Wood Screw Head Types: Phillips, Torx, Square & More Explained

Three inches into a five-inch deck screw, and the Phillips bit just popped out of the head. Now the screw won't go in or come out. The confusion that lands builders in that mess comes from one thing: wood screw head types and drive types are two separate decisions, and most online guides mash them together.

We've spent 28 years building decks, fences, docks, and other outdoor wooden structures, working with every head shape and drive on the market. Here's what the heads are, what the drives are, pro tips on picking the right combo, and which one to grab for the job in front of you.

Which Wood Screw Head and Drive Is Best for Your Project?

For outdoor wood applications, our pick is Eagle Claw stainless steel wood screws. We carry both the 304 grade stainless steel deck screws for general pressure-treated, cedar, redwood, and inland hardwood applications, and the 316 marine grade collection for any deck within three miles of saltwater. Both lines are flat head with under-head nibs, T25 Torx drive, with Type 17 self-starting tips.

For pressure-treated decking specifically, ACQ copper preservatives chew through galvanized and zinc coatings within a few seasons. We laid out the corrosion math in coated vs stainless steel deck screws, and the case for stainless on pressure-treated boards in stainless steel screws for pressure-treated decking. For cedar specifically, stainless steel wood screws for cedar fencing covers why galvanized leaves black tannin streaks down every picket.

For deck screw selection more broadly, our 6 types of deck screws walks through the head shape and material trade-offs for the most common deck applications, and how to prevent rust on screws outdoors covers what corrosion actually looks like in the field.

Wood Screw Heads vs Drives: Two Decisions, Not One

Most online confusion about wood screw heads comes from mixing up two specs that are independent. The head is the shape of the top of the screw, the part you see sitting in (or above) the wood. The drive is the shape of the recess the bit fits into. Same wood screw, different combinations.

Look at any product spec sheet and you'll see both listed. A Simpson DSV multi-purpose deck screw is flat head with nibs plus T25 Torx drive. An Eagle Claw 304 stainless deck screw is also flat head with nibs plus T25 Torx drive. A Kreg pocket-hole screw is pan head plus number 2 square drive. A typical drywall screw is bugle head plus number 2 Phillips drive.

Same head can come with different drives. Same drive can come on different heads. When someone says they want a "Phillips head screw," they usually mean a Phillips drive screw, since the head shape (flat, pan, bugle, whatever) is a separate question.

Things to Keep in Mind: If a product description just says "Phillips head" without naming the head shape, check the spec sheet. "Phillips" is a drive, not a head. The head could be flat, bugle, pan, or something else, and that matters more for the application than the drive does.

How Many Wood Screw Head Types Are There?

There are 8 wood screw head shapes you'll actually see on hardware-store shelves and 6 drive types still made on modern wood screws.

The 8 head shapes: flat (countersunk), pan, bugle, truss, wafer, hex washer, round, and oval. Some lists count round and button as the same shape; some split internal hex from external hex. Eight covers every common wood-construction head shape stocked in North America.

The 6 drives: Torx (six-pointed star), square (Robertson), Phillips, Pozidriv, hex (internal Allen or external hex), and slotted. Slotted is mostly limited to antique restoration now, but it's still made.

Below, each head shape and each drive type gets its own breakdown: what it looks like, when to pick it, and which brands actually make wood screws with that spec.

The 8 Wood Screw Head Shapes Explained

1. Flat head: the cabinet, trim, and outdoor-decking standard

Sits flush in a countersunk hole (82 degrees in the US, 90 metric). Most modern flat-head wood screws have small ridges underneath the head that cut their own little nest as the screw goes in, so the head sits flush in softwood without a separate countersink step

Simpson's Deck-Drive DSV calls this a rimmed flat head with nibs, and it's the dominant head shape across modern outdoor wood screw lines.

In 28 years of building decks, fences, and other outdoor wooden structures, the screws we reach for first have those tiny ridges. In hardwood like ipe or cumaru, even those won't save you from pre-drilling, and we still do.

