Castle Nut, Nut Style Hex Slotted Nut-Regular, System of Measurement Inch, Basic Material Steel, Material Grade Grade 2, Fastener Finish Plain, Fastener Thread Direction Right Hand, Dia./Thread Size 1-3/4 In.-12, Fastener Thread Type UNF (Fine), Width Across Flats 2 5/8 in, Nut Standards ASME B18.2.2