Metallics JTEKD21V 12 x 1-1/2 in. 5/16 Indented Hex Head Self-Drilling & Tapping Screws with Washer - #3 Drill Point - Steel Zinc - Each

The JTEKD21V is a #12 diameter, 1-1/2 in. long screw with 14 threads per inch UNC, case hardened to Rockwell C32-40 and rated at 92 lb-in minimum torsional strength. That is the standard class of fastener for attaching strut, conduit clamps, box brackets and hangers to structural steel inside the 0.110 to 0.210 in. thickness range. Do not exceed the rated torque when driving, or the point can snap off in the hole.

A 5/16 in. hex driver or nut setter. The head is an indented hex washer head measuring 0.305 to 0.312 in. across the flats and 0.34 in. across the corners, with head height of 0.139 to 0.155 in. Run it in a screw gun or impact with a magnetic 5/16 nut setter.

It's an integral washer head, not a separate bonded gasket. The washer face is 0.398 to 0.432 in. outside diameter and 0.022 to 0.039 in. thick, which spreads clamp load over the panel and bears on slotted or oversized holes. If you need a weather seal on an exterior panel, add an EPDM-backed washer separately.

No. The order minimum is 500 count, supplied in a jar. That is the pack this item ships in, so plan the job around full jars rather than loose counts.

These are zinc plated carbon steel (AISI 1016-1024 material), which is a mild corrosion coating meant for dry interior and protected use. For sustained exterior exposure, washdown areas, treated lumber contact or coastal work, specify a stainless or heavier coated self-drilling screw instead.

The JTEKD21V is flagged compliant for both Buy American and ARRA, which is what a government, school or healthcare procurement file usually needs on a fastener line item. Country of origin is listed as multiple.

Threads are built to SAE J78 - 2013 and head dimensions to ASME B18.6.3-2010, with material per AISI 1016-1024. If a submittal or spec section calls out a Type BSD self-drilling and tapping screw to SAE J78, this one answers it. Note SAE J78 carries no specification for #7 diameter drill screws.

No pilot hole. The drill point cuts and the thread taps in one pass, and drill time runs about 2.5 seconds through a 1 mm plate. Use a variable speed gun with a depth-sensitive clutch rather than an impact run wide open, so the point clears chips instead of burning off.

About 6.65 lbs per jar, with the container measuring 7.25 x 4.5 x 4.5 in. Useful if you're staging material by the floor or figuring cart loads on a multi-building MRO order.