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Active Contributor

Join Date: Nov 2012
Posts: 22
Good Answers: 1

Please Note 6061 Aluminum is Not Like 7075 Aluminum

06/26/2013 11:59 PM

Hi there,

Aluminum 6061 is much softer than 7075. 6061 aluminum alloy as referral is much easier to machine with CNC, because of its softness, but the chainrings made from aluminum 6061 alloy last orders of magnitude less, than those made from 7075 aluminum, due to the significant difference in hardness.

I am posting this, and hoping you will spread the word, because I'm up to here with dishonest sellers who take my money for a 7075 chainring and send me a replacement which is made of 6061 aluminum alloy as referral, even though I clearly stated that I do NOT WANT a chainring made of aluminum 6061. This particular seller ran out the clock on me, so I could not start a complaint through the PayPal resolution center (45 days max after the transaction), but I still sent an e-mail to PayPal. Sellers thrive on general ignorance. Heck, the in-built obsolescence of chainrings made of aluminum 6061 is a GOOD THING from their point of view, as you will be forced to buy a new chainring much faster than if it were made of aluminum 7075 or better yet, steel.

Jesse

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Guru

Join Date: Oct 2008
Posts: 42355
Good Answers: 1693
#1

Re: Please note 6061 aluminum is NOT like 7075 aluminum

06/27/2013 12:14 AM

I know of no easy way to differentiate between any of the aluminum alloys, by sight.

And, temper, forget it.

How do you know it's 6061, and how do you know if it's T1, T2, T3, etc. etc.

Or, maybe 2024, there are 40 different grades of Al.

So, I suggest you buy steel.

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Guru

Join Date: Feb 2011
Posts: 7025
Good Answers: 207
#2

Re: Please note 6061 aluminum is NOT like 7075 aluminum

06/27/2013 7:36 AM

shoulda just went with Inconel and avoided all the confusion

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