3/8"-16 Grade C Zinc Finish Steel Top Lock Nut / THREAD DIRECTION: RIGHT-HAND LOCKING FEATURE: PREVAILING TORQUE ALL METAL DESIGN END ITEM IDENTIFICATION: MRAP - COMMON NSN - USED ON MRAP NO PERMANENT WSDC IDENTIFIED AND 19 OTHER WEAPON SYSTEMS THREAD SERIES: UNC THREAD QUANTITY PER INCH: 16 NOMINAL THREAD SIZE: 0.375 INCHES MATERIAL: STEEL OVERALL SURFACE TREATMENT: ZINC OVERALL