Lag Screw, 1/2 in, 4-1/2 in, Steel, Zinc Plated Hex Hex Drive, 25 PK Lag bolts are designed for securely fastening heavy timbers to one another, or to fasten wood to masonry or concrete..
Machine screws are used in fastening nearly all types of hard materials.#10-24 x 6 in Phillips Flat Machine Screw, Plain Stainless Steel, 5 PK Commonly used with flat or lockwashers. Especially useful in metal-to-metal or where heavy duty fastening is required..