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.3/18"-16 x 3 in Phillips Flat Machine Screw, Zinc Plated Steel, 25 PK Commonly used with flat or lockwashers..
.Sheet Metal Screw, #14 x 3/4 in, Zinc Plated Steel Pan Head Square Drive, 100 PK Sheet metal screws make excellent fasteners for attaching metal hardware to wood because the fully threaded shank provides good retention in wood.
Use trim head drywall screws for finished work in wood.board, wood, sheet metal, plywood, and some plastics.Drywall Screw, #6 x 1-5/8 in, Steel, Flat Head Phillips Drive, 230 PK Use trim head drywall screws for finished work in wood.