The Right Wood Screws to Use, by Project, Wood & Weather

How do you know which wood screws to use? It's the question that separates a deck that lasts 25 years from one you're tearing apart in three. Pick wrong and heads pop off two summers later, or you snap a #10 stainless steel screw off in ipe before the second deck board.

The answer comes down to three things: what you're building, what wood you're driving into, and what the weather will throw at it. This guide walks through every decision, built on 28 years of timber construction at a specialist fastener retailer carrying Eagle Claw Fasteners, Simpson Strong-Tie, Starborn Industries, and Cat's Claw.

Quick Pick: Which Wood Screw for Your Project

This is the table to bookmark. Find your project, read the row, buy the screw.

For the full size and gauge breakdown including pilot hole sizes, see our complete wood screw size chart.

What Are the Different Types of Wood Screws and What Type Is Best for Your Project?

Wood screws aren't one product. There are seven kinds you'll see at the store, and each one solves a different job.

1. Multi-Purpose Wood Screws

Best for: General assembly, indoor framing, basement walls, garage shelving, jigs, form work, and outdoor projects where no code rating is required.

• Coarse threads, sharp tip, bugle head, T20 or T25 drive
• Drive without splitting in most softwoods, countersink flush
• Premium pick: GRK R4 (working contractors describe them as "Cadillac screws")
• Everyday alternative: SPAX with serrated threads that auger out wood chips
• For high-volume builds, SPAX in bulk wins on cost-per-screw

2. Deck Screws

Best for: Face-screwing 5/4 and 2x deck boards, railings, stair treads, fence pickets, garden beds, outdoor furniture, and any outdoor wood-to-wood connection.

• Coarse threads, Type 17 auger point (no pre-drill), bugle or trim head
• Corrosion-resistant material is mandatory: 304/305/316 SS, hot-dip galvanized, or premium-coated
• Cheap "deck screws" with thin zinc plating do not belong on a real deck
• Pro standard: #10 x 2-1/2" stainless steel screws for 5/4 PT, #10 x 3" for 2x decking
• For composite decking (Trex, TimberTech, Fiberon, Azek): use composite-specific screws like Starborn Cap-Tor xd. Reverse threads under the head pull the composite shell down flush instead of mushrooming it up, T20 deep recess minimizes wobble at the start, and the 15-color palette matches the major board brands. Comparable: Simpson DCU
• For deck-specific recommendations including pricing comparisons across Eagle Claw, Simpson, Starborn, and competitor brands, see our best deck screws guide

Best for Outdoor Decks

Eagle Claw #10 x 2-1/2" 304 Stainless Steel Deck Screws

We drive these on every 5/4 and 2x deck where the customer doesn't want to think about rust again. The 304 stainless won't bleed a black streak down cedar or pop its head off a PT board two summers later, and the T25 Torx recess takes the torque without camming out. We put them in a coastal cedar deck six years back and still haven't seen a spot of corrosion.

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3. Construction Screws

Best for: 2x4 wall framing, blocking, rim joists, sill plate fastening, subfloor, and anywhere you'd otherwise drive 16d nails.

• Bigger gauge (#9, #10, #12), longer lengths (3" to 6")
• Almost always Torx drive
• Common picks: Simpson DSV, GRK RSS
• For 2-1/2" or 3" general construction, working contractors prefer the #10 over the #9 because they bite better

4. Structural Wood Screws

Best for: Deck ledgers, post-to-beam, beam-to-post, joist hangers (use connector-rated variants), pergola post connections, retaining walls, and any code-inspected load-bearing joint.

• Carry ICC-ES evaluation reports (ESR-2236, ESR-2442, ESR-1078)
• Thicker shanks (0.220" to 0.300"), longer lengths (3" to 12"+)
• Either premium coatings or full SS through and through
• Examples: Simpson SDWS Timber, GRK RSS, FastenMaster TimberLok and HeadLok
• Use them anywhere the inspector's going to check, or where shear and pull-out ratings matter

Best Structural Wood Screw

Simpson Strong-Tie SDWS Timber SS Heavy-Duty Screw

We reach for these any time a joint has to carry load and an inspector's going to look at it, like a deck ledger bolted to the band rim. A 5/16" SDWS Timber matches a 1/2" lag in shear and drives in clean with no pre-drill, so a ledger that used to eat two days wraps up in an afternoon. Most inspectors already know the Simpson stamp, which means no red tag and no re-inspection.

