External Hex Head Self-Drilling Screw With WasherExternal hex head self-drilling screw with EPDM rubber washer. Available in zinc white and color-coated (gray, brown). Self-drilling tip eliminates pre-drilling. Ideal for metal roofing, cladding, and fence panel installation.MaterialZinc Alloy (Zinc-coated steel)FinishZinc White / Natural Color; Color Coated (Gray, Brown)MOQ5,000 pcsLead time15-30 days (standard); 30-45 days (custom color)Key FeaturesSelf-drilling tip eliminates need for pre-drillingExternal hex head for maximum torque transferIntegrated EPDM rubber washer for weatherproof sealAvailable in zinc white and color-coated finishesSuperior corrosion resistance with zinc alloy materialCE, FDA, and ISO9001 certified20+ years manufacturing experienceOEM/ODM color customization acceptedTechnical SpecificationsSpecificationValueHead TypeExternal Hex HeadDrive TypeHex (External)Point TypeSelf-drilling (TEK)MaterialZinc Alloy (Zinc-coated steel)Surface TreatmentZinc coatColor OptionsZinc white, Gray, Brown (custom available)Washer TypeEPDM Rubber WasherWeight9 g/piecePackage Size33×33×18 cmGross Weight20 kg/cartonPlace of OriginZhejiang, ChinaBrandST (HST)Product DescriptionThe External Hex Head Self-Drilling Screw With Washer is a premium fastener manufactured by HST, a leading fence and gate hardware supplier with over 20 years of export experience. This screw features a self-drilling tip that eliminates the need for pre-drilling, significantly reducing installation time and labor costs. The external hex head design provides excellent torque transfer, while the integrated EPDM rubber washer creates a weatherproof seal that prevents water ingress and ensures long-term durability. Available in zinc white (natural) and color-coated finishes (gray and brown), these screws are suitable for both standard and color-matched installations. With CE, FDA, and ISO9001 certifications, these screws meet international quality standards and are trusted by contractors and builders worldwide. The zinc alloy material provides superior corrosion resistance, making them ideal for outdoor applications in demanding environments.Typical ApplicationsMetal roofing installationSteel cladding and wall panelsFence panel fasteningSteel structure assemblyIndustrial and warehouse facilitiesCommercial building constructionAgricultural buildings and shedsFAQWhat colors are available for the external hex head screw?Standard colors include zinc white (natural) and color-coated options in gray and brown. Custom colors are available for OEM orders. Please contact us with your RAL or Pantone color code for custom color matching.What is the maximum steel thickness this screw can drill through?The self-drilling screw can penetrate steel purlins up to 6mm thick without pre-drilling. For thicker steel, please inquire about our larger TEK screw options.Does the screw come with a rubber washer?Yes, the external hex head screw comes with an integrated EPDM rubber washer that creates a weatherproof seal, preventing water ingress and ensuring long-term durability.What is the minimum order quantity?The MOQ is 5,000 pieces for standard colors. For mixed color orders or custom colors, please contact us to discuss minimum quantities per color.Can you provide samples before bulk order?Yes, samples are available. Please contact us to arrange sample shipment. Sample cost may apply for custom colors.What certifications does the product have?Our factory holds CE, FDA, and ISO9001 certifications. We have been in the fence and gate hardware business for over 20 years with a 100% on-time delivery rate.Request a quote from HST