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Create an accountYou'd think these would be a lot easier to find! M5 bolts (metric thread, 5mm) are used to attach accessories to bicycle frames. Some rare frames have a couple eyelets in 6mm, but mostly it's 5mm, and these fit for that. We offer them in a couple of lengths.
We buy these by the thousands from a fastener supplier, and we get the really good A2 stainless steel bolts, so these are strong enough that they can be used for loads from water bottles, to fenders, to bag racks.
Even stainless fasteners should be lightly greased before installation so they don't seize in the threads.
Shipping note: please add these to an order you're placing anyway, because it's a bummer to pay full shipping price just for a few bolts.