Metallics SPT820 Screws 10-24 x 3/4 Ov Tr Span Switch SS (100)

A spanner (two-hole) drive is used, and the 100-count pack of SPT820 screws ships with the 00SP6B spanner insert bit, so you do not have to buy the driver separately. The insert bit fits a standard 1/4 inch hex bit holder or drill, which is how most techs run it.

Yes. The SPT820 is a 10-24 machine thread at 24 threads per inch, which is the standard thread used on device mounting ears and switch/receptacle plate holes in North America, so it replaces the factory 6-32 cover screw only where the plate and device are tapped 10-24. If your device yoke is tapped 6-32 (the usual size for receptacle and switch mounting screws), you need the 6-32 tamper screw instead.

The screws are 18-8 stainless steel, which is the common austenitic grade used for corrosion resistance in damp interior and exterior-protected locations. That also means they will not rust-stain a stainless or painted cover plate the way a plated steel screw can.

The spanner head cannot be backed out with a screwdriver, nut driver, or Torx bit, so cover plates stay on in corridors, restrooms, holding areas, dorms and other public spaces where plates get picked at. Metallics lists the SPT820 for electrical, plumbing, heating and air conditioning work, and it is the standard answer for institutional MRO standardizing on one tamper screw across a facility.

Metallics flags the SPT820 as both ARRA compliant and Buy American compliant, which is what a public-works or federally funded submittal usually asks for on fasteners. Country of origin is listed as multiple.

At 3/4 inch, the SPT820 is longer than the typical 1/2 inch cover screw, which gives you thread engagement through a standard plate plus a mud ring or a plate set slightly off the box. If you are stacking a thick weatherproof cover or a spacer and run out of thread, Metallics offers other lengths and quantities in the same tamper-resistant spanner line by request.

They come 100 to a clamshell pack, sold by the count, and the pack weighs 0.61 lbs with the carded dimensions running 3.75 x 2.75 x 1.5 inches. The 00SP6B spanner bit is in the same pack.

Metallics specs the head as pan type, so it seats on the face of the plate rather than countersinking into it. On a flat plastic or stainless plate the head sits slightly proud, which is normal for a surface-mount tamper screw; if you need a flush look you want a countersunk oval or flat head plate screw instead.