Reply
 
Thread Tools Search this Thread Display Modes
 
Old 01-28-2012, 12:02 AM   #1
2 Rivet Member
 
1974 27' Overlander
Twisp , Washington
Join Date: Apr 2010
Posts: 73
Screwy question...

Sorry, sometimes I crack myself up :-). And no, my wife doesn't appreciate my sense of humor, either.

I'm rebuilding all my windows, and luckily, none of the steel sheet metal screws holding the Plexiglas inner panes to the outer panes have been frozen or so corroded that they broke. But most of them are pretty rusty, so I'm planning on replacing all of them. My question is, should I stay with the galvanized screws, or would I be better off going with stainless steel? I know that electrolysis is an issue with dissimilar metals, but I can NOT remember if it's more or less of a problem with stainless vs. galvanized. Thanks.

Dave
__________________

__________________
daved20319 is offline   Reply With Quote
Old 01-28-2012, 03:17 AM   #2
Rivet Master
 
NevadaGeo's Avatar
 
1978 31' Excella 500
Genoa , Nevada
Join Date: Jul 2007
Posts: 1,305
Good question, zinc galvanized versus chrome stainless. I suspect the chrome will dissasociate less into the surrounding aluminum than the zinc. It would be nice if there was an aluminum screw strong enough to do the job.
You might try to repost this again in the daylite hours, the thread might disappear before morning.
__________________

__________________
I admit to being powerless over housecleaning and social niceities
Airforums 22655 and now, WBCCI 22655

NevadaGeo
NevadaGeo is offline   Reply With Quote
Old 01-28-2012, 09:23 AM   #3
4 Rivet Member
 
samb's Avatar
 
1961 22' Safari
Union , Oregon
Join Date: Jan 2007
Posts: 451
Images: 11
I have used stainless steel screws on aluminum trailers for years and have no problems with dissimilar metals corrosion.
Sam
__________________
samb is offline   Reply With Quote
Old 01-28-2012, 09:36 AM   #4
Don't forget your cat nap
 
Ag&Au's Avatar
 
Port Orchard , Washington
Join Date: May 2009
Posts: 4,464
Images: 1
The reason stainless stains less is because it is less reactive other substances. Galvenizing is coating iron or steel with zinc. So until the galvenizing is broken down, It wil react with other sutances as though it were zinc. Zinc is used in some appliocations as a sacrificial piece of metal allowed to deteriorate to provide corrosion protection to other metals. I would infer from this that galvenizing is not a excellent long term solution. Keep in mind that there are different grades of stainless and I have bought some that has rusted. I am sure the is some other way to identify good from bad stainless, but not knowing what that is for sure, I rely on price.

Ken
__________________
Ag&Au is offline   Reply With Quote
Old 01-28-2012, 09:50 AM   #5
Rivet Master

 
Southwestern , Ohio
Join Date: Nov 2006
Posts: 1,669
Quote:
Originally Posted by daved20319 View Post
My question is, should I stay with the galvanized screws, or would I be better off going with stainless steel? I know that electrolysis is an issue with dissimilar metals, but I can NOT remember if it's more or less of a problem with stainless vs. galvanized. Thanks.
Go with the stainless screws. Although the nickel and chromium content of stainless steel could create a galvanic couple, it doesn't, because the thing that makes stainless steel "stainless" is that it forms an adherent oxide layer on the surface of the metal that prevents it from oxidizing further.
.
__________________
Nuvite-F is offline   Reply With Quote
Old 01-29-2012, 02:13 AM   #6
Rivet Master
 
NevadaGeo's Avatar
 
1978 31' Excella 500
Genoa , Nevada
Join Date: Jul 2007
Posts: 1,305
Quote:
Originally Posted by w7ts View Post
. I am sure the is some other way to identify good from bad stainless, but not knowing what that is for sure, I rely on price.
Ken
Good stainless won't stick to a magnet, I don't think.
__________________
I admit to being powerless over housecleaning and social niceities
Airforums 22655 and now, WBCCI 22655

NevadaGeo
NevadaGeo is offline   Reply With Quote
Old 01-29-2012, 04:04 AM   #7
Rivet Master
 
1977 31' Sovereign
1963 26' Overlander
1989 34' Excella
Johnsburg , Illinois
Join Date: Jul 2005
Posts: 2,941
300 series stainless steel is non-magnetic. Stain resistant 400 series is magnetic. Fasteners are usually 302 or 304. That is what I usually use. 400 series is capable of being hardened and can be used to make knifes that actually hold an edge. Don't buy a stainless steel knife that is non-magnetic.
__________________
dwightdi is offline   Reply With Quote
Old 01-29-2012, 07:56 AM   #8
CLOUDSPLITTER "Tahawas"
 
ROBERT CROSS's Avatar

 
2003 25' Classic
Zanadude Nebula , WNY
Join Date: Jun 2007
Posts: 11,153
Images: 1
Thumbs up

POI....replace ALL your exterior screws with stainless....clearance lights etc.