Pick flat head screws if:

• you're working on cabinets, trim, or finish carpentry
• you're driving stainless screws into outdoor decking
• you want a fully flush surface ready for paint or stain

Brands: Eagle Claw 304, 305, and 316 stainless (flat with nibs across the line); Simpson DSV and DHPD; Starborn Headcote stainless; SPAX T-Star Plus.

2. Pan head: hinges, drawer slides, and visible hardware

Sits proud of the surface with a flat underside and rounded sides. The flat underside stops the screw from pulling through soft wood when something heavy hangs off it, which is why pan head shows up on hinges, drawer slides, and any hardware where the head is meant to be seen.

Pick pan head screws if:

• you're mounting metal hardware, hinges, or drawer slides
• you want cabinet hardware where the head stays visible
• you're driving pocket-hole screws (the pan head can't pull through the angled hole)

Brands: GRK Cabinet Screw (T15 Torx); Kreg pocket-hole screws (number 2 square); McFeely's pan-head production screws.

3. Bugle head: the deck screw and drywall standard

Concave underside that flares out from the shaft. As it seats, the curve crushes the wood fibers down and pulls itself flush, so it sinks its own hole in softwood without pre-drilling. Because that curve presses down over a wider area than a flat head, it drives faster and seats cleaner in soft material without splitting it. Almost every drywall screw uses this shape, and a lot of deck screws do too.

Pick bugle head screws if:

• you're working on pressure-treated softwood decking
• you're hanging drywall
• you want clean self-countersinking without a separate countersink step
• you're not attaching a ledger (use hex washer for that)

Brands: GRK R4 multi-purpose; FastenMaster TrapEase III; Hillman Power Pro Premium exterior; Grip-Rite Star Drive Exterior. Most bulk "deck screws" at big-box stores are bugle.

4. Truss head: fence pickets and sheet metal

Wide, low, mushroom-shaped head that protrudes above the surface. Spreads weight across a wide footprint with a low profile, so it holds picket boards or sheet metal without sinking through. Pick it for fence pickets, sheet metal, lath, or any spot where a pan head won't fit. Brands: Cat's Claw fence fastening system; Simpson DSV variants; FastenMaster truss-style options.

5. Wafer head: drawer slides, lath, and self-drilling

Extra-wide, low-profile head that acts like a built-in washer, so you don't add a separate one. Pick it for drawer slides, metal lath, and low-clearance soft-material applications. Brands: GRK wafer-head cabinet variants; Simpson Quik Drive collated wafer heads; FastenMaster structural washer-head variants.

6. Hex washer head: structural and ledger work

Hex outer profile (turned with a wrench or socket) plus a built-in washer face. Holds the most torque of any head shape because there's no recess to strip; the wrench grips the outside of the head, so all the force goes straight into turning the screw.

In 28 years of deck and dock work, we've seen plenty of jobs where someone hung a ledger with a regular deck screw because that's what was on the truck, then the inspector showed up and it all came out. A deck screw's curved underside sinks too far into the ledger and leaves nothing to hold the load. A hex washer head sits on top of the wood with a built-in flat washer, which is what the connection needs.

Pick hex washer head screws if:

• you're attaching a deck ledger or making post-to-beam connections
• you're installing connector screws on joist hangers
• you're replacing a lag bolt with a structural screw

Brands: Simpson SDS Heavy-Duty Connector (3/8" hex); Simpson SDWH Timber-Hex SS; Simpson SD9/SD10 connectors; FastenMaster TimberLok and LedgerLok.

7. Round head: antique restoration territory

Domed, fully exposed head with no countersink. The all-purpose head shape from the 19th century, replaced by flat and bugle for modern construction. Pick it for antique furniture restoration, period-correct hinges, and decorative brass hardware. No major production wood-screw brand defaults to round head anymore; source from specialty restoration suppliers.

