Metallics JTEKD12SS 10 x 3/4 in. 5/16 Indented Hex Head Self-Drilling & Tapping Screws with Washer - #3 Drill Point - 410 Stainless Steel - Each

It is a #10 diameter by 3/4 in. long Type BSD self-drilling and tapping screw with 16 threads per inch. Threads follow SAE J78-2013 and head dimensions follow ASME B18.6.3-2010, so it interchanges with any other #10-16 x 3/4 self-drilling hex washer head screw built to those standards.

No. The JTEKD12SS is listed as not Buy American compliant and not ARRA compliant, with country of origin given as multiple. If your project carries a domestic sourcing clause you will need a domestically produced fastener instead.

410 stainless is the material used here, a hardenable martensitic stainless that has to be hard enough to cut its own hole (Rockwell C38-46 on this screw). It resists corrosion far better than plain carbon steel but it is not 300-series stainless, so in continuous wet or coastal exposure expect some surface staining. For damp interior work, strut, duct and mechanical rooms it holds up well.

A 5/16 in. hex driver or nutsetter. The head is an indented hex measuring 0.305 to 0.312 in. across the flats and 0.34 in. across corners, so a standard 5/16 magnetic nutsetter in a screw gun seats it properly. There is no slot or Phillips recess to strip.

Minimum torsional strength on the JTEKD12SS is 61 lb-in. Set your gun clutch below that. Metallics notes minimum torques are the same for stainless and steel self-drill screws, and drill time is about 2.5 seconds through a 1 mm plate, so if the screw is spinning much longer than that you are either in material thicker than its 0.110 to 0.175 in. range or the point is dulled.

No. The drill point does the hole and the thread taps it in the same pass, which is the whole point of a Type BSD screw. One tool, one operation, no pilot and no tapping step. Keep steady pressure so the point bites instead of work-hardening the surface.

Yes, that is the stated field application: electrical, plumbing, heating and air conditioning work. Typical use is fastening straps, clips, brackets and sheet metal to steel studs, strut and duct where you want to drill and fasten in one pass. The 3/4 in. length gives you enough thread past a 0.110 to 0.175 in. panel to get full engagement.

An integral washer is part of the head. Washer outside diameter runs 0.384 to 0.414 in. with a thickness of 0.019 to 0.031 in. That bearing surface spreads load on sheet metal and on strap or clip material so the head does not pull through thin stock. No separate washer to order.

They ship in a jar of 100, and 100 is the order minimum. Jar weight is listed at 0.64 lbs. Other sizes and quantities are available by request.

Head height runs 0.105 to 0.12 in. on the Metallics JTEKD12SS, with the washer adding 0.019 to 0.031 in. of bearing thickness within that profile. It is a low-profile hex washer head, so it sits close to the work where clearance behind a panel or inside a channel is tight.