On the left is a M8 flange nut from Pro-Bolt. On the right an equivalent from Hyperbolt.
To my eyes the Pro-Bolt flange nut looks lighter while the Hyperbolt is beefier and cheaper. Is the Pro-Bolt engineered to be lighter or as Bro Mugil puts it "plain cost cutting"? Any comments/thoughts?
Anyway I went with a titanium full nut + washer for the fuel rail. Unfortunately there is no ti spring washer in the size I want.