Metallics DWSR9B 8 x 3 in. Bugle Head Square Drywall Screws - Steel Black Phosphate - Coarse Threads - Each

Coarse thread is the right choice for wood framing. The Metallics DWSR9B is a coarse, UNC thread screw with a sharp point, and the application listed for it is drywall-to-wood. Fine thread screws are what you use for drywall over steel studs; coarse threads strip in light gauge metal and grab wood fiber instead.

For a single layer of 1/2 inch board, yes, it is longer than you need. A #8 x 3 inch screw is sized for thicker assemblies and for pulling wood to wood, double layer board, furring strips, or resilient channel build-ups. The DWSR9B is a 3 inch fastener in a drywall-wood application, so use it where the stack-up calls for that embedment and drop to a shorter screw for single layer work.

No. Black phosphate is a dry interior finish with minimal corrosion resistance, and the DWSR9B is a black phosphate steel screw intended for interior drywall and wood work. For exterior or damp locations use a coated or stainless exterior screw instead; phosphate will rust and bleed through finish.

No. The DWSR9B is listed as not Buy American compliant and not ARRA compliant, with multiple countries of origin. If your contract carries a domestic sourcing clause, this screw will not satisfy it and you need a domestically produced fastener.

They ship as a box of 2000 each, and 2000 is the order minimum, so it is a full box buy rather than a small count. The box runs about 26 lbs. If you need a different count or size, Metallics does list other sizes and quantities as available by request.

They are case hardened to Rockwell C45-64 and made from AISI 1018 steel, which is the normal spec for a hardened drywall screw. That hardness is what lets the sharp point pierce and the shank drive without stripping, but hardened screws are brittle in shear, so they are fastening hardware, not structural or framing connectors.

Because there is no single industry standard for drywall screw or bugle head dimensions. Metallics publishes the values as a guide, which is why the head width reads 0.315 to 0.363 inch and the threads per inch read 8 to 10. Slight deviations between production lots are acceptable and normal. If you are matching an existing screw exactly for a spec submittal, work from the ranges rather than one figure.