Screw spring attachment M8x12 mm, hexagonal, front, bottom

AF 13mm
steel, zinc plated
8.8 Product description
The spring-seats all possess an internal diameter of 10mm and are therefore interchangeable.
One version is made of steel with a bronze sleeve, the other is completely made of bronze.
The design of the lubrication nipples can also differ, with later models having the spring-plate fixed with a screw.
OEM numbers (for comparisons):
S.31114 – 031114 (PIAGGIO)
DIN 933 / ISO 4017 (DIN / ISO Norm)