18-8/304/316/... SS fasteners? - SailNet Community
 1Likes
Reply
 
LinkBack Thread Tools
post #1 of 31 Old 10-25-2010 Thread Starter
Member
 
Join Date: Sep 2010
Posts: 68
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 5
 
18-8/304/316/... SS fasteners?

I am told that one should use 316 Stainless Steel in a saltwater environment - that other 'grades' will not stand up to the environment. I also see that places like West Marine and my local fastener superstore both carry extensive 18-8 stocks of fasteners but very few (and expensive) 316 fasteners. Thoughts?

Charles
micheck is offline  
Quote Quick Reply Share with Facebook
Sponsored Links
Advertisement
 
post #2 of 31 Old 10-25-2010
Senior Member
 
mitiempo's Avatar
 
Join Date: Sep 2008
Location: Victoria B.C. Canada
Posts: 7,501
Thanks: 0
Thanked 96 Times in 87 Posts
Rep Power: 8
   
Where are you using them? I would bet most of the bolts and screws on my boat are 304 and they look good after 33 years.

Brian
Living aboard in Victoria Harbour
mitiempo is offline  
Quote Quick Reply Share with Facebook
post #3 of 31 Old 10-25-2010
Telstar 28
 
sailingdog's Avatar
 
Join Date: Mar 2006
Location: New England
Posts: 43,290
Thanks: 0
Thanked 15 Times in 12 Posts
Rep Power: 14
         
I'd point out that 304 is generally stronger than 316 as well.

Sailingdog

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Telstar 28
New England

You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.

—Cpt. Mal Reynolds, Serenity (edited)

If you're new to the Sailnet Forums... please read this
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
.

Still—DON'T READ THAT POST AGAIN.
sailingdog is offline  
Quote Quick Reply Share with Facebook
post #4 of 31 Old 10-25-2010
Senior Member
 
tommays's Avatar
 
Join Date: Sep 2008
Posts: 4,296
Thanks: 1
Thanked 30 Times in 30 Posts
Rep Power: 7
 
18-8: 300 series stainless steel having approximately (not exactly) 18% chromium and 8% nickel. The term "18-8" is used interchangeably to characterize fittings made of 302, 302HQ, 303, 304, 305, 384, XM7, and other variables of these grades with close chemical compositions. There is little overall difference in corrosion resistance among the "18-8" types, but slight differences in chemical composition do make certain grades more resistant than others do against particular chemicals or atmospheres. "18-8" has superior corrosion resistance to 400 series stainless, is generally nonmagnetic, and is hardenable only by cold working.


18-8 is covers a bit to much ground BUT i have never seen many problems in above the water line use other than staining which is pretty easy to resolve these days with a product like spotless stainless

1970 Cal 29 Sea Fever

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

1981 J24 Tangent 2930
Tommays
Northport NY


If a dirty bottom slows you down what do you think it does to your boat
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
tommays is offline  
Quote Quick Reply Share with Facebook
post #5 of 31 Old 10-25-2010
Senior Member
 
mitiempo's Avatar
 
Join Date: Sep 2008
Location: Victoria B.C. Canada
Posts: 7,501
Thanks: 0
Thanked 96 Times in 87 Posts
Rep Power: 8
   
I agree, have rarely seen problems above waterline. Stainless really should not be used underwater anyway.

Brian
Living aboard in Victoria Harbour
mitiempo is offline  
Quote Quick Reply Share with Facebook
post #6 of 31 Old 11-20-2010
Junior Member
 
Join Date: Sep 2010
Posts: 6
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
 
Marine grade stainless steel is 316 or 316L - period.

Cliams like "built of high quality marine grade 304 stainless" are blatent lies.

Stainless steel is a very big subject and if you want to learn it, there are plenty of resources on the web to do so. But if you haven't got the time then take the advices of the SS manufacturers - every one of them identifies 316 as the Marine grade.

Parts manufacturers on the other hand are competing with other parts manufacturers who use claims like "built of high quality marine grade 304 stainless" and in a price driven market are using the cheaper SS to compete.
Boat manufacturers use 304 because it will last past their warranty period, beyond that they don't care, in fact they would prefer it to rust.

Easiest test to establish grade is to use a magnet - 304 is magnetic, 316 is not, (except where it has been welded)

A magnet is also useful when buying hose clamps - many have 316 bands but use 304 screws - a fact responsible for many failures and several sinkings...
Bloke is offline  
Quote Quick Reply Share with Facebook
post #7 of 31 Old 11-21-2010
Telstar 28
 
sailingdog's Avatar
 
Join Date: Mar 2006
Location: New England
Posts: 43,290
Thanks: 0
Thanked 15 Times in 12 Posts
Rep Power: 14
         
You'd be a lot more credible if you knew what you were talking about. A lot of good marine hardware is made of 304 grade stainless steel, which is non-magnetic. The cheaper martenistic grades of stainless steel are magnetic, but the 300 series of austenitic stainless steels are not.

