Metallics JTEKD19SS 10 x 1-1/2 in. 5/16 Indented Hex Head Self-Drilling & Tapping Screws with Washer - #3 Drill Point - 410 Stainless Steel - Each

It ships with an integral washer under the head measuring 0.384 to 0.414 inch outside diameter and 0.019 to 0.031 inch thick. That is a metal washer face for bearing area and load spread, not an EPDM sealing washer, so for weather-tight roof or wall panel penetrations you need a screw with a bonded neoprene washer instead.

It is 410 stainless steel, a hardenable martensitic grade, heat treated to Rockwell C38-46 so the point is hard enough to drill its own hole. 410 gives corrosion resistance well beyond plated carbon steel, which is why it gets used on exterior panel and strut work, but it is not 300 series stainless and will show surface rust in salt spray or coastal exposure.

16 threads per inch, UNC, which is exactly the 10-16 self-drilling callout contractors see on panel and strut drawings. Threads conform to SAE J78-2013 and head dimensions to ASME B18.6.3-2010, so it drops into specs written to either standard.

Minimum torsional strength on the JTEKD19SS is 61 lb-in, and minimum drive torque is the same for stainless and carbon steel self-drillers of this size, so it is not a weaker screw on the gun. Keep the gun at moderate speed and steady pressure, let the point cut, and back off once the washer seats. Typical drill time is about 2.5 seconds through a 1 mm plate.

Both flags are marked compliant, ARRA and Buy American, which is what a federal, school district, or municipal submittal package usually asks for on fasteners. Country of origin is listed as multiple, so if your contract requires a single named origin on the cert, that is the detail to pin down on the mill paperwork.

They come in a jar of 100, and 100 count is the order minimum, so the smallest buy is one jar. The jar weighs 1.02 lbs. Other sizes and quantities in the JTEKD series are available by request.

Type BSD identifies a self-drilling and tapping screw with a drill point that bores its own hole and cuts its own thread in one operation, no pilot hole and no separate tap. On the JTEKD19SS that point is a #3 size, and the screw is classed as a drill point type under SAE J78-2013 threading.

Head height runs 0.105 to 0.12 inch, plus the washer at 0.019 to 0.031 inch, so you are looking at roughly an eighth to a sixth of an inch of standoff above the panel face. That matters if something has to lay flat over the fastener, in which case a low profile or flat head screw is the right call.