Cap Nut, Nut Style High Crown Flattened Head Cap Nut, System of Measurement Inch, Basic Material Aluminum, Fastener Finish Plain, Fastener Thread Direction Right Hand, Fastener Thread Type UNC (Coarse), Dia./Thread Size 1/2 In.-13, Fastener Thread Depth 1 in, Material Grade 6061, Nut Height 1 7/16 in