https://stainlessdepot.com/products/hairpin-style-cotter-pin-fits-1-4-5-16-shaft
Hairpin Style Cotter Pin fits 1/4" - 5/16" Shaft – Jacob Schmidt & Son
18-8 STAINLESS STEEL. Wire Diameter = .0585. Length = 1-1/8"
cotter pinhairpinstylefitsshaft
https://partsmasterusa.com/product/pin-hairpin-cotter-1136828/
PIN HAIRPIN COTTER (1136828) – PartsMaster Inc
hairpin cotterinc