B-Line B115HDG Eaton series strut fittings and accessories, 3.93" Height, 3.75" Length, 1.62" Width, .76lbs, Steel, Pre-assembled fitting, Four hole adjustable corner angle, 90 deg, Thickness 1/4 in, Hot-dipped galvanized

The B115HDG is hot-dipped galvanized steel, which is the finish B-Line uses for outdoor, damp, and corrosive environments. That makes it the right pick for rooftop strut racks, exterior conduit supports, parking structures, and wash-down areas where a plain or electro-galvanized fitting would rust out. Indoors it works fine too, it is simply more coating than a dry interior run needs.

A fixed angle holds one set angle and nothing else. The B115HDG is an adjustable corner angle with a 90 degree base configuration, so the two legs pivot and can be locked off at the angle your run actually needs instead of forcing the strut to square up. Use the adjustable style on sloped roofs, braced knee supports, and pipe racks where the geometry is not a true right angle. If every joint on your job is square and stays square, a fixed 90 degree fitting is simpler and there is nothing to slip.

It ships as a pre-assembled fitting, meaning the two-leg adjustable joint arrives put together so you are not assembling the pivot on a ladder. Plan on ordering your strut nuts, bolts, and washers separately, and match them to the channel you are using. Keep the hardware finish consistent with the hot-dipped galvanized fitting if the assembly is going outside, otherwise the fasteners corrode first.

That is its job. It is an electrical-department strut fitting, a four hole adjustable corner angle used to tie two pieces of channel together at a corner or knee brace on conduit racks, equipment stands, and pipe supports. The 1/4 inch steel body and four bolt holes give you two fasteners per leg, which is what keeps the joint from racking under a cantilevered load.

It measures 3.93 x 3.75 x 1.62 inches (height, length, width as B-Line lists them), at 1/4 inch material thickness. Those numbers matter when you are fitting a corner into a tight ceiling cavity or up against a wall, since the leg length sets how far the fitting projects past the strut end.

Order it as B115HDG from Eaton B-Line. The HDG suffix is the hot-dipped galvanized finish, and that is the only configuration this part comes in, so there is no size or finish choice to specify on the order.