#10-24 x 3/8" Zinc Finish Case Hardened Hex Serrated Flange Bolt / THREAD CLASS: 2A FASTENER LENGTH: 0.375 INCHES NOMINAL HEAD STYLE: C1 HEXAGON WIDTH BETWEEN FLATS: 0.28125 INCHES NOMINAL WASHER QUANTITY: 1 INTERNAL DRIVE STYLE: D21 W/O INTERNAL DRIVE END ITEM IDENTIFICATION: 4120016120564 NOMINAL THREAD DIAMETER: 0.189 INCHES THREAD QUANTITY PER INCH: 24 PRIMARY WASHER STYLE: G30 FLAT MATERIAL: STEEL OVERALL THREAD SERIES DESIGNATOR: UNC