With the potential problems with galling with stainless u-bolts why not use
galvanized? Just curious!
Bob W7KD
----- Original Message -----
From: "Lyle Hornbaker" <lyle.hornbaker@verizon.net>
To: "Tower and HF antenna construction topics." <towertalk@contesting.com>
Sent: Tuesday, April 13, 2010 6:01 AM
Subject: Re: [TowerTalk] dxengineering U-bolts froze??
> Yep. Galling is the term for what you saw. It is most likely to happen in
> stainless steel and really is a function of the material but there are
> ways you can reduce the likelihood of galling. I actually haven't seen it
> in fasteners but I was in the submarine service in the Navy and we had
> stainless steel valves with caps that were prone to galling.
>
> The key is to make sure that you are careful during installation as you
> usually start galling on the installation and only make it worse during
> removal. Don't over torque. Use slower speeds (no high speed impact
> wrenches!). ALWAYS use an anti-seize lubricant. If you continue to have
> problems, choosing fasteners where the bolts and nuts are made of
> different alloys can help. Here is a quick internet site that explains a
> bit more. http://www.estainlesssteel.com/gallingofstainless.html
>
> 73
> Lyle - KI4WKT
>
> From Lat 36.98135 N
> Long -76.63769 W
>
>
>
>
> ________________________________
> From: "Dubovsky, George" <George.Dubovsky@andrew.com>
> To: Tower and HF antenna construction topics. <towertalk@contesting.com>
> Sent: Tue, April 13, 2010 8:45:56 AM
> Subject: Re: [TowerTalk] dxengineering U-bolts froze??
>
> Bob,
>
> It's called "galling" and most stainless alloys are prone to it. It's just
> like the parts weld together. The cure is to always lubricate stainless
> fasteners during assembly. I carry a brush-top can of Never-Seez whenever
> I'm doing tower work, but any light grease will work just fine.
>
> 73,
>
> geo - n4ua
>
> -----Original Message-----
> From: towertalk-bounces@contesting.com
> [mailto:towertalk-bounces@contesting.com] On Behalf Of Bob AD5VJ
> Sent: Tuesday, April 13, 2010 8:38 AM
> To: towertalk@contesting.com
> Subject: [TowerTalk] dxengineering U-bolts froze??
>
> I like dxengineering parts; however, I installed my new th6dx this last
> weekend with the help of the Azle Ham Club here locally. After taking down
> my Hornet Tribander I was disassembling the Hornet from the mounting plate
> that I bought from dxengineering.
>
> I bought it with the recommended stainless steel U-bolt clamps they sell
> when I put the Hornet up. It was up less than a year on the tower. While I
> was loosening a couple of the U-bolt from the mast, the nut holding a
> couple
> of the U-bolts became very hard to take off until I had to place the
> assembly in a vice to get enough torque on my wrench to finally get the
> nut
> off along with using a spray lubricant.
>
> The threads are ruined on the nut and the U-bolt since it seemed to cross
> thread as it came loose for no apparent reason.
>
> I would have hated to have been trying this on top of the tower hanging
> from
> a strap trying to get it apart.
>
> Has anyone else had a problem like this, I remember it wasn't hard to
> tighten when I assembled it as it went on very easily, just taking it off
> was very difficult.
>
> 73,
> Bob AD5VJ
>
>
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