What is a Metric Split Cotter Pin?
Metric Split Cotter Pins are designed to be easily inserted into a pre-drilled hole with a split body that can be bent back to secure in place, available in most materials. Our sizes range from- M1 X 16 to M8 X 63.
https://arunfasteners.co.uk/stock-range/split-cotter-pins/metric-split-cotter-pins/