Metallics WDW1B 8 x 1/2 in. Wafer Head Phillips Sharp Point Drywall Screws - Steel Zinc - Each

The WDW1B ships in a box of 10,000 pieces, and 10,000 each is the order minimum. It's a bulk buy, so it suits a contractor or MRO stockroom running screws continuously rather than someone needing a handful. Other sizes and quantities are available by request.

No. The WDW1B is not Buy American compliant and is not ARRA compliant, with country of origin listed as multiple. On a federally funded project with domestic sourcing requirements you'll need a domestically manufactured fastener instead.

The wafer head on the WDW1B sits low and spreads load over a large bearing surface, measuring 0.426 to 0.446 inch across and only 0.082 to 0.098 inch tall. That combination is what you want when clamping thin or soft material you don't want to pull through, and where head height has to stay out of the way of the next layer. A bugle head countersinks into paper-faced board instead; these are not interchangeable for finished drywall work.

Phillips drive, #2 driver size, and three power bits are included with the box. Anyone running these on a screw gun should still stock spares, since a #2 Phillips wears out long before 10,000 screws are driven.

They're heat treated to Rockwell C28-38 with a minimum torsional strength of 45 Kg/cm, made from AISI 1018-1022 steel. That's what lets the sharp point pierce and tap thin material under a screw gun without the shank twisting off. Driving into heavy structural steel is outside what a self-piercing screw is built for.

Zinc plated carbon steel is the finish here, which handles dry interior service and incidental moisture. For sustained exterior exposure, wet locations, or coastal air, step up to a stainless or coated exterior-rated fastener instead; zinc plating on a 1018-1022 steel screw will corrode in those conditions.

Fine thread. The WDW1B uses a UNF thread form, which is the pitch you want when tapping into metal studs or light gauge sheet rather than wood framing. Coarse thread screws are the wood-framing choice.

The box runs 36.95 lbs, at 9 x 9 x 6.13 inches. Worth knowing if you're staging material on a floor by hand or planning shelf space in a stockroom.