B-Line B102SS4 Eaton series strut fittings and accessories, 2.25" Height, 3.5" Length, 1.62" Width, 0.56lbs, Steel, Pre-assembled fitting, Three hole corner angle, 90 deg, Stainless steel type 304

Type 304 stainless. The base material is steel with a type 304 stainless steel designation, which is why it carries the SS4 suffix in the part number. That's the version to use on wet, washdown, coastal, or corrosive-atmosphere runs where a plated or painted fitting would rust out at the bolt holes.

Yes. The B102SS4 is the angle bracket itself, supplied as a pre-assembled fitting. Hardware to fasten it to the strut, meaning the channel nuts and hex head bolts, is a separate line item. On a stainless run, match them in type 304 as well, otherwise you get galvanic corrosion at the connection and lose the reason you bought stainless in the first place.

It's a three hole corner angle that joins two runs of strut channel at a 90 degree corner. Three bolt holes total, so it picks up holes on both legs of the joint and holds the angle without a separate gusset. It ships pre-assembled, so the fitting comes ready to bolt into the channel.

A corner angle like the B102SS4 is the piece when two channels meet at 90 degrees on different planes, for instance a vertical post into a horizontal run. It wraps the corner and carries the load across the bend. A flat plate or splice only works when both pieces of channel sit in the same plane. Pick the angle when your joint turns a corner in space, the plate when it doesn't.

B102SS4, from Eaton's B-Line series strut fittings and accessories. Order it by that number; the SS4 ending is what separates the type 304 stainless version from the plated versions of the same three hole 90 degree corner angle.