Should I be concerned about metallurgical compatibility?

You should always be concerned about metallurgical compatibility. Incompatibility can cause rapid galvanic corrosion and void material warranties. S-5! aluminum clamps are completely compatible with painted or unpainted G-90 galvanized steel, bare or painted Aluminized, Galvalume, Zincalume, ZincalumePlus, Acrylume Galvalume Plus, Galfan, Bonderized and Galvanneal steel. They are also compatible with aluminum (painted, bare, or anodized), titanium-zinc (VM & Rheinzink), and with stainless steel. The brass clamp S-5-B is compatible with everything the aluminum clamp is not (copper and its alloys).

If you have concerns or questions regarding clamp compatibility with your roofing material please reach out to us at

MCA Fastener Compatibility Chart/Tech Bulletin