.png?width=180&quality=75&format=webp){kind=logo}
Representative image of the #7 x 2-1/4"" Self-Tapping Metal Joist line. Packaging, size and piece count vary by the option you select below.
#7 x 2-1/4"" Self-Tapping Metal Joist
T15 / 410 SS
Select Option
Choose your preferred option and quantity below.
Black
7x2-1/4-STMJ-BL
—
Stainless Steel
7x2-1/4-STMJ-SS
—
About this product
This is a specialized 410-grade stainless steel fastener engineered for securing dense tropical hardwood decking to metal joist systems. It features a self-tapping auger tip that pierces steel or aluminum substructures without the need for pre-drilling the joist, solving the problem of fastening exotic wood to modern metal framing. It is designed specifically for contractors and homeowners building high-end decks, docks, and rooftop systems where wood joists are replaced by metal for longevity.
Manufacturer Specifications
- Material
- 410 Grade Stainless Steel
- Finish Options
- Bright Stainless or Black Xylan Coating
- Length
- 2-1/4 inch
- Diameter
- #7 Gauge
- Drive Type
- T15 Star Drive
- Point Type
- #3 Drill Point (Self-Tapping)
- Head Type
- Trim Head with under-head nibs
- Compatible Joist Gauge
- 12 gauge to 14 gauge metal
Best used for
- 1Fastening 5/4" thick Ipe or Cumaru decking to residential steel joist framing systems.
- 2Installing Garapa or Tigerwood boards on luxury rooftop decks utilizing aluminum substructures.
- 3Securing Massaranduba or Red Balau boardwalk planks to galvanized steel supports in commercial or public infrastructure.
- 4Face-fastening hardwood cladding or fencing to metal stud systems in modern architectural applications.
Pro tips for dense hardwoods
- Always pre-drill a 1/8 inch pilot hole through the hardwood decking board to prevent splitting; the screw's self-tapping feature is only intended for the metal joist.
- Use a clutch-equipped screw gun rather than an impact driver to avoid snapping the screw heads when driving into high-density species like Ipe or Cumaru.
- When building in coastal environments, choose the Xylan-coated black variant to provide an extra barrier against galvanic corrosion between the stainless fastener and steel joist.
- Ensure the screw penetrates at least 3 full threads into the metal joist for maximum pull-down strength and long-term hold.
Specifications
- Brand
- DeckWise
- Category
- Screws & Fasteners
- Options available
- 2 sizes / package counts
Why Choose Screws & Fasteners?
How to Face-Screw Hardwood Decking
Pre-Drill Every Hole
Dense hardwoods (1,500+ Janka) will split without a pilot hole. Use a countersink bit sized for your screw shank — this is non-negotiable for Ipe, Cumaru, and similar species.
Choose Stainless Steel
Carbon steel screws corrode and stain hardwood within months. Always use Type 316 stainless steel — it offers the best corrosion resistance for exotic hardwoods and coastal environments. The slight premium pays for itself in zero staining and no fastener failures.
Drive to Depth — Not Beyond
Set screws flush with the surface or just barely countersunk. Over-driving creates water-collecting craters that accelerate checking around each hole.
Two Screws Per Joist Crossing
Place one screw roughly 1″ from each board edge at every joist. This prevents cupping and ensures the board stays flat over time.
Pro Tip from Our Deck Specialists
Apply a drop of wax or soap to each screw tip before driving — it dramatically reduces friction and prevents snapped screw heads in ultra-dense wood like Ipe.
Screws & Fasteners — Common Questions
Frequently Bought Together
Accessories that pair well with screws & fasteners for a complete installation.
Ships Nationwide
Fast LTL freight delivery
Quality Guaranteed
Professional-grade products
In Stock
Ready to ship today
Expert Support
Call 1-844-674-4455