Corrosion Resistance Options

Corrosion Resistance Options

Choosing the right fastener for your application involves more than just size or head type—it also means selecting the appropriate material and coating to ensure long-term corrosion resistance and structural integrity.

1. Material Selection for Corrosion Protection

The primary way to enhance corrosion resistance is by using materials that naturally withstand environmental exposure:

• Carbon Steel (with Coating): Economical and widely used, but requires surface treatments (like zinc plating, ruspert, or ceramic coatings) to delay corrosion. Best for dry or controlled environments.
  
  

• 410 Stainless Steel: A martensitic grade that offers moderate corrosion resistance along with high hardness and strength. Suitable for drilling and tapping into metal. However, it’s less corrosion-resistant than A2 or A4 stainless, and can be prone to hydrogen embrittlement under certain conditions.
  
  

• A2 / A4 Stainless Steel: Austenitic stainless steels (A2 = 304, A4 = 316) provide superior corrosion resistance, especially in outdoor, coastal, or chemical environments. Ideal for long-term durability but not suitable for self-drilling into hard substrates.
  
  

• Bi-Metal Screws: The best of both worlds—combining a 300-series stainless steel body for corrosion resistance with a hardened carbon steel drill point for excellent drilling and tapping performance. This structure avoids hydrogen embrittlement risks while delivering both strength and corrosion durability.
  
  

2. Avoiding Hydrogen Embrittlement

For applications involving high-strength steel, thin coatings, or harsh environments, hydrogen embrittlement is a concern. To mitigate this risk:

• Use stainless steel (A2/A4) where applicable.
  
  

• Consider bi-metal screws for critical load-bearing or exterior drilling applications.
  
  

• Avoid over-plated or brittle coatings on high-hardness carbon steel screws.
  
  

3. Balancing Performance and Protection

When selecting a screw, consider all operating conditions—load, exposure, drilling speed, and expected lifespan. While carbon steel may suffice for interior framing, stainless or bi-metal screws are recommended for high-humidity, chemical, or long-term outdoor installations.

Smart Protection Against Corrosion

Every jobsite faces different environmental challenges. That’s why we offer specialized coatings:

Coating Options:

• RUSPERCOAT®: A multi-layer, eco-friendly barrier that resists rust and hydrogen embrittlement

• Mechanical Galvanized: A durable, zinc-based coating ideal for humid and industrial zones

Features:

• 1000+ hours of salt spray resistance (ASTM B117)

• Smooth surface, no oil residue

• Maintains drilling and tapping performance

• Green, non-chromate process

These coatings are more than surface treatments — they’re essential protection for long-term structural integrity.