Longze Torx Drive Countersunk Head Self-Tapping Screws | ISO 14586 / DIN 7982 | Stainless Steel (SS304 / SS316) & Zinc Plated
Product Title
Longze Torx Drive Countersunk Head Self-Tapping Screws | ISO 14586 / DIN 7982 | Stainless Steel (SS304 / SS316) & Zinc Plated
Product Summary
Longze Torx Drive Countersunk Head Self-Tapping Screws are high-performance fasteners manufactured according to ISO 14586 et DIN 7982 standards, widely used in automotive assembly, window & door
installation, cabinetry, and sheet metal fabrication. Featuring a flat countersunk head with a 6-lobe Torx drive, these Longze Torx Drive Countersunk Head Self-Tapping Screws are designed to cut their own
threads into pre-drilled holes in metal or plastic, providing a flush, high-torque finish that resists cam-out better than traditional Phillips drives.
✔ High Torque Transmission: The Torx (Star) drive allows for significantly higher tightening torque without damaging the screw head or the driver bit.
✔ Flush Surface Integration: The countersunk head design ensures a smooth, aerodynamic finish, making it ideal for visible exterior panels and safety-critical surfaces.
✔ Self-Threading Efficiency: Precision-engineered hardened threads allow the screw to create a secure, vibration-resistant bond in various substrates.
Key Features of Torx Drive Countersunk Head Self-Tapping Screws
Anti-Cam-Out Design – The 6-lobe drive ensures the tool stays centered, preventing the bit from slipping and scratching the workpiece.
Durable Sharp Points – Available in Type C (pointed) or Type F (flat end) to suit different material thicknesses and assembly needs.
Superior Corrosion Resistance – Offered in Zinc Plated for industrial use and Marine Grade SS316 for extreme outdoor or chemical exposure.
Global Standard Compliance – Fully compatible with Metric (ISO/DIN) specifications for high-precision engineering projects.
Technical Specifications
Standards: ISO 14586 / DIN 7982 / JIS B1125
Metric Size Range: ST2.2 to ST9.5
Inch Size Range: #2 to 3/8" (Approximate equivalents)
Material: Case-Hardened Carbon Steel, Stainless Steel (A2 / A4)
Drive Type: Torx (6-Lobe / Star Drive) - T6 to T45
Finish: Zinc Plated (Blue/White/Yellow), Black Oxide, Dacromet, Plain
- Material & Mechanical Properties
Matériel Grade Core Hardness Surface Hardness Application Acier au carbone Case Hardened 270 to 390 HV $\ge 450$ HV Sheet Metal / Automotive Acier inoxydable SS304 (A2) $\ge 215$ HV N/A Outdoor / Food Grade Acier inoxydable SS316 (A4) $\ge 240$ HV N/A Marine / Chemical / Medical
- Standard Dimensions (Metric ISO 14586)
Size (ST) Thread Pitch Head Dia (dk max) Head Height (k max) Torx Drive No. ST3.5 1.3 mm 6.80 mm 2.10 mm T10 ST4.2 1.4 mm 8.10 mm 2.50 mm T20 ST4.8 1.6 mm 9.50 mm 3.00 mm T25 ST5.5 1.8 mm 10.80 mm 3.40 mm T25 / T27
- Surface Treatment
Coating Process Salt Spray Application Zinc Plated Electroplating 72 to 144h General Industrial / Electronics Black Zinc Electroplating 48 to 96h Stage Equipment / Automotive Dacromet Zinc-Flake 1000+h Heavy Duty / Outdoor Energy Passivated Chemical 1000+h Stainless Steel Marine Grade
Applications de Torx Drive Countersunk Head Self-Tapping Screws
Automotive: Securing interior trim panels, dashboard components, and exterior light housings where a flush finish is needed.
Window & Door Systems: Mounting hinges and lock plates into aluminum or uPVC frames.
Electronics & Appliances: Assembly of server racks, control panels, and white goods.
Solar Energy: Installing PV panel mounting clips and framing components.
Furniture: Joining metal brackets to thin-walled metal tubing or composite boards.
Installation & Usage Guidelines
Pre-Drilling: Always drill a pilot hole of the correct diameter based on the material thickness to prevent cracking or screw breakage.
Flush Mounting: Ensure the countersink angle in the material matches the screw (90° for Metric). If the material is too thin to countersink, use a pan head screw instead.
High-Speed Assembly: These screws are ideal for pneumatic or electric drivers. Set the clutch properly to avoid over-tightening and stripping the newly formed threads.
Stainless Steel Warning: When using stainless steel Torx Drive Countersunk Head Self-Tapping Screws in metal, use a lower drive speed to prevent thread galling and heat buildup.
Quality Control & Logistics
ISO 9001 Certified production ensuring perfect star drive geometry and sharp thread profiles.
Drilling Speed Test: Random batch testing to ensure the point penetrates the substrate within the specified time.
Torsional Strength Test: Verification that the screw can withstand the torque required for self-tapping without shearing.
Packaging:
Bulk 25kg Export Cartons
Fumigation-Free Pallets
Custom small-box retail packaging with laser-etched branding available
Q: Why choose Torx over Phillips for self-tapping screws? A: Torx allows for higher torque and better power transfer without "cam-out." This results in less operator fatigue and a much lower defect rate on the assembly line.
Q: Can these screws be used in stainless steel plates? A: Generally, stainless steel self-tapping screws are for use in softer materials like aluminum, plastic, or wood. For hard steel or stainless steel plates, please consult us about our hardened bi-metal or thread-cutting screws.
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