Metallics SFLN75 Nuts 3/4 Conduit Lock St-zn (Jar 100)

The SFLN75 is a 3/4 inch conduit lock nut, so it threads onto 3/4 inch trade size conduit, fittings, and threaded hubs. Trade size 3/4 is the nominal designation used across EMT, rigid, and IMC threaded connectors, so the nut matches any 3/4 inch male thread on a box connector or nipple.

They ship in a jar of 100, and the jar is the order unit, with a minimum of one jar of 100. There is no loose or smaller count, so a job needing a dozen nuts still buys the full 100 piece jar.

Steel with a zinc finish. The zinc plating gives ordinary indoor and damp-location corrosion resistance, which is what mechanical rooms, basements, and utility spaces typically call for. For direct outdoor exposure, saltwater, or corrosive process areas, a plated steel nut is not the right choice; go to a stainless or non-ferrous nut instead.

Metallics lists the field application for this 3/4 inch lock nut as the electrical, plumbing, heating and air conditioning industries, so it is not restricted to electrical use. The practical limit is the thread: it is sized for 3/4 inch conduit thread, so it mates with 3/4 inch conduit style male threads, not with pipe threads of a different form.

It is a lock nut, not a bushing. It threads over the male conduit or connector thread inside the enclosure and tightens against the box wall to clamp the connection. It has no insulating throat, so where the installation calls for protection of conductors at the raceway end, a separate insulating bushing or an insulated throat connector is still needed.

The 100 piece jar weighs 1.65 lbs and measures 5.75 in by 3.5 in by 3.5 in. Small enough to keep several sizes on a service van shelf without a parts bin.