Metallics JSS241 Screw 10-24 x 1 SKT S-Scr Cup St-Blk (Jar 100)

The JSS241 is a 10-24 x 1 inch socket set screw with a cup point. The 10-24 is a standard UNC machine screw thread, so it threads into any 10-24 tapped hole or coupling, and the 1 inch length is the full shank (set screws have no head to subtract). Finish is black steel.

Each jar holds 100 of the 10-24 x 1 inch cup point set screws. It ships as a jar pack, which is the usual way these get kept on a service van or at a bench, rather than loose or carded.

A cup point, like the one on the JSS241, bites into the surface of a shaft, rod or conductor and leaves a small ring-shaped indentation, which is what gives it holding power without needing a machined seat. Flat points are the choice when you do not want to mar the mating part or when the screw gets reset often, and cone points are for a permanent location in a drilled spot. For electrical work, clamping a conductor or securing a rod in a coupling, cup point is the normal spec.

It is a socket set screw, so it drives with a hex key (Allen wrench) in the internal socket, not a screwdriver. There is no external head, which lets the screw seat flush or below the surface of the part it is threaded into.

These are plain black steel, not galvanized or stainless, so they are intended for dry interior use. In damp, exterior or corrosive conditions, specify a stainless or zinc plated set screw of the same 10-24 x 1 inch size instead.

It is sold as an electrical fastener, and a 10-24 cup point socket set screw is the size and style commonly used as a replacement screw in clamps, couplings and ground connectors. Measure the thread in your existing part first, since 8-32, 1/4-20 and 5/16-18 set screws are also common in that hardware and the thread must match exactly.