1/4"-20 x 2" Zinc Finish ASTM A307 Grade A Round Head Carriage Bolt / THREAD CLASS: 2A FASTENER LENGTH: 2.000 INCHES NOMINAL HEAD STYLE: C37 ROUND HEAD DIAMETER: 0.594 INCHES NOMINAL HEAD HEIGHT: 1.450 INCHES NOMINAL END ITEM IDENTIFICATION: 4120014490459 NOMINAL THREAD DIAMETER: 0.250 INCHES THREAD QUANTITY PER INCH: 20 SPECIAL FEATURES: HEAD STYLE IS ROUND WITH A SQUARE NECK MATERIAL: STEEL CORROSION RESISTING OVERALL SURFACE TREATMENT: ZINC OVERALL THREAD SERIES DESIGNATOR: UNC