Best Fasteners for Aluminum
Aluminum is soft and prone to galvanic corrosion, so the fastener material matters as much as the thread. Match or insulate dissimilar metals.
What to Look For
- Stainless or coated steel: stainless holds up best against aluminum.
- Avoid copper-bearing alloys: brass and copper accelerate aluminum corrosion.
- Self-tapping or self-drilling for thin sheet.
- Use anti-seize or an isolation washer on critical joints.
Top Picks
1. Stainless self-tapping screws Best overall
18-8 or 316 stainless cuts its own thread in aluminum sheet and resists galvanic corrosion better than coated steel.
Check price on Amazon →2. Coated TEK self-drilling screws For speed
Drill-and-drive in one step for fastening aluminum sheet to framing.
Check price on Amazon →3. Aluminum screws For matching metal
Eliminates galvanic corrosion entirely where both parts are aluminum.
Check price on Amazon →What to Avoid
Avoid
- Bare steel — it rusts and accelerates corrosion of the aluminum around it.
- Brass fasteners — the copper content corrodes aluminum.
- Over-tightening — soft aluminum strips easily.
Bottom line: Stainless self-tapping screws are the default for aluminum. Use aluminum fasteners when everything is aluminum, and keep brass and bare steel away.
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