PRODUCT SPECIFICATIONSPart #: 0000-114044Fastener Type: Machine Screw Combo (Phillips/Slotted) Truss HeadSize Description: 1/4"-20 x 2 1/2" (FT)Diameter/Nominal Size: 1/4"Length: 2 1/2"Wrench Size/Across Flats: PH#3Head Diameter: 0.546-0.573"Head Height: 0.133-0.150"Thread Pitch: 20Thread Pitch Type: CoarseThread Direction: RightThread Coverage: FullSystem of Measurement: InchMaterial: Low Carbon SteelFinish: Zinc PlatedHead Type: TrussDrive Type: Combo (Phillips / Slotted)Average Piece Weight: 0.0317700 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.