Related Resources: hardware
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
|
|
- The corrosion of the base metal is not increased by the fastener.
- The corrosion of the base metal is marginally increased by the fastener.
- The corrosion of the base metal may be considerably increased by the fastener material.
- The plating on the fastener is rapidly consumed, leaving the bare fastener metal.
- The corrosion of the fastener is increased by the base metal. NOTE: Surface treatment and environment can significantly alter activity.
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