Metallics DWC7B 8 x 2-1/2 in. Bugle Head Phillips Drywall Screws - Steel Black Phosphate - Coarse Threads - Each

Coarse thread, UNC, running 8 to 10 threads per inch with a sharp point. Coarse thread with a sharp point is the wood-stud pattern: it bites into softwood framing and pulls the board tight. It is not the fine-thread self-drilling screw you want for steel studs. The stated field applications are wood to wood, drywall to wood, cabinet installations, and electrical, plumbing and HVAC work.

No. The DWC7B is not Buy American compliant and is not ARRA compliant, with country of origin listed as multiple. If your contract carries a domestic sourcing clause, these will not satisfy it.

A #2 Phillips. The recess is 0.124 inch deep and 0.176 to 0.201 inch across, which is standard #2 geometry, so a worn bit will cam out and chew the recess. Three power bits are included with the box, so you have spares on hand as the first one dulls.

Black phosphate is a dry-interior coating. It gives mild corrosion resistance and a surface that holds joint compound and paint, but it is not a weather coating. Keep these Metallics screws inside for drywall, cabinet and wood framing work, and use a coated or galvanized exterior fastener anywhere exposed to moisture.

They are case hardened to Rockwell C45-64 on AISI 1018 steel, which is the normal hardness band for drywall screws. That hardness lets the sharp point start in wood without a pilot, but a hardened screw is brittle in shear, so do not use them as a structural or load-bearing fastener. They are a sheathing and cabinet-hanging screw, not a framing screw.

That is what the bugle profile is for. The head measures 0.315 to 0.363 inch across with a head height of 0.020 to 0.039 inch, so it seats into the paper face and dimples rather than tearing through. Set your driver clutch or depth stop so the head sits just below the surface and the recess fills with compound.

No, and Metallics says so directly: there is no single industry standard for bugle head or drywall screw dimensions, so the published head and recess figures are a guide and slight deviations are acceptable. If you are matching an existing fastener for an exposed or dimensioned detail, treat the numbers as nominal rather than a tolerance you can hold.