Deck Screw
Screws · coated deck screw · star drive deck screw · exterior wood screw
Definition: A deck screw is a corrosion-resistant wood screw built for outdoor decking and exterior wood, with a bugle or flat head, self-countersinking nibs, and a star (Torx) drive.
Anatomy & Schematic
■ Head■ Shank■ Threads■ Point
Governing standards: Manufacturer specified (no universal standard)
Common Sizes
| Inch | Metric | Head width | Head height |
|---|---|---|---|
| #8 x 1-5/8 | M4 x 40 | 5/16 | bugle |
| #10 x 2-1/2 | M5 x 65 | 3/8 | bugle |
| #10 x 3-1/2 | M5 x 90 | 3/8 | bugle |
Representative sizes. Full dimensional data lives in the standards listed below.
Grades & Strength
| Grade | Material | Tensile (psi) | Marking |
|---|---|---|---|
| ACQ-coated steel | case-hardened steel + polymer coating | — | ACQ/CA approved |
| 305 / 316 stainless | stainless steel | — | For coastal use |
Materials
- ACQ-approved coated steel
- 305 stainless steel
- 316 stainless steel
Pros & Cons
Pros
- Corrosion options for treated lumber
- Usually no pre-drilling needed
- Torx drive resists stripping
Cons
- Pricier than plain wood screws
- Coating color must match the board
- Wrong coating rusts out fast
Typical Uses
- Deck boards and railings
- Fences and gates
- Outdoor furniture
- Docks and boardwalks
Alternatives & Related
- Wood Screw — Cheaper indoors, but not weather-rated
- Structural Screw — Higher shear strength for load-bearing connections
Where to Buy
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FAQ
Deck screw vs wood screw — what is the difference?
Deck screws add a corrosion-rated coating, a star (Torx) drive, self-countersinking nibs, and a cutting tip. Wood screws are plain by comparison.
What length deck screw should I use?
The screw should penetrate the joist about twice the thickness of the board — 2-1/2 in is standard for 5/4 decking on 2x joists.