Jam Nut, Nut Style Jam Nut, System of Measurement Inch, Basic Material Low Carbon Steel, Material Grade Grade A, Fastener Finish Zinc Plated, Fastener Thread Direction Right Hand, Dia./Thread Size 1-1/8 In.-12, Fastener Thread Type UNF (Fine), Width 1.631 to 1.688 in, Wrench Size 1 11/16 in, Nut Height 0.579 in to 0.639 in, Nut Standards ASME B18.2.2