A nut with a built in washer and a nylon insert to prevent loosening. Meets IFI-100/107 (2002)
Grade F nuts are used with Grade 5 fasteners. 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
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