Metallics TEKD37M 14 x 1-1/4 in. 3/8 Indented Hex Head Self-Drilling & Tapping Screws with Washer - #3 Drill Point - Steel Zinc - Each

The Metallics TEKD37M carries a #3 drill point, the mid-range point used for heavier gauge steel work rather than thin sheet. The manufacturer's reference figure is a 2.5 second drill time through a 1 mm thick plate, so expect fast penetration in light structural steel and slower going as plate thickness climbs. The screw body is a 14 diameter, 1-1/4 inch length fastener, which limits total grip to materials thinner than that overall length.

Both boxes are checked: the TEKD37M is flagged Buy American compliant and ARRA compliant in the manufacturer data. Country of origin is listed as multiple, so if your submittal requires a single named origin per lot, that is confirmed at the lot level rather than from the catalog spec.

No. The TEKD37M is a Type BSD self-drilling and tapping screw, which means the drill point cuts its own hole and the thread taps it in one pass. That is the whole reason to use it over a standard sheet metal screw, which needs a pilot hole. The thread is UNC at 14 threads per inch.

A 3/8 inch hex driver or socket. The indented hex washer head measures 0.367 to 0.375 inches across the flats and 0.409 inches across the corners, so a 3/8 nut setter in an impact or screw gun seats correctly. Head height runs 0.172 to 0.19 inches.

Yes, it's a hex washer head, so the washer is formed as part of the head and there is nothing separate to install. Washer outside diameter is 0.480 to 0.520 inches with a thickness of 0.030 to 0.050 inches. That extra bearing surface is what keeps the head from pulling through strap, clip, and light sheet without adding a loose washer to the job.

The TEKD37M is carbon steel with a zinc plated finish, silver in appearance. Zinc plating is a mild corrosion coating meant for dry interior and protected service, not sustained weather exposure or coastal work. For a wet or exterior run, specify a stainless self-drilling screw instead. Worth knowing: minimum torque values are the same for stainless and steel self-drill screws, so switching material does not change your driving setup.

They ship in a box of 1000, which is also the order minimum. The listed carton weight is 17 lbs with carton dimensions of 7.25 x 6.25 x 6 inches. If you need a different size or a smaller count, Metallics lists other sizes and quantities as available by request.