FandWay 100 Pcs Hex Head Self Drilling Screws for Metal,M4.8x19mm Self Tapping Sheet Metal Tek Screws,410 Stainless Steel Black Coating Hex Drive With 1 Bits for Steel/Wood/Plastic.

Durable Material: These screws are made from premium 410 stainless steel and Black Dacromet coatings.Passes salt spray tests, Super corrosion resistance offering 5-10x higher corrosion resistance than zinc platingblack oxide.It is very suitable for outdoor and wet conditions.(Tips: 410 Stainless Steel Is A New Type Of Magnetic-Absorbing Stainless Steel so they are also still magnetic.)

Structure & Function : Featuring a drill-shaped tip with cutting grooves or spiral flutes, drill point screws integrate drilling and tapping functions. The self-drilling design eliminates the need for pre-drilling holes, enabling direct penetration into materials like metal sheets, wood, and plastic for rapid installation.

How to choose the size : Match screw length to material thickness: M4.8 screws for 1.75-4.4mm steel plates.Their self-drilling and self-tapping capabilities might be limited when dealing with extremely hard or overly dense materials. It is necessary to assess the material properties beforehand.

Technical Specifications: Surface Hardness: HV450-600 (Vickers Hardness). Core Hardness: HRC 35-45 (Rockwell Hardness), balancing strength and toughness to avoid breakage risks.Torque: Torque & Clamping Force ：The M4.8 accepts 4.0–4.5 Nm, achieving 4.0–5.8 kN, for heavier‑duty fastening requirements.

Wide range of applications: ️ 1- Construction: Fixing color steel plates, aluminum profiles, and light-gauge steel frames.️ 2-Home Improvement: Assembling furniture, wooden frames, and plastic components. 3 - Industrial Manufacturing: Joining thin metal sheets in automotive/mechanical equipment and corrosion-resistant outdoor installations.