B-Line B159SS4 Eaton series strut fittings and accessories, 3.18" Height, 2.5" Length, 1.62" Width, .56lbs, Steel, Two hole closed angle, 60 deg, Thickness 7/32 in, 9/16 in hole diameter, Stainless steel type 304

Each leg is drilled 9/16 inch, so it takes 1/2 inch hardware, which is the normal pairing for a 9/16 inch strut hole. Order channel nuts and hex bolts separately, two per leg location; the fitting ships as bare hardware with no bolts or nuts included.

It is Type 304 stainless steel, not plated carbon steel. That makes it suitable for exterior runs, wash-down areas, food processing rooms, water treatment plants, and coastal installs where an electro-galvanized or pre-galvanized fitting would rust at the cut edges and bolt holes. For chloride-heavy service, Type 316 is the step up; 304 covers general outdoor and damp interior duty.

Mechanically, yes. The 9/16 inch holes match the standard strut hole pattern, so it bolts up to 1-5/8 inch channel the same way a plated fitting would. The thing to watch is mixing metals: bolting 304 stainless to galvanized channel in a wet or exterior location sets up a galvanic couple at the joint. Indoors and dry it is a non-issue; outdoors, run stainless channel, stainless bolts, and stainless nuts through the whole assembly.

No. This one is a fixed 60 degree closed angle, so the geometry is set the moment you bolt it. If the angle has to be set in the field or adjusted later, you want an adjustable or swivel strut connector instead. Fixed angles like this one are the better choice when the layout is known, because there is no joint to slip once loaded.

Order by manufacturer part number B159SS4, Eaton B-Line series. The SS4 suffix is the Type 304 stainless version; the same base fitting exists in other finishes under different suffixes, so if the drawing specifies stainless, the SS4 designation is the part of the number that matters. It is a single-model item with no options to select.