1-3/8"-12 Grade C Zinc Finish Steel Collar Style Top Lock Nut / THREAD CLASS: 2B THREAD DIRECTION: RIGHT-HAND NUT STYLE: A12 HEXAGON NUT HEIGHT: 1.138 INCHES MINIMUM AND 1.399 INCHES MAXIMUM END ITEM IDENTIFICATION: 3930015999978 WIDTH ACROSS FLATS: 2.029 INCHES MINIMUM AND 2.065 INCHES MAXIMUM THREAD SERIES: UNF THREAD QUANTITY PER INCH: 12 NOMINAL THREAD SIZE: 1.375 INCHES BEARING SURFACE TYPE: WASHER FACED PART NAME ASSIGNED BY CONTROLLING AGENCY: LOCKNUT COLLAR MATERIAL: STEEL OVERALL SURFACE TREATMENT: ZINC OVERALL