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Rivet meaning
- Thread starter tracy
- Start date
Googled it 
A" rivets are "soft". They are fabricated from 1100-grade aluminum and have a tensile strength of 16,000 PSI. "AD" rivets are fabricated from 2117 aluminum and heat treated to the T4 condition. They have a shear strength of 26,000 PSI and a tensile strength of 38,000 PSI. Prices below are for 1lb. quantities. Minimum order of 1/8 lb. (use qty .13). All rivets can be purchased in 1/4 lb. (use qty .25) and 1/8 lb. (use qty .13) packages. AN470 (MS20470) AN426 (MS20426).
A" rivets are "soft". They are fabricated from 1100-grade aluminum and have a tensile strength of 16,000 PSI. "AD" rivets are fabricated from 2117 aluminum and heat treated to the T4 condition. They have a shear strength of 26,000 PSI and a tensile strength of 38,000 PSI. Prices below are for 1lb. quantities. Minimum order of 1/8 lb. (use qty .13). All rivets can be purchased in 1/4 lb. (use qty .25) and 1/8 lb. (use qty .13) packages. AN470 (MS20470) AN426 (MS20426).
rmartingt
Well Known Member
Googled it
A" rivets are "soft". They are fabricated from 1100-grade aluminum and have a tensile strength of 16,000 PSI. "AD" rivets are fabricated from 2117 aluminum and heat treated to the T4 condition. They have a shear strength of 26,000 PSI and a tensile strength of 38,000 PSI. Prices below are for 1lb. quantities. Minimum order of 1/8 lb. (use qty .13). All rivets can be purchased in 1/4 lb. (use qty .25) and 1/8 lb. (use qty .13) packages. AN470 (MS20470) AN426 (MS20426).
With respect, I don't think that's what the OP is asking about.
The soft rivets would be AN426A4-6 vs AN426AD4-6
Per the spec (both AN426 and the MS20426 that supersedes it) the second A in MS20426AD4-6A (or as we're used to seeing it,AN426AD4-6A) basically indicates clear anodizing vs. alodining (chromate conversion coating).
Honestly I'd never noticed references to finish codes on these before. The performance is likely interchangeable for our purposes and I suspect that everyone has long been supplying/using anodized rivets instead of the alodined ones out of toxicity concerns anyway (the Type II anodizing is sulfuric acid, not chromic acid).
Last edited:
David Paule
Well Known Member
Also, the "A" rivets have a smooth plain top surface, while the
"AD" rivets have that handy dimple.
Dave
"AD" rivets have that handy dimple.
Dave
Again, that is for the A vs AD (soft vs structural), not the suffix that indicates the finish type.
cvairwerks
Well Known Member
Everyspec.com is your friend for most specifications. AN426 was updated to MS20426. Just for added information, there are 7 different materials and 9 different head stamps for a 426 series rivet. Same for the 470.
Correct
You are correct. I finally got the answer by calling Cessna, who puts out the color code “a”.
You are correct. I finally got the answer by calling Cessna, who puts out the color code “a”.
Bill Boyd
Well Known Member
The -A suffix rivets are non-drilled shank. The ones without the -A are drilled for a teenie-tiny cotter pin. Don't bother with these - takes way too long to finish your build, adds weight, cost, and the tensile strengths are about the same either way.
I was going to hold off posting this until April 1, but figured the thread would be abandoned or someone else would have beat me to it by then anyway.
I was going to hold off posting this until April 1, but figured the thread would be abandoned or someone else would have beat me to it by then anyway.
