Metallics WDW1M 8 x 1/2 in. Wafer Head Phillips Sharp Point Drywall Screws - Steel Zinc - Each

The WDW1M ships as a box of 1,000 screws, and 1,000 is also the order minimum. It is sold by the thousand, not in small counts, so plan on a full box per order.

The WDW1M has a sharp point that pierces and taps its own hole, which works in drywall over light gauge material. It is a self-piercing and tapping drywall screw, not a drill point screw, so for heavier gauge steel you want a self-drilling (point type) screw instead.

No. The WDW1M is not Buy American compliant and is not ARRA compliant; country of origin is listed as multiple. If your project carries domestic sourcing requirements, this screw will not satisfy them.

A #2 Phillips bit. The drive is Phillips and Metallics includes a free power bit in the box, so you are not hunting for one on the truck.

The wafer head on the WDW1M sits low and spreads load over a large bearing surface, measuring 0.426 to 0.446 in. across and 0.082 to 0.098 in. tall. That combination clamps thin material without pulling through and keeps the head close to flush where clearance is tight, which is why it shows up on bracket and strap work rather than paper-faced board finishing.

Case hardness on the WDW1M runs Rockwell C28-38 with a minimum torsional rating of 45 Kg/cm, made from AISI 1018-1022 steel. That is the normal hardness band for a tapping screw of this class, hard enough to form its own thread without shearing the head under a standard screw gun.

These are zinc plated carbon steel, which is an indoor, dry-location finish. Zinc plating slows corrosion but is not a substitute for hot dip galvanized or stainless in exterior, wet, or corrosive locations.

Metallics lists the WDW series for electrical, plumbing, heating and air conditioning work. In practice that is fastening straps, plates, low voltage brackets, and light metal accessories where a 1/2 in. screw is all the grip you need and a low profile head keeps the part flat.

Treat them as a guide. Metallics states there is no single industry standard for self-piercing screw dimensions, so the head width and height ranges given for the WDW1M can deviate. If a part has a tight counterbore or slot, check one screw against it before running a full box.