🔩 Heavy-Duty 4-Inch Lag Screws for Demanding Structural Projects
When your deck, timber frame, or pole barn demands a fastener that holds tight without compromise, these #14 x 4-inch structural lag screws deliver. Engineered for outdoor and heavy-load applications, the 50-pack from Goobetter gives you a professional-grade, corrosion-resistant solution right out of the box. The black oxide coating has survived a 1000-hour salt spray test, so you can trust these screws to withstand rain, humidity, and the long haul. The T30 star drive eliminates cam-out, and the knurled shank drives smoothly while helping prevent wood splitting. Whether you’re building a backyard deck, securing landscape timbers, or framing a workshop, these washer-head lag screws provide the holding power and clean finish you need — without the rusty surprises.
⭐ Why Choose Goobetter 4″ Structural Wood Screws?
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1000-Hour Salt Spray Tested: The advanced black oxide coating provides long-lasting anti-rust protection, even in harsh outdoor environments.
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T30 Star Drive System: The included T30 bit and precision star drive ensure a slip-free, efficient fastening experience on every screw.
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Knurled Shank Reduces Splitting: The specially designed shank lowers insertion torque and guards against wood cracking — a must for hardwoods and near edges.
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Modified Truss Washer Head: The flattened, wide bearing surface sits flush, delivering a neat, professional appearance while distributing clamping force evenly.
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Multipurpose Construction Grade: Ideal for decks, log construction, timber framing, pole barns, and heavy-duty home improvement projects.
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Complete Kit in Recyclable Packaging: You get 50 lag screws plus 1 T30 star drive bit in compact, eco-friendly storage that doesn’t clutter your workshop.
📋 Specifications: #14 x 4″ Lag Screws (50 PCS)
| Material |
Carbon Steel |
| Head Style |
Flat (Modified Truss Washer Head) |
| Exterior Finish |
Black Oxide (Anti-Corrosion) |
| Thread Size |
1/4 in x 4 in (#14 x 4″) |
| Point Style |
Flat Point |
| Drive Style |
T30 Star Drive |
| Quantity |
50 Lag Screws + 1 T30 Star Bit |
| Corrosion Resistance |
Passed 1000-Hour Salt Spray Test |
| Packaging |
Reusable, Environmentally Friendly Box |
❓ FAQ – 4 Inch Exterior Lag Screws
🛡️ Can these screws be used with pressure-treated lumber?
Absolutely. The black oxide coating is compatible with modern ACQ and CA-treated woods. Combined with the 1000-hour salt spray rating, these lag screws resist corrosion even when exposed to the chemicals and moisture typical of treated lumber.
🔧 What driver bit do I need, and is one included?
You need a T30 star bit. We include one high-quality T30 bit in every box, so you can start fastening right away. Any standard T30 power bit or hand driver will also work.
🌲 Will these wood screws split the timber?
The knurled shank is designed to reduce driving torque and minimize the chance of splitting, even when working close to board ends or in dense hardwoods. For maximum protection, pre-drilling with a 3/16″ pilot bit is recommended in brittle materials.
🏡 Are they suitable for outdoor decks and log homes?
Yes — this is exactly what they’re built for. The washer head provides a clean flush fit for deck boards and structural framing, while the robust corrosion resistance keeps them performing season after season in outdoor environments.
📦 How many pieces come in the box?
You’ll receive 50 lag screws and 1 T30 star drive bit packed in a sturdy, reusable storage box. The packaging is compact and environmentally friendly, so it stores easily and creates less waste.
🔩 Are these fully threaded lag bolts?
These are structural lag screws with a partially threaded shank — the smooth upper portion combined with the knurled design helps draw boards tight and reduces splitting. The thread length is optimized for heavy-duty timber connections.
