SATO RACING Store › Flange Lock Nut M8S [FLNT-8S] Image 1 of 1 Flange Lock Nut M8S [FLNT-8S] $2.50 Stainless steel M8 size Flange Lock Nut (low head) (part# FLNT-8S), for use with specified Sato Racing Rear Sets models. Get notified by email when this item is in stock again. Add To Cart Added! Stainless steel M8 size Flange Lock Nut (low head) (part# FLNT-8S), for use with specified Sato Racing Rear Sets models.