B-Line Eaton series strut electrical accessories, 6.25" height, 1.65" length, 1.62" width, Steel, 2pc 1/4 -20 flat head screw 2pc N224WO channel nut,

Hardware is included. The B619ZN ships with two 1/4-20 flat head screws and two N224WO channel nuts, so you can bolt it to the strut without buying fasteners separately. Note the flat head screws pair with the fitting's countersunk holes, so substituting a hex head changes how it seats.

It is 16 gauge steel with an electro-plated zinc finish. Zinc plating is an indoor, dry-location finish: it handles normal interior mechanical room, ceiling and wall conditions, but for exterior, wash-down or corrosive environments you want a hot-dip galvanized or stainless strut fitting instead.

The bracket is punched with 1/2 inch and 9/32 inch holes. The 9/32 holes take the supplied 1/4-20 screws into the channel nuts; the 1/2 inch opening gives you a larger pass-through for rod, conduit or a bigger bolt where the run calls for it.

The included N224WO channel nuts are 1/4-20 strut nuts, and 1/4-20 is one of the standard strut nut threads used across 1-5/8 inch channel from the major strut makers. Physically they drop into standard 1-5/8 inch channel of any brand; what varies between brands is the nut's spring and groove detail, not the bolt thread. Match the channel width first.

No agency certification applies to this fitting; it is catalogued as Not Applicable for certifications. It is a mechanical steel strut fitting, not an electrically rated device, so on a spec job it gets approved on the strut system and the engineer's load detail rather than on a listing mark.

Order by manufacturer part number B619ZN from Eaton's B-Line series. The ZN suffix is the electro-plated zinc version; if a run ever needs a different finish for corrosion, that is a different part number, not a variation of this one.