Metallics QTEKD6M 10 x 3/4 in. 5/16 Head Quadrive Self-Drilling & Tapping Screws - #2 Drill Point - Domestic Steel Zinc - Each

The QTEKD6M measures #10 diameter by 3/4 inch overall length, which covers a thin attachment plus the steel it drills into. Rule of thumb for self-drillers: you need at least three threads past the back of the base metal, so 3/4 inch works for mounting straps, clips, boxes and brackets to light-gauge steel but is short for stacking two thick members.

A 5/16 inch hex driver or magnetic nutsetter in a drill or impact. The QTEKD6M uses a 5/16 head with Quadrive drive, which is a hex washer head that also accepts a square (Robertson) bit, so a #2 or #3 square bit will drive it if you cannot get a nutsetter into a tight spot.

The QTEKD6M is domestic steel with zinc plating, which is a dry-interior corrosion coating. Use it indoors for electrical rough-in, strut, stud and box mounting. For exterior, roof, or wet and corrosive locations, specify a stainless or a coated exterior-rated fastener instead.

Yes. The QTEKD6M is produced from domestic steel and is made in the USA, which is what buyers on Buy American or Build America, Buy America jobs need from a fastener line item.

That is the normal use. A #10 x 3/4 inch self-driller with a #2 point and a 5/16 hex washer head drives straight through light-gauge steel stud and track without pre-drilling, and the washer head gives bearing on strap and box flanges. For attaching to wood or into masonry, use a wood screw or an anchor instead; a drill point screw gains nothing there.

QTEKD6M is the Metallics designation for the 10 x 3/4 inch, 5/16 hex head Quadrive self-drilling and tapping screw with a #2 drill point in zinc plated domestic steel. One model covers the whole item, so there is nothing further to specify beyond quantity.