Cruisers Forum
 


Reply
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on Cruisers Forums. Advertise Here
 
Thread Tools Search this Thread Rate Thread Display Modes
Old 10-01-2010, 13:11   #1
Registered User
 
Patrick_DeepPlaya's Avatar

Join Date: Feb 2008
Location: Seattle, WA
Posts: 262
What Grade of Aluminum for Masthead Arm?

I want to use a 3" wide piece of Aluminum flat bar to install a Maretron WSO100 on my masthead. The reason for the 3" width is it would allow me to drill through and use the WSO100's three screws for attaching to the bar and it won't impinge on the humidity sensor which sticks out slightly from the bottom.

Are any of these grades available at Online Metals acceptable?
  • 2024-T351 ALUMINUM RECTANGLE BAR
  • 2024-T4 ALUMINUM RECTANGLE BAR
  • 6061-T6 ALUMINUM RECTANGLE BAR
  • 7075-T6/T651 COLD FINISH ALUMINUM RECTANGLE BAR

In terms of thickness, what is available differs by the type of Aluminum. I have a piece of 2' piece of 1/4"x2" here that seems stout enough, it's just not wide enough to get good purchase on the WSO100 so I'm planning on going with 1/4" or 3/8" depending on the material. If anyone feels strongly about the thickness please chime in on that as well.

Thanks!
__________________
https://www.DeepPlaya.com | Twitter: @DeepPlaya
Patrick_DeepPlaya is offline   Reply With Quote
Old 10-01-2010, 13:37   #2
֍֎֍֎֍֎֍֎֍֎

Join Date: Apr 2006
Posts: 15,129
Patrick, I'd think whichever alloy has the greatest resistance to salt corrosion is the one you'd be looking for. But at the same time...if you have a local plexi supplier, how about a piece of 3/8" or 1/2" plexi or lexan? Should be locally available, won't corrode or need paint, and if you're lucky they'll have a piece available in white, if you'd prefer. Better cheaper faster?
hellosailor is offline   Reply With Quote
Old 10-01-2010, 13:44   #3
Senior Cruiser
 
GordMay's Avatar

Cruisers Forum Supporter

Join Date: Mar 2003
Location: Thunder Bay, Ontario - 48-29N x 89-20W
Boat: (Cruiser Living On Dirt)
Posts: 38,673
Images: 241
Any of the Heat treated "T6" alloys.
6061-T6 is what your mast is probably made of.
__________________
Gord May
"If you didn't have the time or money to do it right in the first place, when will you get the time/$ to fix it?"



GordMay is offline   Reply With Quote
Old 10-01-2010, 14:22   #4
Registered User

Join Date: Nov 2005
Location: Tasmania
Boat: VandeStadt IOR 40' - Insatiable
Posts: 2,317
Images: 91
I'd choose the 6061... it is very commonly used by the builders of commercial aluminium vessels.
Weyalan is offline   Reply With Quote
Old 10-01-2010, 16:15   #5
Senior Cruiser
 
delmarrey's Avatar

Cruisers Forum Supporter

Join Date: Mar 2003
Location: Philippines
Boat: Itís in French Polynesia now
Posts: 11,208
Images: 122
5052 or 5056 is commonly use in the marine industry for hull construction (corrosion resistant) but the top of a mast 6061 T6 would be stronger.

2024 is for extrusions (moldings-soft) and 7075 is a hi-grade aircraft material.
__________________
Faithful are the Wounds of a Friend, but the Kisses of the Enemy are Deceitful! ........
The measure of a man is how he navigates to a proper shore in the mist of a storm!
delmarrey is offline   Reply With Quote
Old 11-01-2010, 12:35   #6
Registered User
 
Patrick_DeepPlaya's Avatar

Join Date: Feb 2008
Location: Seattle, WA
Posts: 262
Thanks everyone for the tech info, exactly what I needed!

Lucky for me, Online Metals is right here in Seattle, WA and they have will call pickups!

-p
__________________
https://www.DeepPlaya.com | Twitter: @DeepPlaya
Patrick_DeepPlaya is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

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
Engine Oil Quantity & Grade for MD22 P sybobcat Engines and Propulsion Systems 8 03-08-2009 05:04
For Sale: New Rigging Wire 3/8" 1x19 Grade 316 dkall Classifieds Archive 2 21-07-2009 03:39
Hatch Arm cazimmy Construction, Maintenance & Refit 5 20-05-2008 07:43
Single grade oil? Han Engines and Propulsion Systems 18 10-12-2007 18:48
Do you arm your vessel when voyageing???? wolfgang Health, Safety & Related Gear 3 11-11-2006 04:00

Advertise Here


All times are GMT -7. The time now is 16:42.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2020, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.