Especially useful in metal-to-metal or where heavy duty fastening is required. Machine screws are used in fastening nearly all types of hard materials.#10-24 x 1 in Combination Phillips/Slotted Truss Machine Screw, Zinc Plated Steel, 25 PK Commonly used with flat or lockwashers..
Sheet Metal Screw, #14 x 3 in, Zinc Plated Steel Flat Head Phillips Drive, 12 PK Sheet metal screws make excellent fasteners for attaching metal hardware to wood because the fully threaded shank provides good retention in wood..