B-Line Eaton series strut fittings and accessories, .23" Height, 3.5" Length, 1.62" Width, .37lbs, Steel, Two hole splice plate, Thickness 1/4 ", Hot-

The B129HDG is hot-dipped galvanized steel, which is the finish B-Line uses for outdoor, damp, and corrosive-environment strut runs. That covers rooftop mechanical supports, parking structures, wash-down areas, and exterior wall-mounted racks. For dry indoor work you would normally spec the electro-galvanized version instead; the hot-dip coating is thicker and heavier, which is exactly why it costs more and lasts longer outside.

A two hole plate is the light-duty splice in the family. It is 1/4 inch thick steel, which gives it real stiffness, but with only two fasteners it is meant for continuing a run where the joint is close to a support or carrying modest load. If the splice lands mid-span or the run carries significant weight, step up to a four hole or six hole splice plate so the joint has more fasteners sharing the shear.

No. The B129HDG ships as the plate only, .37 lb of hot-dipped galvanized steel with two holes. You need to order channel nuts and hex bolts separately, and for an outdoor run you should match them in hot-dipped galvanized or stainless so you are not pairing a galvanized plate with plain-finish hardware that rusts first.

Material thickness is 1/4 inch, and the overall stated height of the part is .23 inches, so it sits essentially flat against the strut face with no formed offset. Budget that 1/4 inch of added stack when you size bolt length through the channel nut, and check clearance if the strut face is tight against a wall or another member.

Order B129HDG. The HDG suffix is the hot-dipped galvanized finish; the same plate geometry exists in other finishes under different suffixes, so quoting the bare number without HDG can get you an indoor-finish part delivered to an exterior job.