Metallics JTEKD1M 8 x 1/2 in. 1/4 Indented Hex Head Self-Drilling & Tapping Screws with Washer - #2 Drill Point - Steel Zinc - Each

The JTEKD1M is rated for panel thickness of 0.035 to 0.100 inch. That covers typical light-gauge steel studs, strut, and sheet metal enclosures. Go thicker than 0.100 inch and the #2 drill point will burn up before it penetrates, so step to a heavier drill point screw for structural steel.

At 1/2 inch overall length with a #2 drill point, the JTEKD1M is sized for fastening thin material directly to light-gauge steel in the 0.035 to 0.100 inch range. Once the point drills through and the threads tap, there is enough remaining shank for a single sheet plus a strap or box ear. If you're stacking thicker material or shimming, move up to a longer #8 drill screw so the threads still reach past the drill flutes.

A 1/4 inch hex socket or nut setter. The head measures 0.244 to 0.250 inch across the flats and 0.272 across the corners, with a head height of 0.096 to 0.110 inch. Standard magnetic 1/4 inch nut driver in a screwgun handles it.

Yes, it's an integral hex washer head. The washer outside diameter runs 0.322 to 0.348 inch with a thickness of 0.019 to 0.031 inch, so it spreads bearing on thin sheet and bridges slightly oversized holes without needing a separate washer.

These are carbon steel with a zinc plating, which is an indoor and protected-location finish. Zinc plate gives light corrosion protection for interior enclosures, strut, and stud work, but for exterior, coastal, or wash-down areas you want a stainless or coated exterior-rated drill screw instead.

It's a #8 diameter at 18 threads per inch, UNC form, made to SAE J78 - 2013 for the thread and ASME B18.6.3-2010 for dimensions. The screw taps its own mating thread as it drills, and #8-18 is the standard self-drill thread that will re-engage an existing #8 drill screw hole.

They're flagged as both Buy American compliant and ARRA compliant in the manufacturer's data, which is what a public-works or federally funded spec usually asks for. Country of origin is listed as multiple, so if your spec requires a single named origin on the submittal, confirm the lot origin at order.

Minimum torsional strength is 42 lb-in, with case hardness at Rockwell C32-40. That's plenty for a screwgun set to a light clutch, but it also means over-driving with an impact will twist the head off. Back the clutch down once the washer seats.

They ship in a jar of 1,000, and 1,000 is the order minimum. The jar comes in at 3.22 lbs.