#4-7 x 1/4" Round Head Zinc Finish Grade Steel U-Drive Drive Screw / FASTENER LENGTH: 0.220 INCHES MINIMUM AND 0.250 INCHES MAXIMUM HEAD STYLE: C37 ROUND HEAD DIAMETER: 0.193 INCHES MINIMUM AND 0.211 INCHES MAXIMUM HEAD HEIGHT: 0.075 INCHES MINIMUM AND 0.086 INCHES MAXIMUM PILOT DIAMETER: 0.092 INCHES MINIMUM AND 0.096 INCHES MAXIMUM PILOT LENGTH: 0.047 INCHES NOMINAL END ITEM IDENTIFICATION: 4320-01-617-7587 NONMACHINE THREAD STYLE: A16 DRIVE SCREW (TYPE U) NONMACHINE NOMINAL THREAD DIAMETER: 0.112 INCHES PART NAME ASSIGNED BY CONTROLLING AGENCY: METALLIC DRIVE SCREW ROUND HEAD, TYPE "U" MATERIAL: STEEL OVERALL SURFACE TREATMENT: ZINC OVERALL