Heavy Duty Hex Lag Screws 5/16 In X 4 In A307 Grade Hot Dip Galvanized 15 Pack Built To Last For Decks And Heavy Wood Projects With Deep Wood Threads No Nut Needed Pro Grade Prime-Line 9055857

Heavy-Duty 5/16 x 4 in Hex Lag Screws, Galvanized Pack
✔️ 5/16 in x 4 in, A307 grade, hot-dip galvanized, 15-pack

These heavy-duty lag screws are designed for structural wood connections where nuts are not used. They excel in deck building, fencing, and heavy wood projects, delivering strong, reliable performance in indoor and outdoor environments.

✅ Size: 5/16 in diameter x 4 in length, hex head
✅ Material: A307 grade hot-dip galvanized steel
✅ Thread: Deep wood threads with gimlet point; nut not required
✅ Installation: Requires pilot hole; wrench or socket drive
✅ Pack size: 15 screws per pack
✅ Standards: ASME B18.2.1 and ASTM A307A

💡 What is a lag screw used for in heavy-duty wood projects? These fasteners are handy for securing structural wood assemblies where nuts can't be used or are impractical.
- Heavy-duty lag screws securely fasten decks, fences, and ledgers
- Galvanized steel resists outdoor corrosion for decks and fences
- Deep threads with gimlet point help bite into hardwoods
- Requires pilot holes and matching washers for maximum load transfer