1/4"-20 x 3/8" Phillips Drive Round Head Zinc Finish Steel Machine Screw / THREAD CLASS: 2A THREAD DIRECTION: RIGHT-HAND THREAD LENGTH: 0.375 INCHES NOMINAL FASTENER LENGTH: 0.375 INCHES NOMINAL HEAD STYLE: A28 ROUND HEAD DIAMETER: 0.443 INCHES MINIMUM AND 0.472 INCHES MAXIMUM HEAD HEIGHT: 0.160 INCHES MINIMUM AND 0.175 INCHES MAXIMUM INTERNAL DRIVE STYLE: B1 CROSS RECESS TYPE 1 END ITEM IDENTIFICATION: 4320-01-617-7587 NOMINAL THREAD DIAMETER: 0.250 INCHES THREAD QUANTITY PER INCH: 20 PART NAME ASSIGNED BY CONTROLLING AGENCY: MACHINE SCREW, ROUND HEAD CROSS RECESSED SCREW MATERIAL: STEEL SCREW SURFACE TREATMENT: ZINC THREAD SERIES DESIGNATOR: UNC