Best Deck Screws & Hidden Fasteners

Every deck needs three different fasteners

Most homeowners buy one type of screw and use it everywhere. That's a mistake. A well-built deck actually uses three: structural screws for framing and ledger connections, deck board screws (or hidden clips) for the walking surface, and trim screws for fascia and railings. Each job has a different pullout demand and corrosion exposure.

Structural screws for framing

Ledger boards, beam-to-post connections, and rim joists carry the entire load of your deck — this is not the place for standard 3" deck screws. Use engineered structural screws:

• GRK RSS or FastenMaster LedgerLOK — ICC-approved for ledger attachments, replaces the old 1/2" lag bolt + washer combo, installs in one pass with a drill.
• Simpson SDWS Timber Screws — the go-to for beam-to-post and post-to-header connections.
• Always match the coating to your wood: HDG (hot-dip galvanized) for standard ACQ, stainless for coastal or cedar.

Deck board fasteners — the walking surface

You have three real options here:

1. Coated deck screws (face-fastened). Cheapest and strongest. Look for a "Climate Coat" or "Epoxy Coated" #10 x 2-1/2" or 3" screw rated for ACQ/MCA. Deckmate, Grip-Rite Prime Guard MAX, and Power Pro Premium are all solid. Downside: you'll see 200+ screw heads on the finished deck.
2. Stainless steel deck screws. Non-negotiable for cedar, redwood, ipe, and coastal decks. Type 305 for most jobs; Type 316 within 5 miles of salt spray. Muro, Simpson, and FastenMaster all offer T-star drive stainless screws that won't cam out.
3. Hidden fastener systems. Camo Edge, Cortex plugs, Trex Hideaway, and TigerClaw clips give you a clean, screw-free surface. Cost per sqft is 3–5× face screws but hides fasteners entirely. Required for premium composite installs and highly recommended for anything anyone will see up close.

Which fastener for which board?

• Pressure-treated pine: Coated deck screws (Deckmate) or ceramic-coated stainless. Face-fasten — hidden fasteners split PT boards over time.
• Cedar / redwood: Stainless steel, always. Tannins in cedar corrode standard coatings and leave black streaks across the boards.
• Tropical hardwoods (ipe, cumaru): Stainless 305 or 316. Pre-drill and use a plug system (Starborn, Ipe Clip) — hardwood is too dense for hidden groove clips.
• Capped composite: Manufacturer-approved hidden fastener system (Trex Universal, TimberTech Cortex). Face screws void the fade/stain warranty on most brands.

How many screws to buy

Face-fastened, 16" OC joists, 5/4×6 boards: roughly 350 screws per 100 sqft. A 5 lb box (~350 screws) covers about 100 sqft plus waste. Hidden fastener systems typically ship coverage on the box (e.g., 90 clips per 50 sqft for Trex Hideaway). Estimate exactly with our deck fastener calculator.

What to skip

• Interior wood screws or drywall screws. They'll rust and snap within one season.
• Painted "outdoor" screws under $12/lb. The paint chips off in the drill and rust starts at the screw head.
• Nails on decking boards. They back out with seasonal expansion — a leading cause of trip hazards. Fine for framing; wrong for the walking surface.

Bottom line

For a pressure-treated deck: GRK RSS for ledgers, Deckmate or Grip-Rite Prime Guard MAX for boards. For cedar/redwood: switch to Muro or Simpson stainless. For composite: Camo Edge or Trex Universal Hideaway. Buying a mix of the right screws costs $150–$300 more than the "one-box-fits-all" approach and adds 5+ years to your deck.