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Generally known as a shimano crank arm bolt I think. the originals are plastic, but ebay has a range of alu ones. https://www.ebay.co.uk/b/shimano-crank-bolt/bn_7024943602
The sizing is odd - they come in 15,18 and 20mm flavours, so you need to do some measuring to work out what will work for your cranks.
Caution - I had some ali-express knock off shimano like mountain bike cranks that apparently use a strange bolt between the 18 and 20mm options. i bought both, but neither fit and the only way is apparently asking an ali-express seller to send you one. My cranks have just gone deep into the parts bin instead.
Scrabble
frank9755
I rode mine yesterday for the first time in a while and, after 15 minutes, the LH crank came loose.
This has happened once before, last year. I've had the bike for 10 years this month so that's not too bad, but a bit annoying.
I had a multi-tool so could get it back on and it stayed on all day but need to sort it out so it doesn't happen again.
The chainset is a no-namer, silver, external bearings, with two opposing bolts on the LH crank like a Shimano Hollowtech. I think I must have lost the equivalent of the Shimano plastic tensioning screw, as there is just a hole where it would be and it doesn't look right. I'd like to replace whatever went there, especially if it helps me get the crank at the right tightness.
I did a search of this thread and got a couple of references to cranks falling off so seems like a thing, but didn't get the answer: so anyone know what the chainset is and what the bit that I seem to have lost looks like?