Metallics JSS14112 Screw 1/4-20 x 1-1/2 SKT S-Scr Cup S (Jar 100)

It fits any connector body tapped 1/4-20, and the 1-1/2 inch length suits deeper connector bodies where a short screw would not reach the conductor. Measure the tapped depth of your lug first: a 1-1/2 inch screw is long for shallow mechanical lugs, where it will bottom out or stick past the far side. Metallics catalogues this screw in its electrical fastener line, so the sizing is aimed at that kind of work.

A hex key. The JSS14112 is a socket drive set screw, so it is driven by an internal hex (Allen) wrench, not a flat or Phillips driver. The head is headless, meaning the screw seats fully inside the tapped hole and nothing protrudes to catch.

Each jar holds 100 pieces. The jar pack is the typical shop or service-truck quantity for set screws, so one unit covers a run of connector or collar work without reordering mid-job.

Cup point, which is what the JSS14112 is, is the general-purpose choice for electrical and mechanical holding work: the ring-shaped edge digs slightly into the shaft or conductor and resists loosening under vibration. Choose a flat point instead when you cannot mar the mating surface or when the part will be removed and repositioned often, and a cone point when you want maximum holding in a permanent setup with a pre-drilled spot.