M7 is a non preferred size that only seems to be used on Push Bikes. I doubt you’d get a bolt that long in a bike shop though?
When I designed and built my last Crossbow I tried to standardise on one bolt size wherever possible and settled on M5 as it is strong enough for many fixing jobs without being too large. It’s also available in a large range of sizes. I have M5 cap head socket screws up to 120 mm long.
Last edited by xbow; 30-11-2017 at 04:56 PM.
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