Metallics JTEKD3M 10 x 3/4 in. 1/4 Indented Hex Head Self-Drilling & Tapping Screws with Washer - #2 Drill Point - Steel Zinc - Each

No pre-drilling and no loose washers. The JTEKD3M is a Type BSD self-drilling and tapping screw, so it drills its own hole and forms its own threads in one pass, and the washer is integral to the head with an outside diameter of 0.384 to 0.414 in. and a thickness of 0.019 to 0.031 in. That washer face spreads the clamp load so you don't dish thin sheet metal.

Yes on both counts, the JTEKD3M is flagged Buy American compliant and ARRA compliant. Country of origin is listed as multiple, so if your spec requires a single named origin on the submittal, that is the one item to pin down with your order.

Three apply to the JTEKD3M: dimensions to ASME B18.6.3-2010, threads to SAE J78-2013, and material to AISI 1016-1024 steel. Case hardness is Rockwell C32-40 with a minimum torsional strength of 61 lb-in. That is the set of numbers an engineer or inspector will ask for on a submittal.

A 1/4 in. hex driver or magnetic nutsetter. The head is an indented hex with hex drive, measuring 0.305 to 0.312 in. across the flats and 0.34 in. across the corners, with a head height of 0.105 to 0.12 in. A standard 1/4 in. magnetic bit holder in an impact or screw gun is what crews run these with.

The JTEKD3M carries a 61 lb-in minimum torsional strength with a case hardness of Rockwell C32-40, which is what lets the point cut without the shank twisting off. Shear-offs on self-drillers almost always come from over-driving after the washer seats, not from the drilling itself, so set your clutch or ease off the trigger once the head bottoms. Drill time is about 2.5 seconds through a 1 mm plate.

They ship in a jar, 1000 pieces to the order minimum. Packed weight for that quantity is 5.4 lbs. If you need a different count or a different length in the same head style, Metallics offers other sizes and quantities in the series by request.

The JTEKD3M is zinc-plated carbon steel, silver in appearance. Zinc plating is a dry-interior and protected-location finish, fine for strut, studs, panel work and indoor duct. For roof deck, exterior canopies, coastal air or chemically washed areas, specify a stainless or coated self-driller instead, since plated steel will bloom rust at the cut threads where the point breaks the plating.

No. The JTEKD3M runs 16 threads per inch in a UNC thread form, which is the self-drilling tapping thread, not machine-screw pitch. A #10-24 or #10-32 nut will not run on it. These are meant to tap their own threads in sheet metal, not to pair with nuts.

For single-layer attachment, yes. At 10 x 3/4 in. the screw has enough length to drill the panel, tap it, and leave at least three threads engaged past the back face in material from 0.035 to 0.110 in. thick. If you are stacking a clamp, a plate and a stud, or going through drywall into steel, you need more length than 3/4 in., so step up to a longer screw in the same head and point style.