Metallics DWSR7B 8 x 2-1/2 in. Bugle Head Square Drywall Screws - Steel Black Phosphate - Coarse Threads - Each

A #2 square driver. The DWSR7B uses a square (Robertson) recess, driver size #2, with a recess width of 0.110 to 0.113 in. and depth of 0.064 to 0.075 in. If your crew is set up with Phillips #2 bits only, you'll need to add square bits before these go in the gun.

Coarse thread with a sharp point is the wood-stud screw, and that is what the DWSR7B is: coarse UNC threads at 8 to 10 threads per inch, sharp point, rated by the manufacturer for drywall-to-wood applications. For light gauge steel studs you want a fine thread (and usually a self-drilling point) instead, because coarse threads strip out of sheet metal.

The DWSR7B ships as a 2500 piece box, and 2500 each is the order minimum. It isn't broken down into smaller counts. If you need a smaller quantity or a different length, other sizes and quantities in the DWSR series are available by request.

No. Black phosphate is a dry interior finish with very little corrosion resistance, and the DWSR7B is a black phosphate steel screw intended for interior drywall-to-wood work. Moisture will rust it and bleed through finished surfaces. For exterior or wet locations use a coated exterior or deck screw instead.

That's what the bugle profile is for. The DWSR7B has a bugle head measuring 0.315 to 0.363 in. across with a head height of 0.020 to 0.039 in., so the curved underside compresses the paper and seats just below the surface for mud rather than cutting through it. Set your gun clutch so the head dimples the board and stops.

No. The DWSR7B is flagged not Buy American compliant and not ARRA compliant, with country of origin listed as multiple. On a federally funded job with domestic sourcing requirements, this screw won't satisfy the clause, so a domestic-certified fastener is required.

The DWSR7B is heat treated to Rockwell C45-64 from AISI 1018 steel, which is the normal case hardened range for a collated or loose drywall screw. That hardness is what keeps the square recess from camming out and the head from twisting off at gun speed. Trade off: hardened screws are brittle in shear, so they are for drywall and wood sheathing, not structural fastening.

About 27 lbs per box, with the carton running 7.25 x 6.75 x 3.25 in. Worth knowing if you're hand-carrying boxes up scaffold or planning a pallet count for a multi-building drywall package.

It is. There's no single industry standard for bugle head drywall screw dimensions, so Metallics publishes the DWSR7B head as 0.315 to 0.363 in. wide and 0.020 to 0.039 in. high as a guide, and slight deviations within that band are acceptable. If your submittal demands a fixed head diameter, expect to specify a tolerance rather than a single value.