Metallics JTMP22 Screw 1/4-20 x 3/8 Truss PH MS St-Zn (Jar 100)

No. The JTMP22 is a machine screw, so it needs a 1/4-20 tapped hole or a nut behind the work. It will not form its own thread in plain sheet metal the way a self-tapping or sheet metal screw does. If you are fastening into untapped sheet, use a self-drilling or self-tapping screw, or add a 1/4-20 nut or threaded insert.

A truss head is wider and lower than a pan head, so it spreads bearing load over a larger area of thin sheet metal and sits closer to flush. That matters on enclosure covers, plates and knockout blanks where you do not want a tall head catching conductors or a device. The JTMP22 gives you that profile in 1/4-20 x 3/8 with a Phillips drive. If you need the head to clear a recess or sit fully flush, a flat head countersunk screw is the better choice instead.

They are steel with a zinc plating. That is suited to dry indoor and protected locations, panel interiors, enclosure covers and general MRO fastening. For wet locations, exterior work or washdown areas, specify stainless rather than zinc plated steel.

One hundred screws per jar, and the jar is the pack format. That is a shop and truck-stock quantity, handy for an electrical contractor or MRO crib standardizing on one 1/4-20 x 3/8 truss head fastener rather than buying handfuls.

With 3/8 inch of total length under the truss head, your clamped material plus thread engagement has to fit inside that 3/8 inch. In practice it works for thin stacks, sheet steel covers, plates and strap, and runs out of thread fast on anything built up. For deeper assemblies step up to a longer 1/4-20 screw.

Yes, that is its usual job. A 1/4-20 x 3/8 zinc plated steel truss head Phillips screw is standard fare for securing straps, brackets, covers and plates where there is a tapped hole or nut, and the broad head keeps it from pulling through thin stock. Drive it with a #2 or #3 Phillips bit.