Not Ranked
I'm gonna guess one of the 400-series stainless steels...maybe 416? Heat treating will make it tougher and increase its rust resistance. Can't recall the draw temp for maximum toughness, or the hardness at that point, but I'd guess you'd want it somewhere in the 40's RC.
I wouldn't think there are any dimensionally matched parts here, as any matching would be done by grinding after heat treating and stubs and hubs would be interchangeable. They're all in the same batch because they're all the same material...OR because they're all drawn at the same temp.
Just a guess...
Lowell
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