Metallics DWSR3B 6 x 1-1/4 in. Bugle Head Square Drywall Screws - Steel Black Phosphate - Coarse Threads - Each

No. Black phosphate is a mild corrosion coating meant for dry interior work, which is what the DWSR3B's steel black phosphate finish is for. For exterior sheathing, soffits, or anywhere exposed to moisture or treated lumber, use a coated deck or exterior screw instead. Interior framing and board under a finished roof is where these belong.

No. The DWSR3B is not Buy American compliant and not ARRA compliant, and country of origin is listed as multiple. If your spec carries a domestic sourcing clause, these will not clear it and you need a domestically manufactured fastener instead.

A #1 square (Robertson) bit. The recess on the DWSR3B measures 0.090 to 0.106 inch wide and 0.055 to 0.071 inch deep, which is the #1 square profile. A #2 square bit will not seat and will cam out. Square drive is the usual pick when you are driving thousands of screws with a collated or standard screw gun because the bit stays in the recess without pressure.

Yes. The bugle head on the DWSR3B has a tapered underside that compresses the face paper rather than cutting it, so it dimples just below the surface ready for compound. Head width runs 0.315 to 0.347 inch and head height 0.020 to 0.031 inch, so it covers enough area to resist pull-through while staying shallow enough to skim over with one or two coats. Set your gun depth so the head is just below flush, not buried.

They ship by the box of 8,000 pieces, with the order minimum set at 8,000 each. The box weighs 32.8 lbs. That is bulk-hanging quantity, enough for a sizeable multi-family or commercial board job rather than a one-room patch.

The DWSR3B is case hardened to Rockwell C45-64 on AISI 1018 steel. That hardness is what lets the sharp point pierce board and start into a wood stud without a pilot hole. Hardened drywall screws are brittle in shear by nature, so they are fine for fastening board but should not be used as a structural or framing fastener where lateral load is carried.

Thread count runs 8 to 10 threads per inch in a coarse UNC form. That wide pitch is what gives the screw grip in wood fiber, where a fine thread would strip. On the DWSR3B it is paired with a sharp point so you drive straight into the stud with no pre-drilling.

No, and Metallics says so directly: there is no single industry standard for drywall screw or bugle head dimensions, so the published figures are a guide and slight deviations occur. Practically that means the 0.315 to 0.347 inch head width and 8 to 10 TPI on the DWSR3B are ranges, not fixed values. Driver fit and length are what matter on the job, and the #1 square recess is consistent.