Short answer
Drywall screws are designed to hold thin gypsum board to framing. Wood screws are designed to join pieces of wood and carry loads. They look similar, and drywall screws are cheap and handy for light indoor jobs, but they are made of harder, more brittle steel and are generally not recommended for anything structural or load-bearing.
Key differences
| Feature | Drywall screw | Wood screw |
|---|---|---|
| Thread | Threads along most or all of the shank | Often a smooth upper shank with threads below (some modern screws are fully threaded) |
| Head | Bugle head that sits flush without tearing paper | Flat, oval or round heads |
| Steel | Hardened, can be brittle | Usually softer and more ductile |
| Coating | Often black phosphate or a thin coating for indoor use | Zinc, exterior coatings or stainless steel are common |
| Point | Sharp, for quick starts | Gimlet, sharp or other styles |
| Intended use | Hanging drywall on wood or light-gauge metal studs | Woodworking, carpentry and joining wood |
Thread and shank details vary by brand, so read the package. Fine versus coarse drywall threads are explained in coarse vs fine drywall screws.
Strength and brittleness
Drywall screws are not necessarily weak in a straight pull. One woodworker’s informal test, using a bathroom scale and a lever setup, found that a #7 drywall screw’s head produced slightly more clamping force than a #8 wood screw, although the difference was small and the test was not a formal lab study.
The bigger concern is brittleness. In the same test, the drywall screws snapped before bending 90 degrees, while deck screws bent much more. Hardened steel resists bending but can break suddenly when pushed sideways (shear load). A screw that breaks without warning is the wrong choice for anything people stand on, lean on or hang weight from.
What happens if you use drywall screws on wood?
For light, non-structural indoor work, many people use them with no trouble, for example temporary jigs, shop projects or fastening thin trim where nothing is at risk. Problems can include:
- Snapped screws when overdriven or loaded sideways.
- Splitting if driven near edges without pilot holes.
- Rust and staining in damp or outdoor locations because of thin coatings.
- Poor clamping when threads run to the head, since the threads can grab both boards and keep them from pulling together.
Can you use a wood screw in drywall?
You can drive one into drywall, but it is not ideal. Wood screws have no bugle head, so they can tear the paper or sit proud. Neither screw holds well in drywall alone. For hanging items on a wall, use anchors rated for the weight, or locate a stud. Screws into a hollow wall cannot be trusted for heavy objects such as shelves with books, TVs, or cabinets. Find studs, use appropriate anchors, and follow the weight ratings on the hardware.
Where drywall screws are fine
- Fastening drywall to wood or light-gauge steel studs
- Light indoor assembly tasks where failure has no consequences
- Temporary fastening
Where to avoid them
Do not use drywall screws for:
- Decks, railings, stairs, ledger boards or any load-bearing connection
- Hanging cabinets, wall-mounted shelving, handrails or anything that supports weight or could cause injury if it falls
- Outdoor or damp-location projects, unless the screw is specifically rated for them
- Joist hangers and metal connectors, which require the specified fasteners
If you are unsure whether a connection is structural, treat it as structural. A building inspector, structural engineer or licensed contractor can tell you which fastener a connection requires. For decks and railings, local codes often specify fasteners.
Choosing the right screw
- Hanging drywall on wood: coarse-thread drywall screws.
- Hanging drywall on light-gauge steel: fine-thread drywall screws.
- General carpentry, furniture, cabinets: wood screws or structural screws designed for the job.
- Outdoor wood: exterior-rated, corrosion-resistant screws such as those labeled for decks or stainless steel.
- Sheathing and framing: nails or fasteners specified by the code, see nail spacing for wall sheathing.
When to call a professional
If the connection holds up a load, protects people from a fall, or is part of the building frame, have a qualified professional specify and inspect it.