8. Oval head: door hinges and decorative finish

Partial countersink with a rounded, raised top. The countersunk underside seats flush; the oval top adds a finished look above the surface. Pick it for cabinet and door hinges or decorative finish work where a raised top looks better than fully flush. Rare on dedicated wood-screw lines; mostly Hillman specialty hardware and brass restoration suppliers.

The 6 Wood Screw Drive Types Explained

1. Torx (star drive): the modern standard for outdoor wood

Six-pointed star recess with straight sidewalls. The straight sides mean the bit doesn't get shoved back out of the screw while you're driving it, so almost none of your effort is wasted.

On the same screw, a Phillips bit will slip and chew out the head four to six times sooner than a Torx bit will under the same pressure. That's why a stripped Torx is rare and a stripped Phillips is an everyday thing.

After 28 years of driving wood screws every way you can, from old corded drills to modern impacts, a single Torx bit will usually run through whole boxes of stainless deck screws on one project before showing wear. Going back to Phillips after that feels like driving with the parking brake on.

Pick Torx drive screws if:

• you're working on any outdoor wood project
• you're driving with an impact driver
• you're doing structural framing
• you're choosing between two products and one is Torx (just take the Torx)

Brands: Eagle Claw entire stainless line (T25 across 304, 305, 316); Simpson DSV, DHPD, DWP, SDWS; Starborn Headcote and Cap-Tor xd; GRK R4 and RSS; FastenMaster TimberLok and FlatLok; Hillman Power Pro Premium; SPAX T-Star Plus.

Which T-size you actually need: T15 for cabinet trim and number 6 screws; T20 for number 8; T25 for number 10 (by far the most common on site, Eagle Claw's default); T30 for number 12; T40 and up for lag-style structural. If you stock one size, stock T25. Don't trust the bit in the screw box; those round out within the first hundred drives.

2. Square (Robertson) drive: the cabinet pro favorite

Square recess, deepest grip of any common drive. A true Robertson recess is slightly tapered, so the bit grips the screw tight enough that you can hold the driver sideways with the screw hanging off the tip.

Inside a finished cabinet box, holding a slide with one hand while you drive with the other, the screw stays on the bit while you guide it home. Cabinet pros often run a single number 2 square bit for the majority of their fasteners.

Pick square (Robertson) drive screws if:

• you're doing cabinet work or pocket-hole joinery
• you're installing drawer slides
• you're driving hardwood deck face screws like Simpson DHPD
• you need precision and one-handed driving

Brands: Kreg pocket-hole screws (square only); Simpson DHPD hardwood deck screw; McFeely's signature line; GRK R4 (Phillips/square combo on some sizes).

3. Phillips drive: being phased out for serious wood work

Cross-shaped recess with sloping walls. Phillips made it slip on purpose, so 1940s assembly-line workers didn't crack screw heads off back when their tools couldn't tell how hard they were driving. That made sense on a 1940s line.

On a modern impact driver it's a problem, because roughly a third or more of your effort gets wasted shoving the bit back out instead of turning the screw.

We know plenty of builders who have a Phillips strip three inches into a five-inch drive, leaving a screw that won't go in or come out. There's a safety angle too; when a Phillips bit cams out under torque the driver lurches forward, which is how a lot of pros end up with stabbed hands before they switch drives.

Pick Phillips drive screws if:

• you're hanging drywall (the cam-out stops the screw before it tears the paper face)
• you're driving light interior cabinet hardware or short utility screws
• you're on a budget project where stripping doesn't matter

Brands: Hillman standard wood screws; Grip-Rite construction screws; Everbilt Phillips bugle and flat head; most big-box house brands; most drywall screws (Phillips bugle).

Things to Keep in Mind: Phillips wood screws are still the cheapest at the box store. You save a few dollars per box but lose a stripped screw on every fifth drive in pressure-treated lumber. On a long deck that's a real day-end difference, and the screws you can't remove become a problem you live with.

