Hillman 3/8 in x 7 in Hex Lag Screw is built for serious timber work. With a 3/8 inch diameter and a full 7 inch length, these lag screws bite deep into structural lumber, delivering dependable, high-strength connections for outdoor and heavy-duty projects. The hex head accepts a socket or wrench for a secure, high-torque drive, so you won’t struggle with stubborn fastenings in dense wood or tight spaces.
Designed to endure the elements, the hot-dip galvanized coating provides superior corrosion resistance, making these lag screws an ideal choice for decks, fences, pergolas, railing systems, and other exterior woodwork that lives in moisture-prone or outdoor environments. The coating also helps protect against rust and staining, so your handiwork stays solid and looking sharp for years.
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Coarse-threaded steel delivers quicker bite and strong holding power in softwoods and treated lumber, reducing drive time and minimizing wood stripping.
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7" length ensures deep engagement for robust connections, improving withdrawal resistance and overall stability of your structure.
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Bulk convenience — 50-count boxed pack keeps you equipped for large projects or frequent repairs without constant trips to the store.
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Versatile exterior applications — ideal for attaching beams, posts, bracing, or wide timber-to-timber joints where maximum strength is essential.
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Reliable drive — hex head supports easy installation with common tools, even in crowded frames or when access is limited.
Ideal use cases
- Deck framing and railings where outdoor durability is a must
- Fence construction and gate assemblies that endure weather and stress
- Timber framing, pergolas, and outdoor structures requiring deep, strong connections
- Repairs or replacements in existing wooden structures needing high pull-out resistance
Pro tips for best results: plan for pilot holes to minimize wood splitting, start driving with a steady, controlled motion, and avoid over-tightening to preserve wood integrity. Pair these lag screws with appropriate washers when load distribution is a concern, and choose the right driver for a secure, flush finish every time.
