Hex Lag Screw 5/16in X 3-1/2in A307 Grade A Hot Dip Galvanized Steel 25PK Size: 5/16 inch X 3-1/2 inchHeavy duty wood screw with 6 sided hex bolt headFeatures deep wood screw threads and does not accept a nutUsed in applications where standard wood screws cannot support the load (deck building, etc.2. They are ideal for use on decks since installation can be accomplished without having access to both ends of the fastener, as opposed to standard hex bolts that require a nut on the opposite end.)Requires pilot hole to be drilled and installs using wrench or socket toolThread Type: Deep, Point Style: GimletSpecification(s) Met: ASME B18.
They are ideal for use on decks since installation can be accomplished without having access to both ends of the fastener, as opposed to standard hex bolts that require a nut on the opposite end.