Metallics JSS1412 Screw 1/4-20 x 1/2 SKT S-Scr Cup St- (Jar 100)

The JSS1412 is a 1/4-20 x 1/2 inch socket set screw with a cup point. The 1/4-20 means a 1/4 inch nominal diameter with 20 threads per inch, so it mates with any 1/4-20 tapped hole or coupling, and the 1/2 inch length is the overall screw length since set screws are fully threaded with no head.

Yes, as long as the tapped hole is 1/4-20 and the depth takes a 1/2 inch screw. Thread pitch has to match exactly, so check the existing screw against 1/4-20 before swapping. If the original screw is longer than 1/2 inch it may be reaching deeper into the conductor path and a shorter one will not clamp the same way.

One jar holds 100 screws. Metallics packs the JSS1412 in a jar rather than a box, which is why it is a common bench and service-truck item for electricians replacing set screws in lugs, couplings and connectors.

A cup point has a hollowed, sharp-edged tip that bites into the surface it is tightened against, so it resists loosening under vibration. That is what you want clamping a conductor or a shaft where the mating surface can be marred. A flat point is the one to use when you do not want to damage the part, and a cone point is for permanent location into a drilled or spotted seat. The JSS1412 is the cup point version in 1/4-20 x 1/2 inch.

It is a socket set screw, so it drives with a hex key (Allen wrench) in the internal hex recess, not a screwdriver. There is no external head to grip, which is also why these sit flush or below the surface of a lug or collar when tightened.