[RE-wrenches] Broken bolt

[Ron Young]

I don’t believe the problem was galling, the bolt was already seated and I was just doing a final torque on it. Tightening wasn’t excessive for the size of the bolt. Looking at the cross section of the bolt it just doesn’t look like it has solidified in the mfg. process. I think oxides were formed from metallic impurities during manufacture or some other related cause.

Ron

> On Oct 2, 2018, at 8:26 AM, Jerry Shafer <jerrysgarage01 at gmail.com> wrote:
> 
> Ron
> It almost looks like the bolt to stud is off center as it might be gauling causing pre-mature torq on the stud that can lead to failure, try grease paste on the threads next time, it might help.
> Jerry
> 
> On Tue, Oct 2, 2018, 1:14 AM Ron Young <solareagle at solareagle.com <mailto:solareagle at solareagle.com>> wrote:
> Anyone seen this before, the bolt on a shunt inside a Magnum inverter snapped right off, other half inside the shunt. I was tightening it but I don’t believe excessively. It appears to be crystallized. Magnum is replacing the shunt but it’s my good luck that the job is 5 hours into a remote backwater along a punishing road.
> 
> 
> 
> Ron Young
> earthRight Solar - Solareagle.com <http://solareagle.com/>_______________________________________________
> List sponsored by Redwood Alliance
> 
> List Address: RE-wrenches at lists.re-wrenches.org <mailto:RE-wrenches at lists.re-wrenches.org>
> 
> Change listserver email address & settings:
> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org <http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org>
> 
> List-Archive: http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html <http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html>
> 
> List rules & etiquette:
> www.re-wrenches.org/etiquette.htm <http://www.re-wrenches.org/etiquette.htm>
> 
> Check out or update participant bios:
> www.members.re-wrenches.org <http://www.members.re-wrenches.org/>
> 
> <IMG_1821.jpeg>_______________________________________________
> List sponsored by Redwood Alliance
> 
> List Address: RE-wrenches at lists.re-wrenches.org
> 
> Change listserver email address & settings:
> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org
> 
> List-Archive: http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html
> 
> List rules & etiquette:
> www.re-wrenches.org/etiquette.htm
> 
> Check out or update participant bios:
> www.members.re-wrenches.org
> 

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.re-wrenches.org/pipermail/re-wrenches_lists.re-wrenches.org/attachments/20181003/434d35c4/attachment.htm>