Bi-Metal Self-Drilling Screw (Lesson 4)


300 stainless steel–the undefeated champion for screws’ corrosion resistance

Not all stainless steel is created equal. While all offer some degree of corrosion resistance, none matches the protection of 300 series metals. This includes the ever-popular 400 series steels; though suitable for some applications, it is vulnerable to Hydrogen Assisted Stress Corrosion Cracking (HASCC) and can develop harmful rust with prolonged exposure to harsher elements. This jeopardizes the integrity of the screw’s connection by weakening

  • Pull out values
  • Shear strength
  • Tensile strength
  • Ductility

For this reason, DD Fasteners engineered its ultimate self-drilling bi-metal fastening solution using 304 stainless steel, resilient enough to stand up to dissimilar metal connections, pollution, and highly corrosive environments without compromising connection integrity.


Avoid dangerous and costly corrosion-based failures by choosing the right fastener the first time.


The Bi-Metal line features 304 stainless steel screws for a variety of intended uses, including

  •  #10-16 Thread Point 2 – this fastener accommodates light to medium metal attachment, such as with curtain wall or envelope installation. It has a low hex washer suitable for ACM and MCM framing.
  • #12-14 Thread Point 3 – This 304 stainless steel screw offers any of the same benefits as the above-mentioned fastener but with all-around added strength and deeper drilling capacity.
  • #12-14 Thread Point 3 - with Pan Head – similar to the above, this screw also is compatible with light to medium bi-metal connections. However, its pan head style is fitting for projects in which screws are visible.
  • #12-24 Thread Point 5 – this 304 stainless steel screw can self-drill into metal half an inch thick and offer more tensile, shear, and torsional strength than any bimetal fastener we previously mentioned. It comes with a 5/16″ AF hex washer head.
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Post time: Nov-21-2023