4. Pozidriv: looks like Phillips, isn't Phillips

Looks almost identical to Phillips but has four small ribs between the cross arms. It grips better than Phillips and slips less, though it's still nowhere near Torx. The trap: a Phillips bit fits a Pozidriv screw and turns it, but slips out under real load, often before the screw is seated.

That's why cup hinges on European-import cabinets seem to loosen so fast. Pick it for European-import screws, IKEA assembly, and anything from a German source. Brands: SPAX T-Star Plus; Reisser; Würth and fischer import lines.

5. Hex (Allen) drive: structural and lag territory

Two related drives: external hex (a hexagon on the outside, turned with a wrench or socket) and internal hex or Allen (a recess turned with an Allen key). External hex is far more common on modern wood screws.

There's no recess to chew out, just six flat sides for the wrench to grab, which is why the connector screws the code actually lists are all some form of hex. The trade-off: it means a tool change if the rest of your screws are Torx.

Pick hex drive screws if:

• you're attaching a ledger board or making post-to-beam connections
• you're installing connector screws on joist hangers
• you're doing heavy structural fastening that replaces a lag bolt

Brands: Simpson SDS, SDWH, SD9/SD10 connectors; FastenMaster TimberLOK and LedgerLok; SPAX PowerLags; Cat's Claw fence fastening system.

6. Slotted drive: antique-only territory

Single straight line across the head, the original drive from the 1500s. Cams out at the slightest torque, has no self-centering, and needs constant downward pressure to stay seated. It survives purely for looks: period-accurate antique furniture and reproduction brass hardware look wrong with anything else. Pick it only for antique restoration, period-correct hinges, decorative brass furniture screws, and electrical cover plates. No major production wood-screw brand defaults to slotted; source from specialty restoration suppliers.

What Are the Strongest Wood Screw Head Types?

After 28 years of building decks, fences, and docks, here's what actually decides whether a screw holds up under load. Head shape barely matters. Three other things matter more, and the USDA Forest Products Lab Wood Handbook, Chapter 8 (Fastenings) backs up all three.

• Material grade. A 304 stainless screw is strong steel that takes a serious pull before it snaps. 316 marine grade adds molybdenum that keeps it from pitting in salt air.

Heat-treated structural screws (Simpson SDWS Timber, GRK RSS, FastenMaster LedgerLok) are harder still, but that hardness costs them flex: they snap instead of bending when a joint gets pushed past its limit, which is why drywall screws are banned from framing. See advantages of stainless steel wood screws for why grade beats head shape outdoors.

• Drive recess depth. A deeper drive (Torx, Robertson) lets you drive the screw as hard as it's built to take without chewing out the head. A shallow drive (Phillips) strips before the screw is fully seated, so you never get to use half the strength you paid for.
• Head shape, only at the extreme. For big structural fasteners the hex washer head wins, because the wrench grips the outside and there's no recess to strip. That's why every code-listed connector screw uses a hex or hex-washer head. On standard wood screws, head shape changes how the screw seats, not how strong the steel is.

The honest rule: pick a head for the application, a drive for the tool, and a material grade for the environment. None is "strongest" on its own. Size matters too; our complete wood screw size chart covers gauge and length by application.

Things to Keep in Mind: On metal connectors (joist hangers, post bases, hurricane straps), you use the screw the manufacturer says to use, full stop. Per Simpson's connector fastener selection guide, only Simpson SD, SD9, SD10, and SDS screws are listed for Simpson connectors, and you can't mix them with nails in the same hanger.

A beefier generic screw doesn't count, because the rating only holds for that exact screw in that exact connector, tested together.

How Do You Choose the Right Wood Screw Head and Drive?

Two decisions, not one. Pick the head shape that fits the application: flat with nibs for general outdoor work, bugle for softwood decking, hex washer for ledgers and connectors, trim for finish work, pan for cabinet hardware.

Pick the drive that fits the tool: Torx T25 for almost everything outdoor, square for cabinets and pocket holes, external hex for structural. Pick the material grade for the environment: 304 stainless inland, 316 within three miles of saltwater. Match the brand to the spec, not the other way around.