Metallics QTEKD20 12 x 3/4 in. 5/16 Head Quadrive Self-Drilling & Tapping Screws - #3 Drill Point - Domestic Steel Zinc - Each

The Metallics QTEKD20 is a #3 drill point screw, which is the heavier-gauge point in the self-drilling range: it drills and taps its own hole in structural-weight sheet steel without a pilot hole. A #2 point handles light gauge; the #3 is what you reach for on heavier steel studs, strut, and channel. At 3/4 inch overall length the usable grip is short, so it is for fastening into a single member rather than stacking thick material.

No pilot hole needed. The QTEKD20 is a self-drilling and self-tapping screw with a drill point, so it cuts its own hole and forms its own thread in one pass. Run it at moderate speed with steady pressure and back off once the head seats so you do not strip the tapped thread.

Quadrive is a square-recess drive, so you drive it with a square (Robertson-style) bit rather than a Phillips. The head is a 5/16 size. Have the matching square bits on the gun before the crew starts, since a Phillips bit will cam out and chew the recess.

The QTEKD20 is domestic steel with zinc plating. Zinc plating is a mild indoor-grade finish, fine for interior electrical work, conduit straps, strut, and sheet metal inside a building. For exposed exterior or damp locations, specify a screw with a heavier coating or stainless.

Yes. The QTEKD20 is domestic steel and stated as made in the USA, which is what procurement officers on federally funded and Buy American specified work need on the submittal.

QTEKD20 is the Metallics part number: #12 diameter, 3/4 inch length, 5/16 head, Quadrive drive, #3 drill point, zinc plated domestic steel. Order by that number to avoid being shipped a Phillips or hex-washer-head equivalent.