B-Line B280FLZN Eaton series strut fittings and accessories, 3.5" Height, 8" Length, 3" Width, 3.12lbs, Steel, Rectangular post base, flush to side, Fits channel B22, Electro-plated

It describes where the channel sits on the plate. On the B280FLZN the channel mounts flush against one side of the 8 x 3 inch rectangular base rather than centered on it, so the strut face lines up with the edge of the plate. That matters when you are running a post tight to a wall, a curb, or another piece of equipment and need the strut face, not the plate, to be the reference line. If you need the post centered on the footprint, a centered base is the fitting to specify instead.

The B280FLZN is steel with an electro-plated finish, which is a light zinc coating intended for dry indoor service, mechanical rooms, and covered areas. For rooftops, exterior pads, wash-down areas, or corrosive process environments, specify a hot-dip galvanized or stainless version of the same post base instead.

The fitting measures 8 x 3 x 3.5 inches overall and weighs 3.12 pounds. The 8 by 3 inch dimensions give you the plate footprint to work from when you are spacing anchors on concrete or on a steel deck, and the 3.5 inch figure is the height of the channel-receiving section standing off the plate.

No. The B280FLZN ships as the steel post base only. You supply the concrete anchors or deck fasteners for the plate and the bolts and channel nuts that tie the strut into the base. Size the anchors to the plate holes and the load you are carrying.

Order it as B-Line B280FLZN. That is the Eaton B-Line catalog number and the manufacturer part number: rectangular post base, flush to side, steel, electro-plated, for B22 channel.

The B280FLZN is supplied as a mechanical support fitting with no certification applied to it. Treat it as structural support hardware rather than a listed electrical component, and rely on the raceway or equipment it supports for listing requirements.