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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Pan heads are slightly rounded with short vertical sides. Square drive is designed to reduce the risk of cam-out (stripping) and allow single-handed installation.
The most common stainless steel for general hardware use.
Heat treated for adequate strength. Zinc plated for moderate corrosion resistance.