The depth and width name a family rather than one section: the web and flange thicknesses vary within it, so the mass is what separates them. IS 808 designates these by mass for that reason, and its own footnote to the starred sections says to quote the mass when ordering. Pick the one you mean.
Because the depth and width name a family rather than one section. The web and flange thicknesses vary within it, so MC 300* covers 2 sections weighing 41.5, 46.2 kg per metre. IS 808 designates these by mass for that reason.
Whichever mass your drawing or design calls for — the mass is the part of the designation that identifies the section. Quote it to your supplier along with the size, or you may be sent a different section under the same name.
Its own footnote explains it: the heavier sections of a size are obtained from the same set of rolls as the lighter ones, by spreading the rolls. The standard therefore says the mass should be mentioned when ordering these sections.
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