5/16"-18 Zinc Finish Steel with External Tooth Lockwasher K-Lock Nut / THREAD CLASS: 2B THREAD DIRECTION: RIGHT-HAND OVERALL HEIGHT: 0.273 INCHES NOMINAL NUT STYLE: A294 HEXAGON END ITEM IDENTIFICATION: MRAP - M-ATV THREAD SERIES: UNC THREAD QUANTITY PER INCH: 18 NOMINAL THREAD SIZE: 0.312 INCHES PART NAME ASSIGNED BY CONTROLLING AGENCY: KEPS LOCK WITH EXTERNAL TOOTH LOCKWASHER SPECIAL FEATURES: NUT WITH EXTERNAL TOOTH LOCKWASHER MATERIAL: STEEL OVERALL SURFACE TREATMENT: ZINC OVERALL