Serrated Flange Nut
3/8" UNF Thread x 9/16" Socket (Single)

These Hex Nuts With Flanged Co llars Are Available Especially For Carburettor, Valve Cover, Front Cover, Oil Pan Studs An d Windage Tray Studs. Made Fro m Premium Quality Material The y Are Or Cad Plated. All Gener al Purpose Nuts Are Rated 150, 000psi Tensile Strength.