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• 00:16, 22 August 2025 107.193.59.159 talk performed unknown action "comments/add" on H502 (Alright, I figured it out: Mechanical strength – Pure copper is very soft and malleable. Under repeated tightening, it would deform or strip. Brass (copper + zinc, sometimes with a trace of lead) is much harder and keeps threads intact. That’s important for standoffs which get screwed/unscrewed. Corrosion resistance – Pure copper oxidizes rapidly (green patina). Brass resists tarnish better and maintains good contact over years without needing surface coatings. Machinability – Adding zinc...)