This spare part is not available for purchase

Hexagon bolt m8x20 GB/T5783-M8X20 can be found as number 21 on the exploded view below

Parsun Hexagon bolt m8x20 GB/T5783-M8X20 is used on the following pages

F4/F5 - cylinder and crankcase 1

F2.6 - cylinder and crankcase 2

F5A/F6A - crankcase

F5A/F6A - engine assembly