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Sorry Peter, the Izod test is an impact test that breaks the material the Brineell test is the other hardness test but it uses a 3000lb load on a 3/8" ball so not really good for bayonet parts LOL. they do use a lower weight and smaller ball but this is not used as much, Europe went to the Vickers tests for smaller items. I quoted to test the SA80 breach block and it had more indents that my AK47 had parts :-(
Thanks old-smithy. I guess i didn't listen as well as i thought in my engineering science classes in the early 90's. :)
Here are some pictures of a stripped No7 bayonet, on it's own, and in comparison to a No9 blade. The pen tip indicates the extent of the No7 tang end which is longer than that of the No 9 tang by about 5/16" or so. To use a No 9 blade as a replacement blade on a No7 bayonet would have meant a short tang unless extra metal was welded on. An alternative may have been to extend the tang by grinding into the blade but this would obviously shorten the blade. I don't know it either of these courses of action would have been acceptable???
From F/10's comparison photo's (thanks F-10) it looks like you COULD repair a broken/knackered bladed and valuable No7 bayonet by using a decent and readily available No9 blade. BUT only if you grafted/welded on an extension piece to the hilt, drilled and re-rivetted it to the No7 grip area and rear end and then made good. Worth it.....? probably not! Bit of a winter project........? Could be. Old stock No5 cross pieces seem to be available so resurrecting a No7 could be interesting but only if the donor was otherwise complete.
If a "new" unused spare No9 blade was available that still had a long tang, the repair which you describe, Peter, suddenly becomes much more viable. I have never seen spare No9 blade blanks for sale on the surplus market but presumably the blades were available as spares at on time, years ago?
Like Peter suggests though, they look like two different blades actually. I don't think it's really viable...
Thread 35. The actual blade part of any bayonet was never available as a spare part in the military. The only option would be to weld/extend a used No9 blade