There are fastener kits availalbe for some bikes but they are often upgrades to stainless steel or titanium and can be expensive.
I only every carry a few spare fasteners of popular sizes and have rarely needed them, a couple each of M5, M6, M8 and M10 nuts, washers and bolts around 15mm and 30mm long will fix most things by the side of the road or get you to where you can source the correct size.
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