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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Round heads are domed and look like half of a sphere. One way drive is installed with a flat bladed screw driver but cannot be removed without special tools.
The most common