[Milsurplus] Mil Circular Material Questions

[Mike Hanz]

I don't know the specific alloys involved with the castings or knurled nuts, but I believe they are both aluminum alloys, John.  The castings respond well with glass bead blasting...perhaps a gem tumbler would provide the same effect but I would suggest doing only one at a time. The bead blasting is the original finish, and it does present a more reactive surface to moist air, but aluminum has a self-anodizing characteristic over time.

The nut rings appear to be extrusions that are then fully machined, based on their bright original condition.  I use a very fine wire brush on them, followed by immersion in aluminum etching solution available from a professional paint supplier.  Its efficacy depends on the extent of corrosion, but they generally turn out fairly well.

73,
-Mike. KC4TOS 

> On Mar 27, 2014, at 1:12 PM, "J. Forster" <jfor at quikus.com> wrote:
> 
> I have noticed that the Cannon style (Circular, course pitch Acme [square
> thread form] screw) used in several WW II systens, like the ARB, MN-26,
> RA-10, and others tend to corrode more than other connector types.
> 
> This especially applies to the matte finish WWII production, and is less
> of an issue in the bright finish post-war production.
> 
> Does anyone know about the Aluminum alloy used to cast the connector
> bodies? Is it perhaps high in Magnesium which is more reactive and tends
> to rot in moist environments?
> 
> Also, does anyone know of a way of removing light corrosion, preferably
> chemically?
> 
> Thanks,
> 
> -John
> 
> ===============
> 
> ______________________________________________________________
> Milsurplus mailing list
> Home: http://mailman.qth.net/mailman/listinfo/milsurplus
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Milsurplus at mailman.qth.net
> 
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>