5/16"-18 x 1" Grade 6/6 Natural Nylon Hex Cap Screw / THREAD CLASS: 2A THREAD DIRECTION: RIGHT-HAND THREAD LENGTH: 1.00 INCHES NOMINAL FASTENER LENGTH: 1.235 INCHES MAXIMUM HEAD STYLE: C1 HEXAGON HEAD HEIGHT: 0.195 INCHES MINIMUM AND 0.235 INCHES MAXIMUM WIDTH BETWEEN FLATS: 0.484 INCHES MINIMUM AND 0.500 INCHES MAXIMUM END ITEM IDENTIFICATION: 01-615-9020 NOMINAL THREAD DIAMETER: 0.3125 INCHES THREAD QUANTITY PER INCH: 18 MATERIAL: PLASTIC POLYAMIDE OVERALL THREAD SERIES DESIGNATOR: UNC