The Wood Construction Screw (featuring a low-profile Wafer Head) is the modern replacement for traditional lag bolts in heavy timber framing. Engineered for speed and strength, our Wood Construction Screw incorporates a specialized Torx Drive system and a mid-shaft knurling feature, allowing builders to drive long fasteners into solid hardwood and softwood without pre-drilling, saving massive amounts of labor time on the job site.

Product Overview: Manufactured from heat-treated C1022A Carbon Steel and finished in Yellow Zinc Plating, this Wood Construction Screw offers superior corrosion resistance and high shear strength. It is the go-to fastener for log homes, decking substructures, railway sleepers, and structural carpentry.

Wood Construction Screw Specifications

Product Name	Wood Construction Screw / Structural Timber Screw
Head Style	Wafer Head (Large Flat Bearing Surface)
Drive Type	Torx / Star Drive (T25, T30, T40)
Special Feature	Knurled Shank (Reamer) & Type 17 Cutting Point
Material	Hardened Carbon Steel C1022A
Finish	Yellow Zinc Plated (CR+3)

Engineering Insight: Why use a Construction Screw?

The Wood Construction Screw is packed with engineering features designed to solve common carpentry headaches:

The Knurling (Reamer): You will notice a ribbed section on the shank above the threads. This “reamer” slightly enlarges the hole in the wood as the screw enters. This reduces friction on the unthreaded shank, preventing the screw from snapping due to overheating and reducing the torque required by your power drill.
The Type 17 Point: The notched point acts like a drill bit, cutting through wood fibers rather than splitting them. This allows edge-fastening without the risk of cracking the timber.
Wafer Head vs Hex Head: The broad, flat Wafer Head provides immense “pull-through” resistance, acting like a built-in washer. Its low profile also allows cladding or drywall to be installed over it easily.

For more details on screw drive types like Torx, please refer to the Torx entry on Wikipedia.

Application: Structural Framing

These screws are ICC-ES compliant (depending on certification) for use in:

Ledger boards for decks
Truss and rafter connections
Log cabin assembly
SIP (Structural Insulated Panel) installation

Frequently Asked Questions (FAQ)

Q: Do I need to pre-drill?
A: For most softwoods (Pine, Fir), no. The Wood Construction Screw is self-drilling. For extremely dense hardwoods (Oak, Ipe), a pilot hole is still recommended to prevent snapping.

Q: Is Yellow Zinc rust-proof?
A: Yellow Zinc offers good corrosion resistance for outdoor use, but for marine environments or within 5 miles of the coast, we recommend our Stainless Steel A4 versions or specialized ceramic coatings (Ruspert).