Metallics JTEKD37SS 14 x 1-1/4 in. 5/16 Indented Hex Head Self-Drilling & Tapping Screws with Washer - #3 Drill Point - 410 Stainless Steel - Each

The JTEKD37SS is a Type BSD self-drilling and tapping screw with a #3 drill point, so it drills its own hole and cuts its own thread in one pass, no pilot hole. Metallics rates drill time at 2.5 seconds for a 1 mm thick plate. The point and thread are hardened to Rockwell C38-46, which is what lets a 410 stainless screw cut steel rather than just spin.

410 stainless is the martensitic grade used for self-drillers because it can be hardened enough to drill steel, and it gives better corrosion resistance than plain carbon steel for exterior and damp work. It is not the equal of 300 series stainless in salt or chemical exposure. The JTEKD37SS is 410 stainless at Rockwell C38-46 hardness, which is the trade-off: it drills, where a soft 18-8 screw would not.

It ships with an integral washer under the head, outside diameter 0.480 to 0.520 inch and 0.030 to 0.050 inch thick. That spreads the clamp load over sheet metal and resists pull-through. It is a metal washer dimension set, not a bonded EPDM roof washer, so for weather-sealed panel work plan on a separate sealing washer.

It is a #14 diameter screw, 1-1/4 inch long, measured from under the washer to the tip. The #3 drill point and the flutes take up part of the lead, so usable thread engagement is less than the full 1-1/4 inch. For strut, hanger, and panel-to-steel work where the fastener only needs to pick up a single structural member, that is fine; for a deep stack of material step up in length.

Yes. Head and washer dimensions follow ASME B18.6.3-2010 and the threads follow SAE J78 - 2013, which is the self-drilling tapping screw standard. Metallics notes that SAE J78 does not cover #7 diameter drill screws, but #14 like this one is within the standard.

Metallics flags the JTEKD37SS as both ARRA compliant and Buy American compliant, with country of origin China. On a project with a strict domestic-source clause, confirm which standard your specification invokes, because the compliance flag and the origin need to be read together by your compliance officer.

Head height runs 0.172 to 0.19 inch, plus the washer at 0.030 to 0.050 inch under it. So figure roughly a quarter inch of total standoff above the work surface. That rules it out where something has to sit flush over the fastener, and it is why these are used on strut, brackets, and panel laps rather than under trim.

No. Metallics states minimum torques are the same for stainless and steel self-drill screws, so you can set an impact or clutch the same way you would for a plated carbon steel driller. What matters more with the JTEKD37SS is steady pressure until the #3 point breaks through, then easing off so the washer seats without stripping the tapped thread.