[Byron7]

aluminum body .140 dia
steel mandrel.

http://i1372.photobucket.com/albums/ag359/byron7Rv/imagejpg1_zpsb54c06d9.jpg

 

[krw5927]

aluminum body .140 dia
steel mandrel.

Some sort of CherryMax Rivet. Show us the head markings.

At .140 shank diameter, likely a 1st oversize for 1/8" rivet.

If this were a trivia quesiton I'd guess CR3243-4-xx.

 

[Byron7]

http://i1372.photobucket.com/albums/ag359/byron7Rv/imagejpg2_zps3567fac9.jpg

I found a bunch of these and not certain what they are 50 or so. Did not realize oversize rivet was made.
Be a decent rivet for my sub panel to side post connection. Driven ones to look like much fun.

 

[paul mosher]

That is a old cherry, not a max. Need special mandrel for each size. That is why they went to the max.