Flat Head Structural Screws
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STARTING AT$1.53 -
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STARTING AT$8.17
Flat Head Structural Screws
Flat head structural screws are designed for heavy-duty wood-to-wood applications where strength and a clean, flush finish are critical. With aggressive threads, corrosion-resistant coatings, and a countersunk flat head design, these screws are a versatile replacement for lag bolts and traditional fasteners. They’re engineered to provide maximum holding power while sitting flush with the wood surface for a smooth, professional appearance.
Why Choose Flat Head Structural Screws?
- Flush Finish: Flat, countersunk head design sits even with the wood surface for a clean look.
- High Strength: Engineered for load-bearing applications, offering shear and withdrawal resistance comparable to or greater than lag bolts.
- Easy Installation: Self-drilling tips drive smoothly without pre-drilling in most woods.
- Corrosion Resistant: Coated and stainless options available for treated lumber and outdoor projects.
- Versatile Applications: Perfect for framing, decks, timber construction, fencing, and cross-laminated timber (CLT) builds.
When to Use Flat Head Structural Screws
Flat head structural screws are ideal when your project demands strength but also a flush, finished surface. Common applications include:
- Framing walls, beams, and posts
- Deck construction and outdoor projects
- Fastening trusses and multi-ply members
- Cross-laminated timber (CLT) and other engineered wood builds
- Any wood-to-wood application where lag bolts would traditionally be used
Flat head designs not only improve the look of your finished project, but they also help reduce interference when attaching finish materials.
Flat Head Structural Screws FAQ
What makes flat head screws different from hex head structural screws?
Flat head screws sit flush with the wood surface for a clean finish, while hex head screws protrude above the surface but allow for higher driving torque. Flat head screws are best where appearance or surface clearance matters.
Do flat head structural screws replace lag bolts?
Yes. They are designed as a high-strength, code-compliant alternative to lag bolts, offering easier installation and superior holding power without the need for pre-drilling in most cases.
Can flat head structural screws be used outdoors?
Yes. With corrosion-resistant coatings and stainless steel options, they are ideal for decks, fences, pergolas, and other exterior projects.
Do flat head screws require pre-drilling?
Not usually. Most structural flat head screws feature self-drilling tips and aggressive threads that eliminate pre-drilling, saving time and labor. In very dense hardwoods, pre-drilling may still be recommended.
Still have questions about structural wood screws? Check out our FAQ on Structural Screws, or learn What are Better: Nails or Screws.
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If you have any questions about flat head structural screws, call our Product Experts at (888) 794-1590 or email customerservice@fastenersplus.com. We’ll help you find exactly what you need.