Quote Originally Posted by HoGo View Post
Don't overlook the edge radius of your SHS. I got unpleasantly surprised when I was supplied with 100x100 SHS that has 35mm (or perhaps even more) diameter at edges... I was counting with 25mm diameter I found in tables of SHS somewhere but the supplied steel was cold rolled with much larger edge radius.
That 35mm is very large Diameter and your correct it should be more like 25mm, I have some 200x100x10 here and that is only 22mm Dia. I would have took it back.!!

The Dia on 100 x 100 x 3 will be roughly 8mm, I've got some 150 x 150 x 5 here and the Dia is 12-14mm.