Metallics JTEKDHH19 10 x 1-1/2 in. 5/16 High Hat Hex Head Self-Drilling & Tapping Screws with Washer - #3 Drill Point - Steel Zinc - Each

It is a bare steel high hat hex washer head, not a bonded or neoprene sealing washer. The integral washer runs 0.364 to 0.414 inch outside diameter, which spreads bearing load and keeps the head from pulling through strap, clip, or thin flange material. For a weather seal on roof or exterior panel work you need a screw with an EPDM bonded washer instead.

Yes, within its range. The JTEKDHH19 is a #10 diameter, 1-1/2 inch long Type BSD self-drilling and tapping screw with 16 threads per inch, so it bites and taps its own thread in the stud or channel without a pilot hole. The 1-1/2 inch length gives you room to pass through a strap and still get full thread engagement in the steel. Torsional strength is 61 lb-in minimum, so do not run it with an impact set on full power or you will twist heads off.

The material is zinc plated carbon steel to AISI 1016-1024. Zinc plating is a mild indoor and protected-location finish. For sustained exterior exposure, wet mechanical rooms, coastal air, or anywhere in contact with treated lumber, specify a stainless or coated exterior screw instead.

It is case hardened to Rockwell C32-40 and built to SAE J78-2013 for self-drilling tapping screws, which is what lets the point cut rather than just spin. That hardness range is matched to the 0.110 to 0.175 inch panel thickness it is rated for, not to heavy structural plate. Hot rolled beam or anything thicker than 0.175 inch needs a drilled and tapped hole with a machine screw or bolt.

The JTEKDHH19 is flagged compliant for both Buy American and ARRA. Country of origin is listed as multiple, so if your specification requires a single documented origin, that is worth pinning down on the submittal.

They ship in a jar, with a 100 count minimum order. Jar weight is 1.05 lbs. Handy for a van stock item since the jar keeps the points from getting knocked around in a gang box.

The high hat profile stands taller, 0.125 to 0.130 inch of head height above the 0.364 to 0.414 inch washer flange, which gives the nut setter more hex to grab and keeps the driver from camming off when you lean into the drill point. A low profile hex washer head sits flatter and is the choice where clearance over the fastener is tight.