B-Line B261-18GRN Eaton series strut fittings and accessories, 14.43" Height, 18" Length, 1.62" Width, 2.34lbs, Steel, Corner to brace length 14-7/16, Two hole knee brace, 45 deg, Load capacity 450 lbs, DURA GREEN

The B261-18GRN 45 degree knee brace is rated for 450 lbs. That is the figure to design to when you are bracing a cantilevered strut run, a wall-mounted trapeze, or a conduit rack off a column. If your bracket load exceeds it, step up to a heavier brace or add a second brace on the run.

It is an 18 inch brace overall, 14.43 inches high and 1.62 inches wide, with a corner to brace length of 14-7/16 inches. That corner-to-brace figure is the one that matters on layout: it tells you how far down the vertical strut and out along the horizontal the bolt holes land from the corner, so you can check the brace clears whatever is mounted on the run before you drill.

The B261-18GRN is the brace itself, a two hole 45 degree knee brace weighing 2.34 lbs. Channel nuts and hex bolts are ordered separately, and you need two sets, one at each end. Size them to the strut you are bracing.

A corner angle only ties the two pieces of strut together at the joint, so the connection takes the whole moment. A 45 degree knee brace like the B261-18GRN triangulates the corner, picking the load up 14-7/16 inches out from the corner on each leg and carrying up to 450 lbs. Use the brace on cantilevered or wall-mounted racks, anything carrying real weight, or anything that will see vibration. A plain angle is fine only for light, non-structural framing.

DURA GREEN is Eaton B-Line's coated steel finish, used where plain electro-galvanized fittings would corrode too fast. The B261-18GRN is steel with that coating. For matching appearance and corrosion protection across a job, keep the strut, channel nuts and fittings all in the same finish family rather than mixing a green-coated brace onto plain zinc hardware.