Aluminum Magna-Lok fatigue

[trainguy]

Hi all.

Do any of you use Alcoa-Huck Magna-Lok rivets in aluminum plate? Do you have any issues with blind side loosening because of the bulb shape providing virtually no blind side footprint? Is there a recommended blind side chamfer that could help this?

Plate thickness: 3/16
5083 aluminum
Rivet diameters: 5/16 and 3/8 (mostly due to existing hole sizes and grip lengths)

Any help would be appreciated...

tg

 

[tbuelna]

If you believe what Alcoa states in their technical publications for these rivets, they perform better than other blind rivets when it comes to pin pull-out. Alcoa/Huck products have a solid reputation in the aerospace industry, so I don't think you will have an issue if you follow the design and installation guidelines they provide.

 

[trainguy]

Hi tbuelna,

Are you sure you're not thinking of the Magna-Bulb? That one has more of a flat blind side print and resists pull-out better. For the Magna-Lok, I am concerned with high local stresses right at the blind side hole edge and potential loosening/water-tightness issues. I have never given this a second thought with other Hucks, such as C6L, BOM, or others. The Magna-Lok is more like a heavy-duty pop-rivet, which I have used in steel, but rarely in aluminum.

Are there any other ideas out there for a blind fastener, in aluminum, that leaves a round or truss head on the near side and has a decent blind side footprint?

tg

 

[CoryPad]

You can try Avdel Hemlock or Huck MLS (NAS 1919/1921).

 

[trainguy]

CoryPad,

Great suggestions - these actually work for my application, although they only go up to 0.25 diameter. I now just need to convince my client that aesthetically, the smaller rivet heads (than existing adjacent ones) will be OK.

Thanks!

tg

 

[tbuelna]

trainguy-

No, I was looking at Alcoa-Huck Magna-Loks.