Flat countersunk screw is suitable for power, aerospace, office equipment, petrochemical, electronics, communications, shipbuilding industry, machinery, etc. You can also see them in construction, manufacturing, engineering, assembling, landlord, repairmen, and other DIY projects.SpecificationColor: SilverMaterial: 304 Stainless Steel (18-8)Thread Size: M4 x 20mmInner Hex Dia: 2.5 mm / 0.1 inchOutside Diameter: 8 mm / 0.31 inchPitch: 0.7 mm / 0.03 inchLength: 20 mm / 0.79 inchThickness: 2.6 mm / 0.1 inchStrength Level: 6.8 GradePacking List: 50 Pcs x Flat Head Socket Cap ScrewsAdvantage1. Hex drive machine screws are made of 304 stainless steel 18-8 with surface polishing, durable, rust-proof, wear-resistant, good strength, superior to regular steel, and offer a high level of chemical and corrosion resistance.2.
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