Metallics JSS141 Screw 1/4-20 x 1 SKT S-Scr Cup St-Bl (Jar 100)

The JSS141 is a 1/4-20 x 1 inch socket set screw with a cup point, black steel finish. The 1/4-20 means a 1/4 inch diameter shank with 20 threads per inch, which is the standard UNC coarse thread for that diameter, so it mates with any 1/4-20 tapped hole or nut.

Each jar holds 100 of the 1/4-20 x 1 inch cup point socket set screws. Metallics supplies them in a jar pack, which is the usual way these get kept on a service truck or at a bench, rather than loose in a bag.

Cup point is the general purpose choice for exactly that. The hollowed, sharp-edged tip bites into the shaft and resists rotation, which is what you want on collars, sheaves, pulleys and bus or ground connectors. If you need to avoid marring a finished shaft, a flat point or a nylon-tipped screw is the better pick; if you want positive location in a drilled seat, a cone or dog point does that instead. The JSS141 gives you the 1 inch length in 1/4-20.

It's a socket set screw, so it drives with a hex key, not a screwdriver. There is no external head to grip, the screw seats flush or below the surface of the collar or lug.

Order Metallics part number JSS141. That is the single model covering the 1/4-20 x 1 inch cup point black steel socket set screw in the 100 count jar, so there is no finish or length option to pick.

The JSS141 is black steel, the standard black oxide style finish on alloy socket set screws. That finish is for appearance and light corrosion resistance in a dry interior setting, it is not a plated or stainless screw. For wet locations, exterior panels or anywhere washdown is a factor, specify a stainless set screw in the same 1/4-20 x 1 size instead.

Metallics sells the JSS141 as an electrical fastener, which is how it shows up in MRO and electrical stock. Mechanically it is a plain 1/4-20 x 1 inch cup point socket set screw, so it works anywhere that size and point style is called out, electrical or not.