Apart from a name, an emblem, Codex Raukann and Avernii getting absolutely BTFO on Isstvan, there's pretty much zero concrete lore about any of the Iron Hands Clans right?
Normally I prefer to invent my own headcanon but there doesn't seem to be much point when the Clans are all blank slates.

Any BL books touch on them? Nobody seems to care about IH until the Shattered Legion books.