Metallics WDS3B 8 x 1 in. Wafer Head Phillips Drywall Screws - Steel Zinc - Each

No. The WDS3B is zinc-plated carbon steel, which is a dry interior finish only. Exterior soffits, canopies, coastal work, or damp mechanical rooms will rust these out. For those openings go to a stainless or a coated exterior-rated self-drilling screw instead.

No on both counts. The WDS3B is listed as not Buy American compliant and not ARRA compliant, with country of origin recorded as multiple. If your government, school, or transit spec carries a domestic sourcing clause, this fastener will not clear it.

A #2 Phillips bit. Three power bits ship in the box, so you are not hunting for a driver on the first run. The recess is 0.176 to 0.189 in. diameter and 0.255 in. deep, which is what lets a #2 seat without cam-out at drive speed.

A wafer head gives a wide, thin bearing surface: 0.359 to 0.38 in. across the head and only 0.025 to 0.035 in. thick. That spreads clamping load over soft or thin material without pulling through, and sits nearly flush instead of dimpling in like a bugle head. Bugle head is what you want when the screw is going into paper-faced drywall and getting mudded over; wafer head is the choice for fastening strapping, track, plates, and panel material where you need hold-down without a countersunk dish.

The WDS3B ships boxed with a 10,000-piece minimum, sold each. It is a bulk production quantity, not a contractor jar, so plan it as stock for a full job or a shop shelf rather than a punch-list buy. Metallics lists other sizes and quantities in the WDS line by request.

18 threads per inch, UNF, to SAE J78-2013, which is the governing standard for self-drilling tapping screws. The fine pitch is what gives thread engagement in thin sheet; it taps and holds across the rated 0.100 to 0.350 in. panel range. One caution: fine thread does not bite well in wood or in gypsum alone, so this is a metal-substrate screw.

Minimum torsional strength is 42 lb-in, with a case hardness of Rockwell C32-40 on AISI 1016-1024 steel. That is standard self-drilling screw specification, and Metallics notes drill time of about 2.5 seconds through a 1 mm plate. Snapped heads on a run of these usually mean the gun is being leaned on after the point breaks through rather than a screw problem, so back the clutch off once it seats.