Beyond pissed about my ohlins!
Advanced
Joined: Jun 2012
Posts: 97
Likes: 5
From: Rockwall,TX
Type I Chromic Acid Anodizing will wear off of the threads after a few times of turning the adjusting collar, especially with the load of the suspension against it . Then you will need a wax or lubricant to protect the threads from corrosion .Type I Chromic Acid Anodizing is famous for coming loose and jamming threads and causing problems , it is just too soft of a coating for threads .
Hardcoat Anodizing, often called "Type III anodizing" as denoted by the MIL-A-8625 specification, is an electrochemical process that creates a controlled oxide film on the surface of aluminum. Hardcoat Anodizing utilizes sulfuric acid, low bath temperatures, and high voltage to produce a very high surface hardness (60-70 Rockwell C). Hardcoat Anodizing is generally used for applications that need a corrosion, abrasion, and wear resistant coating. ( copied from Chem Processing , Inc . web site )
The hard coat is what the company I worked for used , After switching to the hard coat we never had problems with threads again.
Chem Processing Inc . They are the people that processed our parts .
http://www.chemprocessing.com/page.a...Acid-Anodizing
Hardcoat Anodizing, often called "Type III anodizing" as denoted by the MIL-A-8625 specification, is an electrochemical process that creates a controlled oxide film on the surface of aluminum. Hardcoat Anodizing utilizes sulfuric acid, low bath temperatures, and high voltage to produce a very high surface hardness (60-70 Rockwell C). Hardcoat Anodizing is generally used for applications that need a corrosion, abrasion, and wear resistant coating. ( copied from Chem Processing , Inc . web site )
The hard coat is what the company I worked for used , After switching to the hard coat we never had problems with threads again.
Chem Processing Inc . They are the people that processed our parts .
http://www.chemprocessing.com/page.a...Acid-Anodizing
Last edited by Darrell07FLHR; Jul 28, 2016 at 08:19 AM. Reason: spelling
Seasoned HDF Member
Joined: Apr 2009
Posts: 44,903
Likes: 29,883
From: PNW
Type I Chromic Acid Anodizing will wear off of the threads after a few times of turning the adjusting collar, especially with the load of the suspension against it . Then you will need a wax or lubricant to protect the threads from corrosion .Type I Chromic Acid Anodizing is famous for coming loose and jamming threads and causing problems , it is just too soft of a coating for threads .
Hardcoat Anodizing, often called "Type III anodizing"
Hardcoat Anodizing, often called "Type III anodizing"
Road Warrior
Joined: Jun 2014
Posts: 1,357
Likes: 91
From: Michigan
Sorry to hear of your misfortune, it is truly unfortunate!
With that being said I wonder if or why there is no cover of sorts over the threads? if they are so susceptible to dirt which may cause irreversible damage why then are the threads not covered? at least a portion above and below the preload adjusting ring.
With that being said I wonder if or why there is no cover of sorts over the threads? if they are so susceptible to dirt which may cause irreversible damage why then are the threads not covered? at least a portion above and below the preload adjusting ring.
Advanced
Joined: Jun 2012
Posts: 97
Likes: 5
From: Rockwall,TX
I do not know what ohlins shocks uses , from the photo in post #16 , there appears to be dark stains on the threads , and that is what corrosion looks like , I also do not see any foreign material such as dirt on those damaged threads , I see what looks like balled up aluminum
and anodizing material . From my experiences and from what I have seen it is easy to have parts with threads anodized , and when they are done being coated and having material build up on the threads , the tolerances on the threads get too tight . It was a long learning curve for us to learn to cut threads very loose so that the build up of coating brought them back into a nice tolerance , we often had to return parts that had to much coating and have them redone so the threads wouldn't jam .
and anodizing material . From my experiences and from what I have seen it is easy to have parts with threads anodized , and when they are done being coated and having material build up on the threads , the tolerances on the threads get too tight . It was a long learning curve for us to learn to cut threads very loose so that the build up of coating brought them back into a nice tolerance , we often had to return parts that had to much coating and have them redone so the threads wouldn't jam .
Last edited by Darrell07FLHR; Jul 28, 2016 at 10:46 AM. Reason: spelling
Outstanding HDF Member
Joined: Jul 2013
Posts: 2,083
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From: Tulsa, OK
It was a whole lot easier to justify a suspension upgrade when I just had to buy one $600 shock for the rear.
I'm not changing anything till it's paid off and warranty is over.
I'm not changing anything till it's paid off and warranty is over.
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Joined: Aug 2011
Posts: 11,814
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From: SW Ohio
Track shoes for a rhinoceros with a weight problem 
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I do not know what ohlins shocks uses , from the photo in post #16 , there appears to be dark stains on the threads , and that is what corrosion looks like , I also do not see any foreign material such as dirt on those damaged threads , I see what looks like balled up aluminum
and anodizing material . From my experiences and from what I have seen it is easy to have parts with threads anodized , and when they are done being coated and having material build up on the threads , the tolerances on the threads get too tight . It was a long learning curve for us to learn to cut threads very loose so that the build up of coating brought them back into a nice tolerance , we often had to return parts that had to much coating and have them redone so the threads wouldn't jam .
and anodizing material . From my experiences and from what I have seen it is easy to have parts with threads anodized , and when they are done being coated and having material build up on the threads , the tolerances on the threads get too tight . It was a long learning curve for us to learn to cut threads very loose so that the build up of coating brought them back into a nice tolerance , we often had to return parts that had to much coating and have them redone so the threads wouldn't jam .