Metallics DWSR9M 8 x 3 in. Bugle Head Square Drywall Screws - Steel Black Phosphate - Coarse Threads - Each

A #2 square (Robertson) bit. The DWSR9M uses a square drive recess measuring 0.110 to 0.113 in. wide and 0.064 to 0.075 in. deep, so a standard #2 square driver seats fully. Square drive resists cam-out better than Phillips when you are running long screws with a collated or clutch gun.

Yes, that is exactly what the DWSR9M is built for. It is a #8 diameter, 3 in. long coarse thread screw with a sharp point, rated by Metallics for drywall-to-wood applications. Coarse threads and the sharp point bite softwood framing without pre-drilling. At 3 in. it is long enough for double-layer board, furring over wood, or thick panel buildups. For drywall over steel studs you want a fine thread with a self-drilling point instead.

No. Black phosphate is a dry interior finish only, and the DWSR9M is a steel black phosphate screw. It gives mild corrosion resistance and helps joint compound adhere, but it will rust in exposed or wet conditions. For decks, soffits, or any damp area use a coated or stainless exterior screw instead.

No. The DWSR9M is not Buy American compliant and is not ARRA compliant, with country of origin listed as multiple. If you are buying for a federally funded project with domestic sourcing requirements, this screw will not satisfy them.

The DWSR9M ships as a box with a 1,000 piece minimum, so a full box is the smallest purchase. Box weight is listed at 13 lbs. Metallics notes other sizes and quantities are available by request.

Yes. The bugle head is the reason to use this screw on board: its head is only 0.020 to 0.039 in. tall and 0.315 to 0.363 in. across, so it dimples into the paper face and sits flush for mudding rather than cutting through. Set your gun depth so the head seats just below the surface.

The DWSR9M is case hardened to Rockwell C45-64 from AISI 1018 steel. That hardness is what lets the sharp point self-start in wood, but hardened drywall screws are brittle in shear by nature, so they are fastening hardware for board and trim, not a structural or load-bearing fastener. In dense or dry hardwood framing, pre-drill to avoid snapping heads.

Coarse UNC threading at 8 to 10 threads per inch on a #8 diameter shank. Metallics is explicit that there is no single industry standard for drywall screw dimensions, so the published values are a guide and slight deviations are acceptable. If you are matching an existing specified fastener exactly, work from the #8 x 3 in. coarse designation rather than the pitch range.

Within reason. The field application on the DWSR9M is drywall-wood, and the bugle head with a sharp point works for pulling board, furring strips, and light wood-to-wood trim work. It is not a deck screw and not a structural wood screw, so for framing connections or anything carrying load, specify a fastener rated for that use.