Longze Cross Recessed Pan Head Self-Tapping Screws are high-precision industrial fasteners engineered to meet rigorous DIN 7981, ISO 7049, and ASME B18.6.3 standards. Specifically designed for seamless integration into sheet metal assembly, electronic enclosures, and plastic moldings, these screws feature a rounded pan head and a high-efficiency Phillips drive to ensure secure, vibration-resistant connections with a clean, professional aesthetic.
By utilizing advanced case-hardened thread technology, Longze self-tapping screws are capable of cutting precise internal threads into various substrates without deformation. Available in multiple premium materials including Marine Grade SS316 and Zinc Plated Carbon Steel, our fasteners provide the optimal balance of clamping force, corrosion resistance, and installation speed for global engineering and manufacturing applications.
Detailed Parameters
| Compliant Standards | DIN 7981 / ISO 7049 / ASME B18.6.3 / JIS B1115 | Metric Size Range | ST2.2 to ST9.5 |
|---|---|---|---|
| Imperial Size Range | #2 to 3/8" (Equivalent) | Available Point Types | Type C (Pointed) / Type F (Flat) / Type R |
| Material Options | Case-Hardened Carbon Steel, SS304 (A2), SS316 (A4) | Surface Finishes | Zinc Plated, Black Oxide, Nickel Plated, Plain |
| Surface Hardness | $\ge$ 450 HV (Carbon Steel) / N/A (Stainless) | Core Hardness | 270-390 HV (CS) / $\ge$ 210-240 HV (SS) |
| Salt Spray Resistance | 72h to 1000h+ (Depending on Coating) | Drive Type | Cross Recessed (Phillips) |
Key Advantages
Superior Corrosion Protection
From cost-effective Zinc plating to Marine Grade SS316, our screws withstand harsh chemical and outdoor exposures.
Rapid Installation
High-efficiency cross recesses reduce bit slippage and assembly time in both manual and automated lines.
Hardened Thread Tech
Case-hardened threads ensure clean, sharp penetration into materials without thread deformation.
Versatile Clamping
The flat bearing surface of the pan head distributes pressure evenly to prevent pull-through in thin substrates.
Low-Profile Aesthetic
Provides a professional, snag-free finish while maintaining higher torque strength than countersunk options.
Global Standardization
Fully compliant with ISO, DIN, and ASME specifications for seamless global trade and engineering integration.
Product Gallery
Management Platforms
ISO 9001 Quality Control
Rigorous dimensional and thread profile inspections ensure every batch meets international standards.
Torsional Strength Tests
Verification that screws withstand the necessary torque to tap steel plates without failure.
Point Sharpness Analysis
Ensuring rapid penetration for Type C variants to maximize industrial assembly speeds.
Surface Treatment Audit
Salt spray testing to guarantee coating thickness and corrosion resistance levels.
Export Packaging
Bulk 25kg export cartons on fumigation-free pallets for secure international logistics.
Custom Distribution
Retail bagging and labeled small-box options tailored for regional distributors.
Investment Return Comparison
| Feature | Standard Fasteners | Longze Premium Screws | Business Impact |
|---|---|---|---|
| Installation Speed | Average | High Efficiency | Reduced Labor Cost |
| Failure Rate | Moderate | Ultra-Low | Lower Warranty Claims |
| Corrosion Life | Standard | Extended (SS316) | Longer Product Lifecycle |
| Material Fit | Generic | Precision Engineered | Perfect Component Fit |
| Supply Chain | Third-Party | Factory Direct | Optimized Procurement Cost |
Frequently Asked Questions
A Pan Head has a flatter profile and a wider bearing surface compared to a Round Head, making it superior for securing thin materials where a flush finish is not required but high clamping force is essential.
A While they can be removed and reinserted, caution is advised. Repeated use can weaken the threads formed in the substrate, particularly in softer materials like plastic or aluminum.
A Pilot hole selection should be based on material thickness and screw diameter. A hole too small may cause screw breakage, while a hole too large will significantly reduce the holding power.
A Stainless Steel SS316 (A4) is the recommended choice for marine grade applications due to its superior resistance to chlorides and corrosive chemical exposure.
A They are widely used in electronics (chassis panels), home appliances (washing machine housings), automotive interiors, and construction (HVAC flashing).
A Use a perfectly matching Phillips bit (PH1, PH2, or PH3) and implement torque-controlled drivers to ensure the clutch disengages once seated, preventing thread stripping.
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