Phillips Pan Head Screw M2.5X6 Zinc Nickel Alloy

Ultra-Precision Electronic Screws: Engineering Excellence for Micro-Scale Applications Advanced Fastening Solutions for the Technology-Driven World

Phillips Pan Head Screw Main advantages:

MICRO PRECISION - Manufactured using precision CNC machining with micron tolerances (±0.02mm) ensuring a perfect fit on precision electronic components.

PREMIUM MATERIALS - Aerospace grade alloys (Stainless Steel 304, 316L, Aluminum, Titanium Ti-6Al-4V) with anti-corrosion coating and EMI shielding properties.

Vibration Resistance - Patent-pending thread geometry reduces loosening under 50G vibration (MIL-STD-202H certified).

1. Thermal Stability of Conventional Zinc-Nickel Electroplated Screws

• Without additional treatments: Baseline zinc-nickel alloy coating (Zn-Ni 12-15%) remains stable at ≤120°C

  • Failure mechanisms:

    • >150°C: Coating grain structure coarsens, reducing corrosion resistance

    • >200°C: Microcracks form due to CTE mismatch between coating and substrate (e.g., steel, ~30% difference)

• • • 250°C: Coating hardness drops by 40% (from 450 HV to 270 HV)

2. Enhanced Surface Treatments and Thermal Stability Improvements

3. Critical Considerations for High-Temperature Environments

• Material compatibility:

  • Avoid direct contact with aluminum alloys (CTE=23.6); use Invar alloy (CTE=1.6) spacers

• Torque attenuation compensation:

  • Reduce preload by 15% per 100°C rise (per VDI 2230 standard)

• Hydrogen embrittlement risk:

  • Post-plating baking at 200-220°C for 4 hours (to relieve residual stress)

4. Performance Comparison (MAO-Treated Zn-Ni Screws vs. Stainless Steel)

5. Alternative Recommendations

• For >350°C:

  • Inconel 718 with aluminum coating (950°C resistance, high cost)

  • Ceramic screws (Al₂O₃/Si₃N₄, 1600°C resistance but brittle)

• Cost-performance balance:

  • Dual-layer coating: Zn-Ni base + PVD CrN coating (450°C resistance)

  

Ultimate Precision Screws Summary

Surface-treated zinc-nickel alloy screws achieve 120-350°C practical temperature resistance (process-dependent), but they remain medium-temperature solutions. For long-term >300°C or thermal cycling scenarios, advanced material systems are recommended. Would you like further optimization of design parameters?

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