A nut with a built in oversize washer which is serrated to resist loosening. Meets IFI-145 (2002) / ASME B18.2.2 (2011).
A low carbon steel for general use. Zinc plated for moderate corrosion resistance.
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Truss heads are wide with a low profile rounded top. Phillips drive is x-shaped for installation with a phillips screw driver.
The most common stainless steel for general hardware use.
A highly corrosion resistant grade of stainless steel. Ideal in salt water and chlorine environments. More expensive than 18-8.