You may also like
3-1/2" EMT Set Screw Coupling
Features
- Hex head screws 2 1/2" thru 4"
- Pre-set and staked tri-head screws 1/2" thru 2"
- Heavy steel walls
- Concrete tight when taped
Manufacturer Resources
Product Specs
- Department:
- Electrical
Allied Tube & Conduit SK350RKON – Frequently Asked Questions
1) Will the SK350RKON coupling work on 3-1/2 inch EMT?
Yes. The Allied Tube & Conduit SK350RKON is a set screw coupling sized for 3-1/2 inch EMT, joining two lengths of thin-wall steel tubing end to end. It is a set screw design, so no threading of the conduit is needed, just square-cut, deburred ends pushed in to the shoulder and the screws tightened down.
2) Can I use an EMT set screw coupling in a concrete pour?
The Allied set screw coupling is concrete tight when taped, so it can be used in a slab or concrete pour provided the joint is taped before the pour. Untaped, it is not rated concrete tight. It is also not a raintight or wet-location fitting, so for those runs use a compression (raintight) coupling instead.
3) What kind of screws are on the 3-1/2 inch EMT set screw coupling, and do I need a special driver?
At 3-1/2 inch, the screws are hex head. Allied uses hex head screws across the 2-1/2 inch through 4 inch couplings, so a nut driver or socket handles it. The smaller trade sizes, 1/2 inch through 2 inch, use pre-set and staked tri-head screws instead.
4) Set screw or compression coupling for 3-1/2 inch EMT, which should I order?
Set screw, like the SK350RKON, is the standard choice for dry interior runs, exposed or concealed, and for concrete when the joint is taped. Go to a compression coupling instead where the run is outdoors, in a damp or wet location, or anywhere raintight integrity is required. On large trade sizes the set screw version also goes together faster, since you are only driving hex head screws rather than pulling up gland nuts.
5) What part number do I give my supplier for a 3-1/2 inch EMT set screw coupling from Allied?
Order Atkore Allied Tube & Conduit part number SK350RKON. That is the single catalog number for the 3-1/2 inch EMT set screw coupling, so there is no finish or screw-style option to specify with it.
6) Is the SK350RKON steel or die cast?
Steel, with heavy walls. That matters on a 3-1/2 inch run where the coupling carries real weight between supports, and it is why the body takes hex head screws that can be driven down hard without stripping the housing.
7) Does this EMT coupling come with the set screws installed?
On the 1/2 inch through 2 inch couplings the screws come pre-set and staked in place. The 2-1/2 inch through 4 inch range, which includes the 3-1/2 inch SK350RKON, uses hex head screws supplied with the coupling. Nothing further is needed to make the joint beyond square-cut conduit ends.
How fast can I get the Allied Tube & Conduit SK350RKON delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the
continental
U.S.
Need it urgently? Contact Us for expedited shipping options.
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 SK350RKON come with a warranty?
Absolutely. The Allied Tube & Conduit SK350RKON is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Allied Tube & Conduit SK350RKON?
You can call, text, or email our expert support team for fast answers. We’re here to help with
product
selection,
installation tips, and troubleshooting. Contact Us
Why buy the Allied Tube & Conduit SK350RKON from ZenSupply?
ZenSupply makes it easy to get the commercial door hardware you need—fast shipping, expert support,
and
rewards on
every order.
Our team is always ready to help you choose the right product for your project.