Atkore Allied Tube & Conduit SK100RKON 1" EMT Set Screw Coupling

The SK100RKON is concrete tight when taped. Wrap the joint before the pour so wet concrete can't work its way into the fitting, and it holds up in slab work. Untaped, don't treat it as concrete tight. For wet or damp outdoor locations you want a compression (raintight) fitting instead, not a set screw.

Yes. The screws are pre-set and staked at the factory on the 1/2 inch through 2 inch sizes, which covers the 1 inch SK100RKON. Nothing loose in the box, nothing to thread in on the ladder, just drive them down onto the tubing. The larger 2-1/2 inch through 4 inch fittings in the line use hex head screws instead.

Set screw, like the SK100RKON, is the standard choice for dry interior work, exposed or concealed, and it goes together faster and costs less per fitting. It's also concrete tight once the joint is taped. Compression couplings are what you move to for wet locations, outdoors, or anywhere the inspector is calling for a raintight joint.

Steel, with heavy walls. That matters where the raceway takes abuse, gets stepped on during construction, or has to survive a concrete pour without the body collapsing. Die cast fittings crack under that kind of handling; the SK100RKON body is formed steel.

The 1 inch size uses tri-head screws, the same head found across the 1/2 inch through 2 inch range. A flat blade seats in the slot, and most electricians drive them with a standard screwdriver or a nut driver bit. Step up to 2-1/2 inch and larger and the screws change to hex head.

If your facility is standardized on Atkore Allied Tube & Conduit EMT fittings, SK100RKON is the 1 inch set screw coupling in that line, and it matches the same pre-set tri-head screw pattern used across the 1/2 inch through 2 inch sizes. Ordering by that MPN keeps one screwdriver in the electrician's hand across the whole run of small trade sizes.