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Fastener Material Galvanic Compatibility Table Chart

ANSI Hardware Design Guide
Corrosion Galvanic Compatibility Design Data

The following chart defines bolt installation materials galvanic corrosion compatibility.

 
Fastener material selection
based on the Galvanic Series of Metals
Fastener Metal
Zinc &
Galvanized Steel
Aluminum &
Aluminum Alloys
Steel &
Cast Iron
Brasses, Copper,
Bronzes & Monel
Martensitic Stainless
Type 410
Austenitic Stainless
Type 302/304, 303, 305

Base Metal

Zinc &
Galvanized Steel
1
2
2
3
3
3
Aluminum &
Aluminum Alloys
1
1
2
3
Never
2
Steel &
Cast Iron
1,4
1
1
3
3
2
Terne (lead-tin)
Plated Steel Sheets
1,4,5
1,5
1,5
3
3
2
Brasses, Copper,
Bronzes & Monel
1,4,5
1,5
1,5
1
1
2
Ferritic Stainless Steel
(type 430)
1,4,5
1,5
1,5
1
1
1
austenitic Stainless Steel
(type 302/304)
1,4,5
1,5
1,5
1,5
1
1
  1. The corrosion of the base metal is not increased by the fastener.
  2. The corrosion of the base metal is marginally increased by the fastener.
  3. The corrosion of the base metal may be considerably increased by the fastener material.
  4. The plating on the fastener is rapidly consumed, leaving the bare fastener metal.
  5. The corrosion of the fastener is increased by the base metal. NOTE: Surface treatment and environment can significantly alter activity.

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