Quote:
Originally Posted by Bloke View Post
Marine grade stainless steel is 316 or 316L - period.

Cliams like "built of high quality marine grade 304 stainless" are blatent lies.

Stainless steel is a very big subject and if you want to learn it, there are plenty of resources on the web to do so. But if you haven't got the time then take the advices of the SS manufacturers - every one of them identifies 316 as the Marine grade.

Parts manufacturers on the other hand are competing with other parts manufacturers who use claims like "built of high quality marine grade 304 stainless" and in a price driven market are using the cheaper SS to compete.
Boat manufacturers use 304 because it will last past their warranty period, beyond that they don't care, in fact they would prefer it to rust.

Easiest test to establish grade is to use a magnet - 304 is magnetic, 316 is not, (except where it has been welded)

A magnet is also useful when buying hose clamps - many have 316 bands but use 304 screws - a fact responsible for many failures and several sinkings...

Sailingdog

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Telstar 28
New England

You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.

—Cpt. Mal Reynolds, Serenity (edited)

If you're new to the Sailnet Forums... please read this
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
.

Still—DON'T READ THAT POST AGAIN.
sailingdog is offline  
Quote Quick Reply Share with Facebook
post #8 of 31 Old 11-21-2010
Seńor Member
 
PorFin's Avatar
 
Join Date: Sep 2007
Posts: 1,444
Thanks: 8
Thanked 18 Times in 18 Posts
Rep Power: 8
 
Quote:
Originally Posted by sailingdog View Post
You'd be a lot more credible if you knew what you were talking about.
Boy, I just had a flashback -- my Dad used to say that to me a lot!

Other pearls were
o "You could probably see a lot better if you'd get your head out of your a$$."
o "How's the light up there, dimwit?"
and truly a classic -- "Any damn fool can break a shovel handle."

Last edited by PorFin; 11-21-2010 at 04:38 PM.
PorFin is offline  
Quote Quick Reply Share with Facebook
post #9 of 31 Old 11-21-2010
Grasshopper
 
JiffyLube's Avatar
 
Join Date: Jan 2008
Location: Oceanside, Ca.
Posts: 896
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 8
 
I have this Harkin pad eye with a 3" base (heavy duty), that is 17-4 and magnetic. I read that 17-4 is suppose to be similar to 304, but I can safely say I don't know what I'm talking about on this subject.
JiffyLube is offline  
Quote Quick Reply Share with Facebook
post #10 of 31 Old 11-26-2010
Junior Member
 
Join Date: Sep 2010
Posts: 6
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
 
Quote:
Originally Posted by sailingdog View Post
You'd be a lot more credible if you knew what you were talking about. A lot of good marine hardware is made of 304 grade stainless steel, which is non-magnetic. The cheaper martenistic grades of stainless steel are magnetic, but the 300 series of austenitic stainless steels are not.
ha! :-)
I used to think that too, was taught it fact.
Experience has proven my teachers to be wrong in so many things. - like the idea that the 300 series is all non magnetic... try it, you'll be surprised too.

Like I said, SS is a big subject - but as general rule 316 is the most corosion resistant and the only one I would consider "Marine grade" (even though it will still rust - they all will).

"Good marine hardware made of 304"?
Just last week I had to throw away my boarding ladder - 304 and rusted out from the inside - Couldn't buy one in 316, so had to build one.

"If I knew what I was talking about"... cheap shot - You got shares in a chandlery or something?
Bloke is offline  
Quote Quick Reply Share with Facebook
Reply

Quick Reply
Message:
Options

By choosing to post the reply above you agree to the rules you agreed to when joining Sailnet.
Click Here to view those rules.

Register Now



In order to be able to post messages on the SailNet Community forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
Please note: After entering 3 characters a list of Usernames already in use will appear and the list will disappear once a valid Username is entered.


User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Forum Replies Last Post
hatch fasteners Fitz87 Gear & Maintenance 2 10-12-2010 10:44 AM
Source for unusual 316 SS fasteners? mrybas Gear & Maintenance 3 06-06-2010 04:25 PM
Removing 3M 101 from fasteners OhioTom Gear & Maintenance 3 07-29-2009 06:37 PM
Cleaning up stainless fasteners in aluminum masthead mepsnbarry Gear & Maintenance 11 04-24-2009 02:16 PM
Fasteners for bronze hardware? txmatt Gear & Maintenance 7 02-08-2007 10:51 PM

Posting Rules  
You may post new threads
You may 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 On
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome