Metallics JTEKD82 8 x 2 in. 1/4 Indented Hex Head Self-Drilling & Tapping Screws with Washer - #2 Drill Point - Steel Zinc - Each

The JTEKD82 is built to ASME B18.6.3-2010 dimensionally and SAE J78-2013 for threads, with case material in the AISI 1016-1024 range, hardness of Rockwell C32-40, and 42 lb-in minimum torsional strength. Note it is listed as not Buy American compliant and not ARRA compliant, with multiple country of origin, which matters on federally funded work.

At 2 inches of length with 18 threads per inch, the JTEKD82 gives you plenty of reach for standoff work, hanger straps, or stacking material before the point reaches steel in the 0.035 to 0.100 inch range. Keep in mind a drill screw only taps the metal it finally hits, so the gripped material in between is held by the washer head, not by thread engagement.

A 1/4 inch hex driver. The head is an indented hex washer head measuring 0.244 to 0.250 inch across the flats, 0.272 across the corners, and 0.096 to 0.11 inch high. A standard 1/4 inch magnetic nut setter in a screw gun is all that is required, no bit changes.

It spreads load. The integral washer measures 0.322 to 0.348 inch outside diameter and 0.019 to 0.031 inch thick, which gives bearing surface against sheet metal, strap and slotted channel so the head does not pull through. There is no bonded gasket, so for exterior or weather-exposed work you would need a separate sealing washer.

The JTEKD82 is steel with a zinc finish, which is a mild indoor corrosion coating. It is fine for interior electrical, plumbing and HVAC work, including typical mechanical rooms. For roof curbs, exterior duct, coastal exposure or wet process areas, specify stainless self-drilling screws instead, since zinc plating will eventually bloom and rust.

No. The #2 drill point cuts its own hole and taps the thread in one pass, which is the whole point of a Type BSD self-drilling and tapping screw. Run it at steady pressure with a screw gun; on 1 mm plate drill time is about 2.5 seconds.

They ship in a jar of 100 with a 100 piece minimum, so the smallest purchase is one jar. Each jar runs 0.96 lbs. Useful if you are stocking a van or a maintenance shop rather than buying loose pieces.