So you dropped that bolt you really needed on the gravel and it vanished? Or that fenderset you just acquired only comes with non-stainless hardware?Well we've got your back! As much as a bike shop via the internet can.
We have more sizes and types of bolts than are listed, like button heads and shorter or longer varieties, but these are the most common ones.
All M5 bolts have a head diameter of 8.5mm. Head Height of 5mm. Use a 4mm allan key. 18-8 stainless steel. Bolts up to 25mm long are fully threaded. Bolts over 25mm have 22mm of thread.
All M6 bolts have a full thread to 30mm. Over 30mm, they have 24mm of thread. 10mm head diameter. Head depth 6mm. Drive size: 5mm wrench. 18.8 stainless steel.
Use beeswax to make sure these (or almost any other bolt) don't shake loose.