5/8"-18 Grade 8 Zinc Finish NE Steel Nylon Insert Lock Nut / THREAD CLASS: 3B THREAD DIRECTION: RIGHT-HAND LOCKING FEATURE: PREVAILING TORQUE WITH NONMETALLIC INSERT NUT STYLE: A12 HEXAGON NUT HEIGHT: 0.766 INCHES NOMINAL END ITEM IDENTIFICATION: MRAP BUFFALO MK2A2 WIDTH ACROSS FLATS: 0.938 INCHES NOMINAL THREAD SERIES: UNC THREAD QUANTITY PER INCH: 18 NOMINAL THREAD SIZE: 0.625 INCHES HOLE CONFIGURATION STYLE: H1 CONFIGURATION A BEARING SURFACE TYPE: FLAT SPECIAL FEATURES: (C93) FIVE TON TANKER TRAILER, MODEL M967A2, 2330-01-495-0040 (C94) FIVE TON TANKER TRAILER, MODEL M969A3, 2330-01-495-0043; HAS NYLON INSERT MATERIAL: STEEL OVERALL SURFACE TREATMENT: ZINC OVERALL