Selection of material and metal fastener selection to minimize galvanic action (corrosion) between fastener and base metal
base metal
fastener material
zinc & galva- nized steel
aluminum & aluminum alloys
steel & cast iron
brass, copper, bronze, monel
martensitic stainless 410
austenitic stainless (302/304)
zinc & galvanized steel
A
B
B
C
C
C
aluminum & aluminum alloys
E
A
B
C
not recommended
B
steel & cast iron
AD
AE
A
C
C
B
terne (lead-tin) plated sheet
ADE
AE
AE
C
C
B
brass, copper, bronze, monel
ADE
AE
AE
A
A
B
ferritic stainless steel (430)
ADE
AE
AE
A
A
A
stainless steel A2 (302/304)
ADE
AE
AE
AE
A
A
A - the corrosion of the base metal is not increased by the fastener B - the corrosion of the base matal is marginally increased by the fastener C - the corrosion of the base metal may be markedly increased by the fastener material D - the plating on the fastener is rapidly consumed, leaving the bare fastener metal E - the corrosion of the fastener is increased by the base metal
Independent test results available upon request. Lumber for these tests is typical of the woods used in post frame construction. All lumber is constructiongrade with the exception of “economy fir” which is unrated. This lumber was not kiln dried. Tighter grain structure would provide a substantial increase in pullout values. Values with 1” penetration can vary from 240 lbs. to 1150 lbs., depending on wood density. We believe these are typical values found in field applications. These values are ultimate with no safety factors. Recommended minimum penetration is 1”, except for plywood.
PL
DE
