Metallics JSS8316SS Screw 8-32 x 3/16 SKT S-Scr Cup 18-8 (Jar 100)

It's an 8-32 thread screw with a 3/16 inch length, driven with a socket (hex key) and finished with a cup point. The 8-32 designation means a #8 diameter at 32 threads per inch, which is the standard machine screw thread, so it mates with any 8-32 tapped hole or nut.

The material is 18-8 stainless, the common austenitic grade (roughly 18 percent chromium, 8 percent nickel) used for general corrosion resistance. That makes it suitable for damp and outdoor electrical work where a plain steel screw would rust, though 18-8 is not the grade specified for salt-spray marine service.

A cup point has a hollowed, sharp-edged end that bites into the shaft or bus it clamps against, so it resists loosening under vibration. It does mark the mating surface. Choose a flat point instead when the part has to be removed and repositioned without scarring, or when the set screw lands on a hardened surface. The JSS8316SS is the cup point version.

They're sold 100 to a jar. The jar pack is the usual MRO and service-van format for small set screws, so an electrician or maintenance tech gets a resupply quantity rather than a single fastener.

Order Metallics JSS8316SS. That part number covers the 8-32 x 3/16 socket set screw, cup point, in 18-8 stainless, packed 100 per jar.

At 3/16 inch the screw is about as long as it is wide, which suits thin-wall collars, small electrical lugs, and tapped bosses where the screw sits nearly flush and only needs to reach the shaft. If the boss wall is thicker than that, step up to a longer 8-32 set screw so the point actually makes contact.

Yes, a hex key. Socket set screws have no external head, just an internal hex in the end, so they're driven with an Allen wrench rather than a screwdriver or nutdriver. At the #8 size that is a small key, so keep a metric and inch hex set on the truck.