First, speed: most people drill metal too fast, which overheats the tip and dulls it in seconds. Second, pressure: leaning hard on the drill flexes the stud face, so the bit breaks through suddenly and grabs. Third, fixings: standard brown wall plugs rely on masonry to wedge against. In a hollow metal stud wall they spin and pull out. Once you switch those three assumptions, metal studs are easier than brick. Our essential home DIY tools guide covers the core kit that makes this kind of job routine.

The tools you actually need

You do not need an SDS hammer or a workshop full of gear. A standard 18V combi drill on drill (non-hammer) mode plus the correct bits covers every metal stud job in a UK home.

1. A variable-speed combi drill

Any decent 18V combi drill will do, because you will run it slow. The DeWalt DCD778S2T and Bosch GSB 18V-55 both have a low-speed clutch range that is ideal for metal, while the Einhell TE-CD 18/40 proves a budget option still gives enough control. Keep hammer action off. Hammer plus metal just work-hardens the steel and kills the tip.

2. Sharp HSS twist bits, ideally titanium-coated or cobalt

Standard HSS is fine for one or two holes in light-gauge steel, but a coated set stays sharp longer and clears swarf better. The Bosch 25-piece HSS-R set is the drawer staple for metal, plastic and wood, the 99-piece titanium-coated twist bit set covers every odd size you will need for toggles and grommets, and the Bosch MS4041 mixed set adds driver bits and masonry bits so one box handles the whole wall. For thicker studs or stainless noggins, cobalt bits are worth the extra cost, but for the 0.5mm to 0.9mm steel found in UK partition walls, quality HSS is enough. See best drill bit sets UK for a full comparison.

3. An automatic centre punch

Thin steel is slippery. Without a starter dimple the bit walks the moment it touches. The Eclipse automatic centre punch taps a precise indent one-handed, even when you are up a ladder holding plasterboard steady with the other hand. It is the single cheapest upgrade that prevents skating and off-centre holes.

4. Extras that save time

• A stud finder with AC warning to locate the steel and flag live cables
• Masking tape to stop the plasterboard face tearing as the bit enters
• A small bottle of cutting oil or even 3-in-1 oil to keep the tip cool on larger holes
• A JSP FFP3 dust mask when you are drilling above head height and plaster dust is falling
• Deburring tool or a larger drill bit twisted by hand to break the sharp burr left on the back of the steel

Find the stud and check what is behind it

UK partition walls are typically plasterboard on 50mm to 70mm metal C-studs at 400mm or 600mm centres, with insulation or services in the cavity. Before you drill, map the layout properly.

1. Locate the stud. Use a magnetic or electronic stud finder. Magnets snap to the steel; electronic finders beep over the centre. Mark both edges with pencil so you know the true centre line.
2. Scan for electrics. Cables often run vertically or horizontally through pre-punched holes in the studs. Run the detector in AC mode and avoid drilling within 50mm of a detected cable. If in doubt, turn the circuit off at the consumer unit while you work.
3. Check for pipes. In kitchens and bathrooms, copper or plastic pipework may be clipped to the stud face. A pipe detector or a careful look in the loft or under the floor below helps confirm the route.
4. Mark and tape. Put a cross on the plasterboard where the hole needs to be, then lay a strip of masking tape over it. The tape prevents the paper face from tearing as the bit enters and gives you a surface to re-mark clearly.
5. Confirm with a pilot. For fixings that must be exact, drill a 2mm pilot through the plasterboard first. You will feel the bit touch steel. If the pilot misses the centre, you have only a pinhole to fill.

If you are also fixing into masonry elsewhere in the same room, the approach is quite different. Our guide to drilling into brick explains hammer action and masonry bits, while how to hang shelves on plasterboard covers anchors that work when there is no stud to hit.

Step by step: drilling through the metal stud

Set your drill to drill mode, not hammer, and select low speed. Insert a sharp HSS bit slightly smaller than your final hole size if you are stepping up, or the exact size if it is under 6mm.

