B-Line B135HDG Eaton series strut fittings and accessories, 3.5" Height, 3.5" Length, 1.62" Width, .765lbs, Steel, Flat three hole corner gusset plate, Thickness 1/4 in, Hot-dipped galvanized

The B135HDG is hot-dipped galvanized steel, which is the finish used for exterior, damp, and corrosive-environment strut framing. If you are building a rooftop, parking structure, tunnel, or wash-down run, this is the right finish family to match against your galvanized channel and hardware.

The B135HDG measures 3.5 x 3.5 x 1.62 inches. The two 3.5 inch faces are what set the reach along each leg of the corner, so check you have that much clear strut on both sides of the joint before you commit to it. In a congested corner with less than 3.5 inches of run, a smaller two-hole angle fitting is the better call.

Three holes, and it is a flat corner gusset, so the bolt pattern ties both legs of the joint plus the corner itself. The plate is sold as the plate only. You will need to add channel nuts and hex bolts sized to your strut, and to match them in hot-dipped galvanized so the corner does not corrode at the fastener before the plate does.

Order B135HDG. That is the Eaton B-Line manufacturer part number for the 1/4 inch steel flat three hole corner gusset plate in hot-dipped galvanized finish. The HDG suffix is the finish designation, so quoting the full number keeps you from being shipped the plain finish version.

Mechanically yes, the fitting is steel and bolts up the same. Practically, mixing finishes in an exposed run is where the corrosion starts. Hot-dipped galvanized is a heavier coating than electroplated zinc, so pairing it with plated bolts or a painted channel outdoors means the lighter-coated piece fails first. Indoors and dry, mixing is not an issue.