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4" EMT Set Screw Coupling
Features
- Pre-set and staked tri-head screws 1/2" thru 2"
- Concrete tight when taped
- Heavy steel walls
- Hex head screws 2 1/2" thru 4"
Manufacturer Resources
Product Specs
- Department:
- Electrical
Allied Tube & Conduit SK400RKON – Frequently Asked Questions
1) What size conduit does the Allied Tube & Conduit SK400RKON coupling join?
It joins 4 inch EMT (electrical metallic tubing), end to end. The part number for that trade size is SK400RKON. It is a set screw coupling, so no threading of the tube is needed, just slide the two EMT ends in and tighten the screws.
2) Can a set screw EMT coupling be used in a concrete pour?
Allied's set screw couplings are concrete tight when taped, so for a slab or wall pour you tape the coupling joint before the pour. Untaped, treat it as a dry indoor connection only. Set screw fittings are not raintight, so wet or outdoor locations call for a compression (raintight) EMT coupling instead.
3) Does the 4 inch EMT set screw coupling use tri-head or hex head screws?
Hex head screws. Allied's set screw couplings run pre-set and staked tri-head screws on the 1/2 inch through 2 inch sizes and switch to hex head screws from 2-1/2 inch through 4 inch, so the SK400RKON at 4 inch takes a hex driver or nut setter rather than a tri-head bit.
4) Should I use a set screw coupling or a compression coupling for 4 inch EMT?
Set screw, like the SK400RKON, is the standard choice for dry interior runs and for concrete when the joint is taped. It installs faster and costs less. Compression couplings are what you want in damp or wet locations, outdoors, or anywhere the inspector is calling for a raintight fitting. Both are for EMT only, not rigid or IMC.
5) Will a 4 inch EMT set screw coupling work on rigid or IMC conduit?
No. It is sized and built for 4 inch EMT only. Rigid metal conduit and IMC have threaded ends and a different outside diameter, so they need threaded couplings or an EMT to rigid combination coupling. Using this on rigid will not seat or ground properly.
6) Is this 4 inch EMT coupling steel or die cast?
Steel, with heavy walls, which is what you want on a 4 inch run where the tubing weight and any pulling force land on the joint. Die cast zinc set screw fittings are common in small trade sizes but not the build here.
How fast can I get the Allied Tube & Conduit SK400RKON delivered?
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Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit,
reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Allied Tube & Conduit SK400RKON come with a warranty?
Absolutely. The Allied Tube & Conduit SK400RKON is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
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