5/16"-18 x 1-1/2" Grade 6/6 Natural Nylon Hex Cap Screw / THREAD CLASS: 2A THREAD DIRECTION: RIGHT-HAND THREAD LENGTH: 1.186 INCHES MINIMUM FASTENER LENGTH: 1.186 INCHES NOMINAL HEAD STYLE: C1 HEXAGON HEAD HEIGHT: 0.220 INCHES NOMINAL WIDTH BETWEEN FLATS: 0.500 INCHES NOMINAL END ITEM IDENTIFICATION: VORTAC NOMINAL THREAD DIAMETER: 0.312 INCHES FEATURES PROVIDED: FINISHED HEAD THREAD QUANTITY PER INCH: 18 SPECIAL FEATURES: P/O VOR PLASTIC ANTENNA SHELTER; REFERENCE DATA: DWG, DE-A-2970, ITEM M6 MATERIAL: PLASTIC OVERALL THREAD SERIES DESIGNATOR: UNC