5/16"-18 x 3/4" Zinc Finish Case Hardened Hex Serrated Flange Bolt / THREAD CLASS: 2A THREAD DIRECTION: RIGHT-HAND THREAD LENGTH: 0.720 INCHES MINIMUM AND 0.770 INCHES MAXIMUM FASTENER LENGTH: 0.720 INCHES MINIMUM AND 0.770 INCHES MAXIMUM HEAD STYLE: C1 HEXAGON HEAD HEIGHT: 0.274 INCHES MINIMUM AND 0.298 INCHES MAXIMUM WIDTH BETWEEN FLATS: 0.491 INCHES MINIMUM AND 0.500 INCHES MAXIMUM SHOULDER DIAMETER: 0.666 INCHES MINIMUM AND 0.706 INCHES MAXIMUM END ITEM IDENTIFICATION: 3825-01-577-2713 DISTRIBUTOR, WATER, TANK TYPE NOMINAL THREAD DIAMETER: 0.313 INCHES THREAD QUANTITY PER INCH: 18 MINIMUM TENSILE STRENGTH: 120000 POUNDS PER SQUARE INCH SHOULDER SHAPE: ROUND OVERALL PART NAME ASSIGNED BY CONTROLLING AGENCY: CASE HARDENED ZINC FLANGE BOLT MATERIAL: STEEL OVERALL SURFACE TREATMENT: ZINC OVERALL SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: ASTM F1941, FE/ZN 3A ASSN STD SINGLE TREATMENT RESPONSE OVERALL THREAD SERIES DESIGNATOR: UNC