Metallics JSS1414SS Screw 1/4-20 x 1/4 SKT S-Scr Cup 18- (Jar 100)

Cup point. The end is a hollow ring with a sharp circular edge that bites into the shaft or part it clamps, which is what you want for a permanent or semi-permanent grip on a round shaft, a collar, or a grounding lug. If you need to clamp something you plan to reposition often, or you don't want the mating surface marked, a flat or nylon-tip set screw is the better choice.

It's a socket (hex key) drive, so it takes an Allen wrench, not a screwdriver or a nut driver. There's no external head, the body is headless and threads fully into the hole, so nothing protrudes to snag a conductor, a belt, or a rotating part.

They're 18-8 stainless, which handles damp indoor locations, exterior boxes, and wet-area enclosures far better than a plain or zinc-plated steel screw. That's the usual reason an electrician specifies stainless for a set screw in a grounding clamp or an outdoor fitting. For direct saltwater exposure, 316 stainless is the step up.

JSS1414SS is the Metallics part number. The JSS prefix is the jar-packed stainless set screw line, and 1414 reads as the 1/4-20 thread and the 1/4 inch length. Quote that number and you get the 100-count jar, not a loose-count or bagged version.

100 pieces per jar. Metallics packs these in a screw-top jar rather than a bag or box, which is the format most electricians keep on the van or in a bin, since it reseals and these screws are small enough to be easy to lose loose in a pouch.