3/4"-10 ASTM A563 Grade A Zinc Finish Steel Jam Nut / THREAD DIRECTION: RIGHT-HAND NUT STYLE: A12 HEXAGON NUT HEIGHT: 0.422 INCHES NOMINAL WIDTH ACROSS FLATS: 0.75 INCHES NOMINAL THREAD SERIES: UNF HARDNESS RATING: 68.0 ROCKWELL B NOMINAL NOMINAL THREAD SIZE: 16.0 INCHES BEARING SURFACE TYPE: FLAT PART NAME ASSIGNED BY CONTROLLING AGENCY: JAM NUT MATERIAL: STEEL OVERALL SURFACE TREATMENT: ZINC OVERALL