Lag Screws feature a Hex Head and are designed to be driven with a wrench or hex driver. Lag screws are also commonly called Lag Bolts because they are significantly larger than most other screws. Essentially, a Lag Screw is just a very large wood screw. They feature the sharp cutting threads of a wood screw, or sheet metal screw and have a shoulder below the head (in longer lengths), however everything is scaled up in size for use in larger applications.
Lag Screws are typically used in heavy duty carpentry applications including lumber framing and anchoring equipment to wood such as machinery and large vices.
Hot Dip Galvanized Lag Screws are commonly used in exterior applications due to the corrosion and rust resistance of Hot Dip Galvanized Steel.
Hex Lag Screws in 3/8" diameter are Partial Thread in lengths 1" and over