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5. Cabinet Screws

Best for: Cabinet box assembly, mounting cabinets to wall studs, drawer slide hardware, and any install where MDF or particle-board crushing is a risk.

• Washer-style heads spread clamping force across cabinet material
• Larger bearing surface stops MDF or particle-board crushing you get with a regular bugle head
• For face-frame work, #8 x 2-1/2" trim-head screws are a popular alternative

6. Trim Screws

Best for: Finish carpentry, baseboard, crown molding, door casing, hidden hinge fastening, and any spot where a flush, invisible head matters.

• Look like a finish nail with threads
• Countersink cleanly into hardwood
• Common in #6 and #7 gauge
• Long-time homebuilders consistently recommend 1-3/4" stainless steel trim screws for finish carpentry

7. Self-Drilling Wood Screws

Best for: Wood-to-metal connections like sheet metal flashing, light-gauge steel framing, and roofing applications where a separate pilot bit isn't practical. Not rated for hardwood, in ipe and other dense species the drill tip stalls and the screw snaps.

• Self-drilling wood-to-metal screws combine a cutting tip with self-tapping threads
• Handle wood-to-steel transitions in a single pass
• Different from a Type 17 auger point, which is sharp but not a true drill bit

What NOT to Use

A few common mistakes worth calling out.

• Drywall screws: Brittle, snap under load, never structural
• Particleboard screws: Made for soft, crumbly material, won't bite into solid wood
• Confirmat screws: For melamine and particle-board cabinet carcass, not lumber
• Generic "all-purpose" screws: If the box has no specification beyond "all-purpose," check it twice

What Are Wood Screws Made Of and What Material Is Best for Your Location?

Material is where most beginners go wrong. Picking the wrong material is the worst mistake we see, and it's usually the one nobody talks about until the deck is rusting in year three.

1. Carbon Steel (Plain)

Best for: Indoor dry conditions only. Anywhere you don't see weather, water, or treated wood.

• Untreated, no coating
• Indoor only
• Cheap, strong, will rust the second you take it outside

2. Zinc-Plated

Best for: Indoor cabinetry, jigs, shop projects, and other dry-environment work. Never outdoor, never PT lumber.

• Thin layer of electroplated zinc, about 5 to 8 microns thick
• Fine for indoor cabinetry, jigs, shop projects
• Not approved for pressure treated lumber under IRC R317.3.1
• Not acceptable for any outdoor work in wet climates
• The plating is too thin, and once nicked the steel beneath rusts within months

3. Hot-Dip Galvanized (HDG, ASTM A153)

Best for: Pressure treated lumber when the budget can't stretch to stainless steel screws, sheltered outdoor framing, fence posts in dry climates, and inland decks away from saltwater.

• Thicker zinc coating, around 50 microns, formed by dipping the screw in molten zinc
• Bonded to the steel rather than just plated on
• One of only two fastener systems the American Galvanizers Association recommends for ACQ and copper-azole pressure treated lumber. The other is stainless steel screws.
• Holds up in PT for years, not forever, since the zinc keeps wearing away to protect the steel underneath
• Don't mix HDG screws with stainless steel joist hangers in wet conditions, the galvanic reaction kills the zinc fast

4. Ceramic-Coated and Polymer-Coated

Best for: Budget ACQ deck builds, mid-range outdoor projects, and any spot where stainless steel screws are overkill but plain steel would fail.

• Multi-layer coatings (zinc plus polymer plus ceramic) built for treated lumber
• Examples: Simpson DSV, Simpson SDS, GRK Climatek, FastenMaster Cortex
• Most carry ICC-ES approval for ACQ and CA-treated wood (ESR-2236, ESR-2442, ESR-1078)
• Best budget pick for ACQ work: Simpson DSV (Double Barrier coating, ICC-ES tested under ESR-2236), the everyday go-to coated screw when the budget can't stretch to all stainless steel screws. Comparable: GRK Climatek (premium coated), FastenMaster TrapEase III (composite-specific coated)
• The shear-plane problem: All coated steel screws share one weakness. Once the coating is nicked, scratched, or driven through a hard layer like a knot, the bare steel underneath gets exposed and starts corroding. The USDA Forest Products Lab Wood Handbook (Ch. 8) documents this failure mode.
• Contractors who lived through the original ACQ rollout report that early ACQ-rated coated screws still corroded within a few years. Many switched to stainless steel screws for all PT work and never looked back.

