Continental Exhaust Flange Self-Locking Nut

Nut - 1/4-28 Thread, Self-Locking Nut, 800°,, Reduced Hexagon, Reduced Height, Corrosion & Heat Resistant Steel, Silver Plated. Used extensively in the IO-360, O-470, IO-520, and IO-550 series. Used for attaching exhaust manifolds to cylinders because its silver plating and corrosion-resistant steel (CRES) construction prevent seizing at high temperatures (up to 800°F).