Where do you find them in metric?
McMaster lists M8x1.25 bronze hex nuts at 2 weeks lead time and over $1 each.
Can’t even find another source.
5/16-18 wouldn’t quite fit, the diameter is really close, but thread is a
little coarser, would need more like 5/16-20.
From: Bill Prince
Sent: Saturday, June 20, 2015 11:10 AM
To: af@afmug.com
Subject: Re: [AFMUG] Gtek Communications deploys PMP 450
We just replace the nut. Nothing wrong with stainless bolts as long as you
don't use stainless nuts on them. Most of the ones you need can be gotten at
McMaster Carr. I'll use either HDG or silicon bronze depending on the size.
bp
<part15sbs{at}gmail{dot}com>
On 6/19/2015 8:51 PM, Brandon Yuchasz wrote:
We can get by with just zinc plated in our environment I suppose but again
replace just the nut or both the nut and the bolt?
Best regards,
Brandon Yuchasz
GogebicRange.net
www.gogebicrange.net
From: Af [mailto:af-boun...@afmug.com] On Behalf Of Ken Hohhof
Sent: Friday, June 19, 2015 10:19 PM
To: af@afmug.com
Subject: Re: [AFMUG] Gtek Communications deploys PMP 450
So where can you buy a galvanized M8x1.25 nut? In any case, I would think
you would have to replace both because galvanized nuts are usually tapped
oversize to accommodate the extra thickness of the galvanizing on the bolts.
I was able to find a bronze hex nut, it doesn’t specifically say silicon
bronze:
http://www.mcmaster.com/#91776a102/=xp6t4f
Would it be so bad to just use a zinc plated nut? Otherwise, replace both
the nut and bolt with galvanized 5/16”. A 13mm wrench might still work.
The other thing I’m wondering is whether you could get away with using some
kind of grease on the threads instead of actual anti-seize. Something you have
anyway like dielectric grease or O-ring grease. Otherwise, I think the nickel
anti-seize is what you’re supposed to use with stainless steel:
http://www.oreillyauto.com/site/c/detail/PER0/77124/N0490.oap
From: Brandon Yuchasz
Sent: Friday, June 19, 2015 9:49 PM
To: af@afmug.com
Subject: Re: [AFMUG] Gtek Communications deploys PMP 450
Okay so clarify for me. Are you guys leaving the stainless steel bolt in
place and just using a none stainless steel nut ( galvanized for example) to
avoid the seizing problem? Let say for example on a force 110 dish. Or are you
replacing both the bolt and the nut with galvanized.
I am asking since I have had this on the force 110 dishes and also just had
three stainless U-bolt clams seize today when removing some older antennas from
a tower site. We had to cut them off.
Best regards,
Brandon Yuchasz
GogebicRange.net
www.gogebicrange.net
From: Af [mailto:af-boun...@afmug.com] On Behalf Of Ken Hohhof
Sent: Friday, June 19, 2015 7:28 PM
To: af@afmug.com
Subject: Re: [AFMUG] Gtek Communications deploys PMP 450
The worst had to be the special axle-like bolt on the first version 430
sectors, I think those were made by PCTel? If you cranked the nuts down even
moderately hard to keep it from slipping, it would snap. I don’t think seizing
was even the problem, it looked like the inside of the bolt was crystalline and
just asking to break when you torqued it. And it was not something you could
buy at the hardware store or McMaster, and Motorola support was absolutely
unhelpful about getting a replacement, I ended up having to MacGyver something.
From: George Skorup
Sent: Friday, June 19, 2015 7:13 PM
To: af@afmug.com
Subject: Re: [AFMUG] Gtek Communications deploys PMP 450
Oh, sorry, forgot to mention that. Yes, I'm talking about the long mounting
bolts and nuts. Haven't had a problem with the short hex head bolts that mate
the mounts to the antenna itself. Except you really need to crank down on
those. I tightened them to what I thought was good, but then I could still give
them a slight push or pull and they moved. So I'm trying to tell the guys to
make sure those are really nice and snug, but try not to wrench too tight on
the mast clamp nuts. They did that.. and they still seized.
On 6/19/2015 7:04 PM, Ken Hohhof wrote:
OK, on the 450 sectors, my recollection is the elevation adjustments are
short hex head bolts that go into threaded inserts. If those are seizing on
people, I think I will just apply anti-seize goop (the good stuff with nickel
dust in it) to them before assembly since I do that on the ground and there’s
no need to touch the threads afterward.
The ones that clamp it to the pipe are wiz nuts on long threaded bolts,
those would be harder to use anti-seize on, and would be the best candidates to
swap out for bronze nuts.
From: George Skorup
Sent: Friday, June 19, 2015 6:13 PM
To: af@afmug.com
Subject: Re: [AFMUG] Gtek Communications deploys PMP 450
Yup, same here. Had to peak out a Force110 link and couldn't break the
elevation nut loose, so we had to leave it a few dB off instead of breaking it
off completely and/or bending the mounting plate.
On 6/19/2015 5:56 PM, Mathew Howard wrote:
I've had several of the SS nuts seize on the ePMP Force110's... which
appear to be the exact same nuts as on the slightly-less-than-half a ton 3.65
sector I just put up.
I would very much like to see Cambium switch to a different kind of nuts.
On Fri, Jun 19, 2015 at 5:05 PM, Ken Hohhof <af...@kwisp.com> wrote:
Have you actually experienced the SS nuts seizing? Maybe I’ve been
lucky, but I have not had trouble with that even after years. I guess I should
be putting anti-seize compound on them, but it’s so messy.
Metric silicon bronze nuts look to be expensive, like in the $1 each
range, to swap them out yourself. Which of the many nuts would you want to be
silicon bronze? Just the 4 that hold it to the pipe? Or also all the ones
involved in the elevation adjustment?
From: George Skorup
Sent: Friday, June 19, 2015 4:42 PM
To: af@afmug.com
Subject: Re: [AFMUG] Gtek Communications deploys PMP 450
I've pulled two up the tower by hand at once and the tower guys didn't
complain, so they can't be that heavy.
What I really wish Cambium would do, or talk Laird into doing, is
replacing the nuts with silicon-bronze like LMG uses on their stuff. Or just go
to galvanized. The stainless on stainless sucks. They're $500 antennas and I
shouldn't have to go buy extra shit for them.
On 6/19/2015 3:45 PM, Josh Luthman wrote:
I bet it's less than half a ton...don't be so dramatic =P
Josh Luthman
Office: 937-552-2340
Direct: 937-552-2343
1100 Wayne St
Suite 1337
Troy, OH 45373
On Fri, Jun 19, 2015 at 4:44 PM, Matt <matt.mailingli...@gmail.com>
wrote:
> 3GHz and 5GHz I've only used the Cambium/Laird sectors. The patterns
and
> null-fill is excellent. So Matt, your new integrated AP antenna
better be
> good. :)
Wish they made the sector mounting hardware out of aluminum. You get
4 of them together and they weigh a ton.