5. 304 Stainless Steel Screws

Best for: General outdoor work, decks, fences, pergolas, garden beds, and anywhere inland away from saltwater.

• The 18-8 alloy: 18% chromium, 8% nickel, no molybdenum
• Won't rust in pressure treated lumber, won't stain cedar, won't corrode in normal outdoor weather
• Roughly 50+ years of service inland, away from saltwater
• The default outdoor screw for pros who don't want callbacks
• Eagle Claw's 304 SS deck and wood screws are the standard pick for general outdoor work, available in #8 x 1-5/8" through #12 x 4" with T25 Torx drive
• Pricing runs from about $18.70 (100-pack of #8 x 1-5/8") to $35.20 (100-pack of #10 x 3"); the Eagle Claw value pack is the bulk option for #10 x 2-1/2"

One coastal deck builder reported six years of corrosion-free performance after switching from coated screws to Eagle Claw 304 SS, even though they live near the ocean and the deck is cedar. That's what stainless steel screws are supposed to do.

One thing most guides don't tell you: stainless steel screws are softer than carbon steel and can snap in hardwood if you don't pre-drill. Experienced deck builders consistently report this. Pre-drill aggressively in hardwood, or pick brands built to handle it, like Eagle Claw's Torx-drive 304 SS line. The Torx recess transfers more torque before the head gives up.

6. 305 Stainless Steel Screws

Best for: The same outdoor applications as 304. Mostly seen in specialty deck and trim screws like Starborn Headcote.

• Close cousin to 304 with slightly higher nickel content
• Used in specialty deck screws like Starborn Headcote
• Marginal corrosion-resistance bump over 304
• Functionally interchangeable with 304 for most outdoor work

7. 316 Marine-Grade Stainless Steel Screws

Best for: Docks, jetties, pool decks, hot tub surrounds, steam saunas (dry saunas can use 304), coastal cedar decks, and any project within 3 miles of saltwater.

• The big one for coastal work
• Adds molybdenum (around 2 to 3%), the bit that helps the protective layer heal itself when the surface gets scratched, even in salt
• The American Wood Council and Simpson Strong-Tie both reference 316 as the standard within 3 miles of a shoreline
• Coastal timber specialists who've removed thousands of rusted screws are unanimous: 304 isn't enough near saltwater, 316 is
• Eagle Claw's 316 marine deck screws are the right pick for docks, jetties, pool decks, and any coastal cedar deck; the #10 x 2-1/2" 316 starts at $37.90 per 100-pack
• For direct saltwater splash zones (docks, jetties, pool decks), step up from 304 to 316 marine for the long-term insurance

8. Brass

Best for: Furniture and decorative use only. Never structural, never outdoor near water.

• Decorative or restoration use only
• Soft, and brass plus saltwater means dezincification (the zinc leaches out and the screw crumbles)
• Don't use it outdoors or anywhere it has to hold weight

Lifespan by Material (Approximate)

What Is the Strongest Type of Wood Screw and Which Is Best for a Sturdy Structure?

If you've never built a deck before, you might assume ledger boards still need 1/2 inch lag bolts. They don't. In the last decade, structural wood screws like Simpson SDWS Timber and GRK RSS have functionally replaced lag bolts for ledger work. They're easier to drive, no pre-drill required, and code-rated for the job.

The numbers back this up. A 5/16-inch GRK RSS structural screw matches the strength of a 1/2-inch lag bolt in shear. One Portland deck contractor documented replacing 40 corroded 1/2" lag bolts on a 3-year-old ledger with 5/16" structural screws and finished in an afternoon instead of two days, saving roughly $920 in labor.

Here's what the pros use for each kind of sturdy structure.

