What is purpose of end hinges that is mounted on 4 section garage doors? This one is from a Pella garage door and mounts on side above where the rollers are mounted. The door uses 6 of these. -3 on each side of the door. 
Purpose of end hinge on garage door
garage-doorhinges
Related Solutions
Barrel Hinge:
But note that there's nothing intrinsically wrong with fitting a completely different type of hinge.
You obviously need hinges explicitly intended for outdoor use. Not like these
If it's 5mm in diameter, it's a common shelf pin / shelf support.
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Best Answer
They connect the sections together so the entire door moves when opening or closing it.
3 on each side means each except the bottom one is connected to the one below.