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I seem to remember that Chater crank I mentioned had broken in a similar place to your BSA - it wasn't on the pedal thread, which seems more common with ali cranks.
I've got an ancient BSA fluted crank in use - I will give it a very careful examination.
Very few old steel cranks are getting any serious use these days, so it's hard to know whether breakages would be frequent if they had more use. My policy will be to trust to luck - and careful inspection !
clubman-
@clubman @jeff80 or anyone else ... all that talk of snapping cranks has kept turning over in my mind. Have you had any other components break?
The only one I've had so far is a 70s alloy stem (a good quality JPR), no injury luckily I had the saddle tightly clenched in my butt. It just sheered off at the top of the seattube, I guess maybe slightly the wrong size.
Anyone ever had any issue using period alloy bars? I few years ago I looked in to it more and found a lot of scare stories on the interweb but no first hand accounts of failures. I remember some post or another saying they would fail slowly and bend, but my seatpost snapping doesn't back that up.
veloham
The bsa broke about 2/3rds of the way down, just above the pedal thread. I felt a twisting motionwhen pedaling, got off the bike and it had started to split/tear across the width of the crank. The pair I have on my Paragon now seem solid though...(famous last words!) I forgot, my RRA crank did the exact same. They were famous for breaking though it seems. Maybe I'm doing something wrong...