1. Best for Deck Ledgers and Post-to-Beam: Simpson SDWS Timber

The structural screw most inspectors expect to see.

• The one inspectors want to see for deck ledgers, beam-to-post, and post-to-beam
• Code-rated for PT lumber under ICC-ES ESR-2236
• Diameters from 0.220" to 0.300", lengths from 3" to 12"+
• Clean Torx drive (T40 typical), no pre-drill in framing lumber
• For coastal: Simpson SDWS Timber SS in 316 marine grade
• Premium alternative: GRK RSS (ICC-ES ESR-2442, Climatek-coated, fluted tip and notched threads). A 5/16" RSS replaces a 1/2" lag in shear strength, code-for-code

Things to Keep in Mind: Not every structural screw passes inspection in every county. Simpson Strong-Tie carries more ICC-ES code approvals than any other brand, and a lot of inspectors only sign off on Simpson SDS or SDWS. If your job's getting inspected, ask the inspector what they accept before you buy. Swapping another brand for a Simpson can get the deck red-tagged and force a re-inspection.

2. Best for Joist Hangers and Connector Hardware: Simpson SD Connector or SDS Heavy-Duty

Connector hardware needs connector-rated screws, never deck screws.

• Simpson SD Connector (#9 x 1-1/2" face-mount, #9 x 2-1/2" angled) under ICC-ES ESR-3046
• Simpson SDS Heavy-Duty (1/4" diameter) for higher-load connections under ICC-ES ESR-2236
• Wrong screw in a joist hanger is one of the most common deck failures we see at inspection

3. Best for Dock, Jetty, and Marine Structure: Simpson SDWS Timber SS

The 316 SS variant for anything near saltwater.

• Simpson SDWS Timber SS in 316 marine grade, 0.275" thick, 6" or 8" long. Dock framing's go-to.
• Simpson SDWH Timber-Hex SS, the hex-head version. What you want for heavy 6x6 dock posts and beams.
• Anything within 3 miles of saltwater needs 316 marine SS screws. The American Wood Council and Simpson Strong-Tie both back it. Coastal builders learned this the hard way pulling rusted screws out of jetties.

4. Best for Hardwood Decks and Dense Timber: Simpson DHPD (305 SS)

Built for ipe, cumaru, oak, and other dense species.

• Made in 305 SS with a paddle tip and aggressive pre-cut threads that don't snap in dense wood
• For ipe deck face-screwing: Starborn Headcote 316 SS in matching brown finish for a flush finished look
• Or pre-drill aggressively and use Eagle Claw 316 SS

5. Best for Heavy Timber and Retaining Walls: Simpson SDWS Timber and FastenMaster TimberLok

Long screws for thick wood and wall construction.

• Simpson SDWS Timber (0.220" x 8" for 4x4 timbers, 0.220" x 10" for 6x6) is the inspector-friendly pick for landscape timber walls and retaining wall connections, every 2' on center, no pre-drill needed
• For heavy crib walls and 6x6 timber connections, FastenMaster TimberLok (hex head, ICC-ES ESR-1078) replaces 3/8" lag screws and drives cleanly with an 18V cordless. Builders running 6x6 timber walls use 10-inch TimberLok screws on retaining and crib walls.
• FastenMaster HeadLok (flat head, ICC-ES ESR-1078) is the pick for shear-heavy connections, with a pull-out strength of 400 to 600 lb per inch of thread in SPF and SP
• Trade-off: even premium structural screws have limits. Coated TimberLoks can start to rust within months on a coastal deck. For coastal, switch to Simpson SDWS Timber SS

The Best Wood Screws for Every Outdoor Build

The right wood screw is the one matched to your project, your wood, and your environment, not the cheapest box on the pegboard. For outdoor work, default to 304 stainless steel screws (Eagle Claw is our pick for value), step up to 316 marine SS screws for anything coastal, and reach for Simpson SDWS or GRK RSS structural screws for ledgers and load-bearing connections. Skip the no-name "stainless steel" online listings, and check the box for the grade before you buy.

For a free sample pack of Eagle Claw deck and wood screws, head to our contractor sign-up page for 10% off your first order, or browse the full stainless steel screws collection to find the right gauge and length for your build.