Phillips Flat Head Sheet Metal Screw-Self Drilling Screw for Metal Countersunk Head-Phillips Drive Self Tapping

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1. Performance & Material Properties
   • High-Strength Alloy/Carbon Steel: Machined from quenched-and-tempered C1045 carbon steel or 4140 alloy steel, delivering tensile strengths of 750–850 MPa and Rockwell hardness of 40–48 HRC for exceptional shear and pull-out resistance.
   • Self-Drilling “TEK” Tip: Precision-ground flute hardened to Rc 45–50 drills through 0.5–3.0 mm mild steel or aluminum without pilot holes, evacuating chips efficiently and minimizing heat buildup to protect the substrate.
   • Self-Tapping Thread Form: Rolled threads with a 14° helix form mating threads in sheet metals from 0.8 to 2.5 mm thick, ensuring high clamp load and vibration resistance without additional thread-locking compounds.
   • Flat Phillips Countersunk Head: Ø 8–10 mm low-profile head with a 100° countersink sits flush in sheet material, offering a clean aesthetic and even load distribution across thin substrates.
   • Protective Zinc Plating: Available in trivalent yellow, white or clear zinc with 8–12 µm thickness for ≥240 h salt-spray resistance (ASTM B117), plus optional chromate passivation for enhanced weathering.
2. Detailed Application Range
   • Roofing & Cladding: Securing metal roofing panels, soffits, fascia, gutters, and decorative wall cladding in residential, commercial, and industrial structures.
   • HVAC & Ductwork: Fastening duct seams, plenums, access panels, and grille frames where airtight, corrosion-resistant joints are critical.
   • Electrical & Data Installations: Mounting junction boxes, control cabinets, cable trays, and light fixtures in indoor or sheltered outdoor environments.
   • Light-Gauge Framing & Equipment: Assembling steel stud tracks, purlins, signage, display frames, appliance housings, automotive interior brackets, and machinery guards requiring rapid assembly and dependable performance.
3. Effortless Installation & Operation
   • One-Step Drill & Tap: Integrated self-drilling tip and self-tapping thread eliminate separate pilot-drilling and tapping steps, reducing installation time by up to 50 % and ensuring precise, repeatable hole entry—even on angled or overhead surfaces.
   • Phillips #2 Drive Compatibility: Deep cruciform recess resists cam-out and engages standard #2 Phillips bits or low-torque drivers up to 6 Nm, minimizing bit wear and operator fatigue.
   • Controlled Seating & Anti-Overdrive Shoulder: Built-in head shoulder prevents over-insertion and substrate distortion; screws back out cleanly without enlarging the formed hole, facilitating quick rework or repositioning.
   • Countersunk Flush Finish: Flat head seats flush or slightly proud for a smooth, low-profile appearance and consistent clamp-load distribution.
4. Superior Quality & Long-Term Reliability
   • Standards & Certification: Manufactured in ISO 9001–certified facilities to ANSI B18.6.4 and DIN 7504 P tolerances (±0.1 mm diameter, ±0.2 mm length) for global interchangeability.
   • Rigorous Corrosion & Mechanical Testing: Zinc-plated screws endure ≥240 h salt-spray (ASTM B117) without pitting; each lot undergoes drive-torque verification and head-pull-off testing to ensure consistent performance under vibration and dynamic loads.
   • Full Traceability & Environmental Compliance: Lot-coded from melt to finished part with material certificates, RoHS- and REACH-compliant, free of hexavalent chromium and other restricted substances—providing both regulatory assurance and long-term service life.