Description
Our Straw Rope Screws (also known as Wafer Head Timber Screws) are heavy-duty fasteners designed for structural wood applications. Featuring a unique double thread (dual start) design, these screws drive twice as fast as standard wood screws and provide exceptional resistance to loosening caused by vibration or thermal expansion. The large diameter wafer head provides maximum bearing surface without crushing the wood fibers.
Why “Double Thread” Matters
The engineering behind the dual-start thread provides distinct advantages over single-thread screws:
| Feature | Double Thread Screw | Single Thread Screw |
|---|---|---|
| Driving Speed | 2x Faster | Standard |
| Withdrawal Load | Higher (More thread engagement) | Standard |
| Vibration Resistance | Excellent (Less likely to back out) | Fair |
| Best Application | Structural framing, decking, fencing | General carpentry, furniture |
Coating & Environmental Resistance
Choosing the right coating is vital for structural longevity:
| Coating Type | Salt Spray Life | Application Scenario |
|---|---|---|
| Ruspert (Silver) | 500 – 1000 hrs | Decks, fences, coastal areas |
| Hot Dip Galvanized (HDG) | 1000+ hrs | Heavy timber framing, ground contact |
| Yellow Zinc | 48 hrs | Interior framing, dry environments |
| Black Phosphate | 24 hrs | Interior furniture, pallets |
Head Style Comparison
Select the correct head for the job:
| Head Style | Description | Use Case |
|---|---|---|
| Wafer Head | Thin, wide head (like a washer) | Straw Rope Screw – Attaching beams, ledger boards |
| Bugle Head | Curved underside | Drywall, decking (countersinks itself) |
| Hex Head | External hex with flange | Heavy timber, structural connectors |
