Jam Nut, Nut Style Jam Nut, System of Measurement Inch, Basic Material Steel, Material Grade Grade 5, Fastener Finish Plain, Fastener Thread Direction Right Hand, Dia./Thread Size 7/8 In.-14, Fastener Thread Type UNF (Fine), Width 1.269 to 1.312 in, Wrench Size 1 5/16 in, Nut Height 0.458 in to 0.510 in, Nut Standards ASME B18.2.2