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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Oval heads are countersunk (cone shaped under the head) with a rounded top. Slotted drive has a simple slot for a flat bladed screw driver.
The most common stainless steel for general hardware use.