B-Line Eaton series strut channel, nuts, all threaded rod, Steel, Channel nuts, Twirl-nut, Electro-plated zinc, 12 gauge, 450 lbs pull out strength, 4

The TN223ZN channel nut is tapped 5/16"-18, so it accepts 5/16 inch threaded rod or 5/16"-18 bolts. Anything else, a 3/8"-16 rod for instance, will not thread into it.

A twirl nut is a plain channel nut with no spring: you drop it into the channel slot and give it a quarter turn so the grooved ends bite the channel lips. It holds position by that engagement and the bolt tension, so it will drop if you let go before the bolt is started, which makes it awkward overhead. A spring nut carries a captive spring that holds the nut in place at any point in the channel while you thread the rod, and that is the better pick for overhead trapeze and ceiling work. For accessible horizontal runs and bench work the twirl nut like the TN223ZN is the simpler part.

The finish on the TN223ZN is electro-plated zinc, which is a light coating intended for dry indoor use. It is fine in conditioned interiors, electrical rooms and plenums. For exterior, rooftop, coastal or washdown locations, specify a hot dip galvanized or stainless channel nut instead, matched to the same 5/16"-18 thread.

No. The TN223ZN is the channel nut only, steel, tapped 5/16"-18. You order your 5/16 inch threaded rod, bolts, washers and any beam clamps or channel separately.

Yes, that is the normal use. The nut sits in the strut and gives you a 5/16"-18 tapped point for a rod, conduit clamp or strap bolt, at 450 lbs pull out and 450 lbs slip per nut. Keep each connection under that rating and pick the fastener length to suit the clamp stack.

Order Eaton B-Line part TN223ZN. It is a single nut, about .067 lb each, so a box quantity adds up light; count one nut per channel connection point in your takeoff.