Longze Torx Drive Countersunk Head Self-Tapping Screws are professional-grade industrial fasteners engineered to ISO 14586 and DIN 7982 standards. Specifically designed for high-torque applications in automotive assembly, cabinetry, and sheet metal fabrication, these screws feature a precision 6-lobe Torx drive that eliminates cam-out and ensures a secure, flush finish on critical surfaces.
Available in high-grade Stainless Steel (SS304/SS316) and Zinc Plated carbon steel, these self-threading fasteners are optimized for efficiency. They allow for rapid installation into pre-drilled holes in both metal and plastic substrates, providing superior vibration resistance and structural integrity for demanding engineering environments.
Detailed Parameters
| Compliance Standards | ISO 14586 / DIN 7982 / JIS B1125 | Metric Size Range | ST2.2 to ST9.5 |
|---|---|---|---|
| Inch Size Range | #2 to 3/8" (Approximate) | Drive Type | Torx (6-Lobe / Star) T6 to T45 |
| Available Materials | Case-Hardened Carbon Steel, SS304 (A2), SS316 (A4) | Surface Finishes | Zinc Plated, Black Oxide, Dacromet, Plain |
| Head Design | Flat Countersunk (90° Metric) | Point Types | Type C (Pointed) or Type F (Flat End) |
| Hardness (Carbon) | Core: 270-390 HV | Surface: ≥ 450 HV | Salt Spray Resistance | 72h to 1000h+ (Depending on Coating) |
Key Advantages
Anti-Cam-Out Design
The 6-lobe Torx drive prevents bit slippage, protecting the workpiece from scratches and reducing operator fatigue.
Rapid Installation
Precision-engineered self-threading points allow for fast, secure bonding in various substrates with minimal effort.
Flush Surface Integration
Countersunk heads provide an aerodynamic, smooth finish ideal for visible exterior panels and safety-critical areas.
Superior Torque Transfer
Designed for higher tightening torque than Phillips drives, ensuring a vibration-resistant and stable connection.
Extreme Corrosion Resistance
Marine-grade SS316 and Dacromet coatings ensure longevity in chemical, marine, and outdoor environments.
Global Standardized Fit
Full compatibility with Metric (ISO/DIN) specifications ensures seamless integration into global engineering projects.
Product Gallery
Management Platforms
Quality Certification
ISO 9001 certified production ensuring perfect star drive geometry and sharp thread profiles.
Penetration Testing
Random batch drilling speed tests to verify the point penetrates substrates within specifications.
Torsional Strength
Rigorous verification that screws withstand self-tapping torque without shearing.
Export Packaging
Standard 25kg bulk export cartons on fumigation-free pallets for secure global logistics.
Custom Branding
Available custom small-box retail packaging with laser-etched branding for distributors.
Technical Support
Expert guidance on pilot hole diameters and torque settings for different material thicknesses.
Material Performance Comparison
| Material Grade | Surface Hardness | Best Application |
|---|---|---|
| Carbon Steel | ≥ 450 HV | Sheet Metal / Automotive |
| Stainless SS304 | ≥ 215 HV | Outdoor / Food Grade |
| Stainless SS316 | ≥ 240 HV | Marine / Chemical / Medical |
| Zinc Plated | 72-144h Salt Spray | General Industrial / Electronics |
| Dacromet | 1000h+ Salt Spray | Heavy Duty / Energy Sector |
Frequently Asked Questions
Torx drives provide significantly higher torque transfer and eliminate "cam-out," reducing driver bit wear and preventing damage to the screw head during high-speed assembly.
Standard self-tapping screws are for softer materials. For hard stainless steel plates, we recommend our specialized hardened bi-metal or thread-cutting screws. Please contact us for technical advice.
Type C features a pointed end for easier penetration into thinner materials, while Type F has a flat end suitable for specific assembly needs and thicknesses.
To prevent galling and heat buildup, use a lower drive speed and ensure the pilot hole is correctly sized according to the material thickness.
For photovoltaic brackets and outdoor energy applications, we recommend Dacromet or Stainless Steel SS316 due to their exceptional 1000h+ salt spray resistance.
Yes, for optimal performance and to prevent material cracking or screw breakage, a pilot hole of the correct diameter should always be drilled first.
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