Metallics JTEKD9SS 14 x 3/4 in. 3/8 Indented Hex Head Self-Drilling & Tapping Screws with Washer - #3 Drill Point - 410 Stainless Steel - Each

The JTEKD9SS takes a 3/8 inch hex driver. The indented hex head measures 0.367 to 0.375 inch across the flats and 0.409 inch across the corners, so a standard 3/8 nut setter or magnetic hex driver in a drill or impact driver seats it. No bit tip is needed since the drive is external hex.

No pre-drilling. This is a Type BSD self-drilling and tapping screw with a #3 drill point, so it cuts its own hole and forms its own thread in one pass. Per the product data, drill time runs about 2.5 seconds through a 1 mm thick plate.

No. The JTEKD9SS is not Buy American compliant and is not ARRA compliant, with country of origin listed as multiple. If your contract carries a domestic-sourcing clause, this fastener will not satisfy it.

410 stainless is the material here, which is a hardenable martensitic stainless, the only stainless family that can be heat treated hard enough to drill its own hole. These run Rockwell C38-46. It gives you corrosion resistance well beyond plain carbon steel for exterior strut, rooftop duct, and wet mechanical spaces, though 410 is less corrosion resistant than austenitic 300 series stainless, so for coastal or chemical exposure a 410 drill screw is a compromise rather than a full stainless solution.

The washer is part of the screw, an integral indented hex washer head. Its outside diameter is 0.480 to 0.520 inch with a thickness of 0.030 to 0.050 inch, so you get roughly a half inch bearing surface spreading the clamp load. Nothing extra to buy, and no loose washers to juggle overhead.

Dimensions follow ASME B18.6.3-2010 and the thread conforms to SAE J78-2013, the drill screw thread spec. That matters on a spec job where the submittal calls for a standards-conforming self-drilling fastener. Note that SAE J78 does not cover #7 diameter drill screws, so if your drawing calls out a #7 you are outside that standard.

They ship in a jar, 100 pieces, and 100 is the minimum order quantity. Jar weight is listed at 1.25 lbs. Practical for a service van or a job box rather than a bulk pallet buy.

Metallics lists the application as the electrical, plumbing, heating and air conditioning industries. In practice that means hanging strut and brackets, fastening sheet metal duct and plenum flanges, mounting boxes and enclosures to steel studs or metal, and securing clamps and straps where you want a single-pass fastener with a broad washer head and no pilot hole.

No, and that is worth knowing before you set your clutch. Minimum torques are the same for stainless and steel self-drill screws in this line, so you drive the 410 stainless version at the same settings you would use for carbon steel. With a hardness of Rockwell C38-46, the point is hard enough to cut without backing off driver speed.