Metallics TEKDHH65M 10 x 3/4 in. 5/16 High Hat Hex Head Self-Drilling & Tapping Screws with Washer - #3 Drill Point - Steel Zinc - Each

No. It's a Type BSD self-drilling and tapping screw with a drill point, so it cuts its own hole and forms its own thread in one pass. Drive it with a 5/16 hex driver and keep steady pressure so the point bites instead of skating.

It's a bonded metal washer head, not a sealing washer. Washer OD runs 0.364 to 0.414 in., which spreads clamp load over sheet metal and keeps the head from pulling through thin panel. There is no rubber or EPDM bonded seal, so for weather-exposed roof or siding penetrations you want a separate sealing washer screw instead.

Zinc plated carbon steel, so it's built for dry interior work: strut, raceway, enclosures, sheet metal duct and framing inside a conditioned building. Zinc on steel will corrode in continuous moisture, salt air or chemical exposure, so for exterior or wet locations step up to a stainless or coated-for-exterior fastener.

16 threads per inch on a #10 diameter, manufactured to SAE J78 - 2013 for self-drilling tapping screws. Steel is AISI 1016 to 1024, case hardened to Rockwell C32-40, with 61 lb-in minimum torsional strength. That torsional figure is the number to watch if you're driving with a high-torque impact: exceed it and you'll twist heads off rather than seat them.

The TEKDHH65M is flagged compliant for both ARRA and Buy American in the manufacturer's data, which is what a government, school or healthcare procurement spec usually asks for on fasteners. Country of origin is listed as multiple, so if your contract requires a single named origin on the submittal, confirm the origin of the specific lot you receive.

At 3/4 in. overall length with a #3 drill point, most of the shank is available for thread engagement once you're through 0.110 to 0.175 in. panel. The point itself consumes part of that length, so if you're fastening a bracket or strut of any real thickness on top of the panel, measure your total stack first; a longer screw in the same series is the fix when the stack exceeds what 3/4 in. can reach through and still tap.

It ships as a box of 5,000 pieces, which is the order minimum. That's a job-stock quantity, not a handful, and the box runs 32.5 lbs. Plan storage accordingly if you're ordering for a single panel or a small retrofit.

The high hat profile gives the hex driver more depth to grab, so the bit is less likely to cam out when the drill point is working through heavier gauge. That matters on 0.110 to 0.175 in. panel where the screw spends real time drilling before it taps. A low pan head with a Phillips drive will strip in that situation; a plain hex washer head works but offers less driver engagement than the high hat.