1/4"-20 x 3/4" ASTM F593 18-8 Stainless Steel Round Head Carriage Bolt / THREAD CLASS: 2A THREAD DIRECTION: RIGHT-HAND THREAD LENGTH: 0.605 INCHES NOMINAL FASTENER LENGTH: 0.720 INCHES MINIMUM AND 0.770 INCHES MAXIMUM HEAD STYLE: C13 SQUARE HEAD HEIGHT: 0.125 INCHES MINIMUM AND 0.145 INCHES MAXIMUM WIDTH BETWEEN FLATS: 0.563 INCHES MINIMUM AND 0.594 INCHES MAXIMUM END ITEM IDENTIFICATION: 4220-01-617-9405 NECK LENGTH: 0.125 INCHES MINIMUM AND 0.156 INCHES MAXIMUM NOMINAL THREAD DIAMETER: 0.250 INCHES THREAD QUANTITY PER INCH: 20 NECK WIDTH: 0.245 INCHES MINIMUM AND 0.260 INCHES MAXIMUM PART NAME ASSIGNED BY CONTROLLING AGENCY: ROUND HEAD CARRIAGE BOLT MATERIAL: STEEL COMP 302 OVERALL THREAD SERIES DESIGNATOR: UNC