PRODUCT SPECIFICATIONSPart #: 0000-182376Fastener Type: 12-Point Flange ScrewSize Description: 5/16-24 x 1Diameter/Nominal Size: 5/16Length: 1Wrench Size/Across Flats: 0.306-0.315"Head Height: 0.312"Flange Diameter: 0.457-0.469"Flange Thickness: 0.099-0.199"Thread Pitch: 24Thread Pitch Type: FineThread Direction: RightSystem of Measurement: InchGrade: 170 KSI Alloy Steel (Grade 9)Material: Alloy SteelFinish: Thermal Black OxideHead Type: 12-Point with FlangeDrive Type: External 12-PointAverage Piece Weight: 0.0270000 lbs.12-Point flange screws, also known as Ferry Bolts are high-strength fasteners where the flange diameter and head thickness of the 12-Point Flange Screw are equivalent to the head dimensions of a socket head cap screw, thus permitting the 12-Point Flange Screw to be a replacement for any application that calls for a socket head cap screw. The 12-point head design means that this screw can be tightened with a 12-point socket wrench which allows higher torques to be applied as compared to a standard internal hex drive socket head cap screw. The head or wrench size is the same as the body size.