PRODUCT SPECIFICATIONSPart #: 0000-211261Fastener Type: Machine Screw SEMS Phillips Pan Head External Tooth LockwasherSize Description: #4-40 x 3/8" (FT)Diameter/Nominal Size: #4Length: 3/8"Wrench Size/Across Flats: PH#1Head Diameter: 0.205-0.219"Head Height: 0.070-0.080"Flange Diameter: 0.220-0.230"Flange Thickness: 0.012-0.018"Thread Pitch: 40Thread Pitch Type: CoarseThread Direction: RightThread Coverage: FullSystem of Measurement: InchMaterial: Stainless Steel 18-8Finish: Plain Finish (No Plating)Head Type: PanDrive Type: PhillipsAverage Piece Weight: 0.0013000 lbs.Machine screws have a uniform diameter the entire length of the shaft as opposed to tapered screws which have a pointed tip; are primarily used to fasten machine components, appliances and many more.