Metallics JTEKD20M 12 x 3/4 in. 5/16 Indented Hex Head Self-Drilling & Tapping Screws with Washer - #3 Drill Point - Steel Zinc - Each

The JTEKD20M carries an integral steel washer head, 0.398 to 0.432 in. outside diameter and 0.022 to 0.039 in. thick. It spreads clamp load and bridges slightly oversized holes, but it is not a bonded neoprene or EPDM washer, so it does not seal water. For exterior roof or wall panel work where you need a weather seal, use a bonded sealing washer screw instead.

Both the ARRA and Buy American fields on the JTEKD20M are flagged compliant. Country of origin is China, so if your contract requires domestic melt and manufacture rather than trade-agreement compliance, verify which standard your spec actually cites before you submit.

No. The JTEKD20M is a Type BSD self-drilling and tapping screw, so the drill point cuts its own hole and the threads tap it in one pass. Metallics cites a drill time of 2.5 seconds through a 1 mm plate, which tells you to run it at speed with steady pressure rather than impacting it hard, so the point does not burn.

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 drill or impact seats it cleanly. No bit tip required, the drive is hex external.

Zinc plating on the JTEKD20M is a mild corrosion finish meant for dry interior work, electrical enclosures, strut, and framing. For sustained exterior exposure, wet locations, or anywhere near treated lumber or coastal air, step up to a stainless or coated self-drilling screw. Note the torque figures for these screws match stainless self-drill screws, so swapping material does not change your driving setup.

They sell in a 1000 piece minimum, packed in a jar. Shipping weight on that jar is 7.68 lbs.

Dimensions follow ASME B18.6.3-2010 and the thread conforms to SAE J78-2013. Steel is AISI 1016 to 1024, case hardened to Rockwell C32-40 on the core, with a minimum torsional strength of 92 lb-in. That is the data a submittal reviewer usually wants on a Type BSD drill screw.

With an overall 3/4 in. length and 14 threads per inch, the JTEKD20M leaves limited reach once the drill point and the thickness of your top member are accounted for. Against a panel in the 0.110 to 0.210 in. range you get enough thread engagement to tap and hold, but if you are stacking two members or going through a thicker top plate, move to a longer screw in the same series.

Head height on the JTEKD20M runs 0.139 to 0.155 in. That is a low profile for a 5/16 hex washer head, which matters when you are fastening behind a cover plate, inside a panel, or under trim where a tall head would interfere.