1. Punch the steel. Press the Eclipse centre punch squarely on your mark and click it. You want a visible dimple, not a dent that deforms the stud.
2. Start slow and square. Place the tip in the dimple, hold the drill perpendicular to the wall, and start at the lowest speed with light, steady pressure. You should see a fine, continuous spiral of swarf, not dust or smoke.
3. Use a drop of oil on larger holes. For holes above 6mm, a single drop of cutting oil on the tip reduces heat and extends bit life. Wipe the excess afterwards so fixings do not slip.
4. Ease off as you break through. Light-gauge steel gives way suddenly. Reduce pressure in the last millimetre so the bit does not grab and wrench the drill. Let the flutes clear the disc of steel rather than forcing it.
5. Deburr the hole. The back of the hole will have a sharp, razor-like burr. Twist a larger bit or a deburring tool by hand once around the hole to remove it. This protects cables and stops fixings from catching.
6. Vacuum the cavity. Steel filings and plaster dust fall inside the wall. A quick vacuum through the hole prevents rattles and keeps magnetic fixings clean.

For holes larger than 10mm, step up in stages, for example 4mm then 8mm then final size, rather than going straight to full diameter. Stepped drilling keeps the bit centred, reduces heat, and leaves a rounder hole. A step drill bit is ideal for this in thin steel and gives a clean, burr-free edge in one pass if you have one in the kit.

Fixings that actually hold in metal stud walls

Drilling the hole is half the job. The fixing you choose decides whether a shelf stays up. Standard plastic wall plugs rely on expanding against solid masonry, so they are useless in a hollow stud.

• Self-drilling drywall anchors for light loads. Metal or heavy-duty nylon anchors that cut their own thread into the plasterboard. Good for mirrors, small shelves and curtain tracks where you miss the stud.
• Toggles and spring toggles for medium to heavy loads. Drill through the steel, push the folded toggle through, and it springs open behind the stud. Rated loads are printed on the box and are the honest numbers to trust.
• Fine-thread drywall screws into the stud itself. For battens and brackets where the screw threads into the steel flange. Pre-drill the steel with a 2.5mm to 3mm HSS bit, then drive a fine-thread screw, not a coarse timber screw which strips thin steel.
• Rubber grommets for cables. If you are running a cable through the stud, push a rubber grommet into the hole first. The raw steel edge will slice cable insulation over time without one.

A useful rule in UK rentals and new-builds: if you can hit the stud, do. A screw into steel plus a toggle either side of it will hold far more than four plastic plugs in plasterboard alone. Our shelving guide shows weight ratings and layout patterns for common shelf sizes.

When it goes wrong: what the symptoms mean

• The bit skates and scratches the wall. No centre punch or the punch was off-centre. Re-mark, punch properly, and start at the lowest speed with the bit already seated in the dimple.
• Smoke or blue swarf. Speed too high or the bit is blunt. Back off the speed, add a drop of oil, and swap to a sharp bit. Blue swarf means the tip has overheated and will not cut well again.
• The drill grabs as it breaks through. Too much pressure in the final millimetre. Ease off, let the bit cut under its own weight, and keep your wrist firm but not locked.
• A large burr catches screws or cables. You skipped deburring. Twist a countersink or larger bit by hand once around each side of the hole.
• Screws strip and spin. Wrong thread for steel or the pilot was too large. Use fine-thread drywall screws into metal and keep the pilot 0.5mm smaller than the screw core.
• Plasterboard crumbles around the hole. The board flexed because the stud is not tight to the board. Back the board with a timber offcut while drilling, or drill a smaller pilot and step up.

Products mentioned in this guide

• Bosch 25 Piece Metal HSS-R Drill Bit Set - the core metal-drilling set for thin steel and general DIY
• 99 Pcs Titanium Coated Twist Drill Bit Set - covers every odd size for toggles and grommets
• Bosch MS4041 41-Piece Drilling and Driving Mixed Set - one box for metal, masonry and driving
• Eclipse Professional Tools Automatic Centre Punch - stops skating on steel and plaster
• STANLEY Set of 100 Hex Drill Bits and Accessories - budget-friendly backup set for home workshops
• JSP M632 FFP3 Valved Dust Mask - keeps fine plaster and steel dust out of your lungs

Also read: Drill Bit Types Explained, Best Drill Bit Sets UK and Essential Home DIY Tools for Beginners

Frequently Asked Questions

The Bottom Line

Drilling through metal studs behind drywall is a control job, not a power job. Punch a dimple with the Eclipse centre punch, cut with a sharp HSS bit like the Bosch HSS-R set on low speed with no hammer, ease off as you break through, and deburr the edge. Pair the hole with a fixing designed for hollow walls and the result is clean, strong and rattle-free. Get those three details right and metal studs are quicker than masonry, with less dust and no hammer drill needed.