Metallics JTEKD37 14 x 1-1/4 in. 3/8 Indented Hex Head Self-Drilling & Tapping Screws with Washer - #3 Drill Point - Steel Zinc - Each

A 3/8 inch hex driver. The JTEKD37 has an indented hex washer head measuring 0.367 to 0.375 inches across the flats, 0.409 inches across the corners, with a head height of 0.172 to 0.19 inches. Standard practice is a 3/8 inch magnetic nut setter in a drill or impact driver, no pilot hole needed.

The #3 drill point is the heavier of the common self-drill points and is intended for structural-gauge steel rather than thin sheet. Metallics states a drill time of 2.5 seconds through a 1 mm thick plate for this screw. With a 1-1/4 inch overall length, usable thread depth after the drill point and washer head is limited, so it suits fastening into steel studs, channel, and light structural members rather than thick plate stack-ups.

No. The JTEKD37 is not Buy American compliant and not ARRA compliant, with country of origin listed as multiple. On a federally funded project with domestic sourcing requirements, this part will not qualify and you will need a domestically produced self-drilling screw instead.

No separate hardware. The washer is integral to the head on the JTEKD37, with an outside diameter of 0.480 to 0.520 inches and a washer thickness of 0.030 to 0.050 inches. That bearing surface spreads load over a slightly oversized or slotted hole, which is why this head style gets specified for strut, box, and bracket mounting.

These are zinc plated carbon steel, which is a dry-interior or protected-location finish. Zinc plating handles indoor mechanical rooms, ceiling spaces, and interior stud work fine. For exterior, roof-top, or wash-down areas, step up to a stainless self-drilling screw instead, since plated steel will corrode where it stays wet.

They ship in a jar of 100, and 100 is the order minimum. Jar weight is 1.69 lbs. Other sizes and quantities are available by request.

Not in drive torque. Metallics states minimum torques are the same for stainless and steel self-drill screws, so the choice between them is a corrosion decision, not a strength one. Use the zinc plated JTEKD37 for interior work; move to stainless where moisture or dissimilar metal contact is the concern.

Metallics lists the field application as electrical, plumbing, heating and air conditioning. In practice that means mounting boxes, strut, hangers, duct, and equipment brackets to steel studs or light structural steel without pre-drilling. The 3/8 hex washer head drives fast with an impact and the integral washer seats against a sheet metal flange.