Drywall Screws are also known as sheetrock screws, plasterboard screws, multipurpose Phillips head wood screws. If used as an all purpose wood screw, use for interior application. Black/Gray phosphate coating. Drywall screws have become the standard fastener for securing full or partial sheets of drywall to wall studs or ceiling joists.Drywall screws' lengths and gauges, thread types, heads, points, and composition at first might seem incomprehensible. Coarse drywall screws feature coarse threads to secure drywall boards to studs. Finedrywall screws feature smaller heads and are used to secure drywall to metal studs. Self-drilling screws and pan-head screws can be used with metal studs or frames. Most installation guides and resources identify drywall screws as Type S and Type W. But most often, drywall screws are simply identified by the type of thread that they have.Drywall screws either have a coarse or a fine thread. Drywall screws are hardened so that the Phillips slots won't strip out under the stress from high-speed screw guns. Wood screws are thicker and made of softer metal, making them more snap-resistant. Different thread patterns make the screws work slightly differently too. Most common — 1-1/4”: Use 1-1/4” drywall screws to secure 1/2" drywall installed on wood-stud walls. These coarse-thread screws typically feature phosphate coatings, which better protect against rust compared to zinc coatings.  A screw directly into drywall will not hold. You need to use some type of picture hanging hardware to hang a heavy picture securely. The threads of a screw into only drywall, without an anchor, will NOT permanently hold in the drywall. It will just pull right back out sooner or later. When working with 1/2-inch drywall panels, use 1-1/4 or 1-3/8-inch nails or screws. When working with 5/8-inch drywall panels, use 1-3/8-inch or 1-5/8-inch screws. ... In most cases, securing drywall will require fewer screws than nails. Double-nailing panels will help minimize the occurrence of nail pops.