Ask me how I know.

Quote:
Originally Posted by NevadaGeo View Post
Good stainless won't stick to a magnet, I don't think.
.......yep.

Bob
__________________
PFC.....

“After all these years the reason I continue to love Thanksgiving.....I still sit at the kids table.”
RLC

Sandra wanted to go to Cleveland on vacation,
but I’m the Husband, so we went to Cleveland.
RLC
ROBERT CROSS is offline   Reply With Quote
Old 01-29-2012, 08:15 AM   #9
4 Rivet Member
 
scf31's Avatar
 
1977 25' Caravanner
Jeffersonville , Kentucky
Join Date: Jul 2004
Posts: 490
Images: 23
I work in the Aircraft refurbish department, We always install hardware/fasteners wet with primer when dissimilar metals are used. a rule of thumb.
__________________
Movie Stars and Film Crews come to Me from hundreds of miles enticed by My knowledge, My imagination,expertise, creativity and innovations!
scf31 is offline   Reply With Quote
Old 01-29-2012, 10:10 AM   #10
3 Rivet Member
 
1980 31' Excella II
Ocean View , Delaware
Join Date: Dec 2010
Posts: 144
Quote:
Originally Posted by scf31 View Post
I work in the Aircraft refurbish department, We always install hardware/fasteners wet with primer when dissimilar metals are used. a rule of thumb.
What type of primer?

Thanks,
Sue
__________________
Disneysue925 is offline   Reply With Quote
Old 01-29-2012, 10:22 AM   #11
CLOUDSPLITTER "Tahawas"
 
ROBERT CROSS's Avatar

 
2003 25' Classic
Zanadude Nebula , WNY
Join Date: Jun 2007
Posts: 11,153
Images: 1
Quote:
Originally Posted by Disneysue925 View Post
What type of primer?

Thanks,
Sue
Zinc-chromate or any one of the approved AS sealants.

Usually just a dab of acryl-r on the threads works for me

Bob
__________________
PFC.....

“After all these years the reason I continue to love Thanksgiving.....I still sit at the kids table.”
RLC

Sandra wanted to go to Cleveland on vacation,
but I’m the Husband, so we went to Cleveland.
RLC
ROBERT CROSS is offline   Reply With Quote
Old 01-29-2012, 11:09 AM   #12
Rivet Master
 
Bob Thompson's Avatar
 
Corpus Christi , Texas
Join Date: Sep 2003
Posts: 936
Images: 67
The common grades of stainless steel most of us have access to is Food Grade T304 and Marine Grade 316. There are many other grades, such as those used in medical implants, the above are the common ones. You want the Marine Grade 316 SS. I usually buy at West Marine.
__________________
So Long!
Bob Thompson is offline   Reply With Quote
Old 01-31-2012, 11:08 AM   #13
2 Rivet Member
 
1974 27' Overlander
Twisp , Washington
Join Date: Apr 2010
Posts: 73
Going with 316 stainless...

Thanks for all the responses. Bob, I didn't check prices at West Marine, but I was able to order them from McMaster-Carr for less than a penny apiece. I think I now have everything either here or on the way to wrap this part of the project up by the end of the week, early next week at the latest . Which is good, I'm heartily sick of playing with glass by now. Later.

Dave
__________________
daved20319 is offline   Reply With Quote
Old 01-31-2012, 01:16 PM   #14
CLOUDSPLITTER "Tahawas"
 
ROBERT CROSS's Avatar

 
2003 25' Classic
Zanadude Nebula , WNY
Join Date: Jun 2007
Posts: 11,153
Images: 1
Dave,

Got these from McM-C... also stainless....nice up-grade. K 300 series lockable

Bob
Attached Thumbnails
Click image for larger version

Name:	DSC07846.jpg
Views:	49
Size:	276.3 KB
ID:	149961   Click image for larger version

Name:	DSC07847.jpg
Views:	49
Size:	230.2 KB
ID:	149962  

__________________

__________________
PFC.....

“After all these years the reason I continue to love Thanksgiving.....I still sit at the kids table.”
RLC

Sandra wanted to go to Cleveland on vacation,
but I’m the Husband, so we went to Cleveland.
RLC
ROBERT CROSS is offline   Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Quick window question... daved20319 Windows & Screens 2 01-17-2012 05:44 PM
Steel / Aluminum wheel question polarlyse Wheels, Hubs & Bearings 12 05-29-2011 08:49 PM
1980 Caravelle axle question Seymour Axles 5 05-14-2011 09:28 PM
A question on selling awnings Airy Awnings 21 04-24-2011 11:37 AM
Blasphemous question woytovich General Repair Forum 15 04-09-2011 09:36 AM


Virginia Campgrounds

Reviews provided by




Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 12:09 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.

Airstream is a registered trademark of Airstream Inc. All rights reserved. Airstream trademark used under license to Social Knowledge LLC.