3/8"-16 Grade C Zinc Finish Steel Top Lock Nut / THREAD CLASS: 2B THREAD DIRECTION: RIGHT-HAND LOCKING FEATURE: TOP LOCK LUBRICATION: WAX NUT STYLE: A12 HEXAGON NUT HEIGHT: 0.320 INCHES MINIMUM AND 0.415 INCHES MAXIMUM END ITEM IDENTIFICATION: MRAP - UNIQUE NSN - MRAP NO PERMANENT WSDC IDENTIFIED WIDTH ACROSS FLATS: 0.551 INCHES MINIMUM AND 0.565 INCHES MAXIMUM THREAD SERIES: UNC THREAD QUANTITY PER INCH: 16 NOMINAL THREAD SIZE: 0.375 INCHES BEARING SURFACE TYPE: FLAT PART NAME ASSIGNED BY CONTROLLING AGENCY: NUT,HEX,SELF-LOCKING MATERIAL: STEEL OVERALL SURFACE TREATMENT: ZINC OVERALL SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: ASTMF1941 ASSN STD ALL TREATMENT RESPONSES OVERALL