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Old 03-20-2006, 08:36 PM
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Default Stainless Fasteners 18-8 vs 316?

I finally had enough. I bought a Sailfish last year and every bit of stainless on the boat has rust on it. I am going to replace every bit that I can disconnect. Every store I go to carries 18 - 10 stainless. Jamestown Distributors says in their catalogues that 316 is better. Very little is available. I just spent a hundred bucks on ten boxes of fasteners today. Only half of them are 316. Do you think the 18 - 10 is better than what the boat came with or should I scour the Universe to find the remaining hardware in 316?
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Old 03-20-2006, 08:39 PM
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Default RE: Stainless Fasteners 18-8 vs 316?

316 wont show the rust or rust trails
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Old 03-20-2006, 09:31 PM
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Default Re: Stainless Fasteners 18-8 vs 316?

Here's a quick rundown on stainless grades. It's the Molybdenum that you want (and 316 has). That provides the protection against pitting, which is what the chlorides in salt water are so effective at causing. That said, the corrosion problems you have may not be due to 304 SS used, but a poor quality 304 stainless. Also, if on installation of the screw they are stressed or the oxide coating is damaged on the stainless, corrosion will likely occur.

Type 304
The most common of austenitic grades, containing approximately 18% chromium and 8% nickel. It is used for chemical processing equipment, for food, dairy, and beverage industries, for heat exchangers, and for the milder chemicals.

Type 316
Contains 16% to 18% chromium and 11% to 14% nickel. It also has molybdenum added to the nickel and chrome of the 304. The molybdenum is used to control pit type attack. Type 316 is used in chemical processing, the pulp and paper industry, for food and beverage processing and dispensing and in the more corrosive environments. The molybdenum must be a minimum of 2%.

Type 317
Contains a higher percentage of molybdenum than 316 for highly corrosive environments. It must have a minimum of 3% “moly”. It is often used in stacks which contain scrubbers.

Type 317L
Restricts maximum carbon content to 0.030% max. and silicon to 0.75% max. for extra corrosion resistance.

Type 317LM
Requires molybdenum content of 4.00% min.

Type 317LMN
Requires molybdenum content of 4.00% min. and nitrogen of .15% min.

Type 321

Type 347
These types have been developed for corrosive resistance for repeated intermittent exposure to temperature above 800 degrees F. Type 321 is made by the addition of titanium and Type 347 is made by the addition of tantalum/columbium. These grades are primarily used in the aircraft industry.

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Old 03-20-2006, 09:32 PM
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Default RE: Stainless Fasteners 18-8 vs 316?

Quote:
Mac25 - 3/20/2006 8:39 PM

316 wont show the rust or rust trails
Or...like Mac said.
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Old 03-20-2006, 10:20 PM
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Default RE: Stainless Fasteners 18-8 vs 316?

Go to:

www.mcmaster.com

They have what you want and explain everything in detail.
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Old 03-21-2006, 12:21 AM
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Default Re: Stainless Fasteners 18-8 vs 316?

18-8 is 304 stainless. 316 is considered marine grade. 304 is slightly stronger, but not nearly as corrosion resistant.
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Old 03-21-2006, 08:32 AM
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Default Re: Stainless Fasteners 18-8 vs 316?

Rob, can you email me some pics of your rusted areas, I am interested to see where they are. My dealer is the number 2 SF dealer in America, and I would like to show them the pics. lupton@direcway.com.
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Old 03-21-2006, 09:08 AM
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Default Re: Stainless Fasteners 18-8 vs 316?

Hello everybody,
I have the same problem as rob p on my 2005 236, but in a milder case. I detailed my boat this last weekend and every single screw all the way around the rub rail has rust on it. Nothing really bad at this time, but I see it coming, I will have to replace every single one of them with 316 Stainless. Crappy thing is that my boat had only been in the water 2 times at the point I noticed it. Every single nut and bolt involved with the port side dive platform is severly rusting already and I'll replace all that hardwared today because it has already reached the point where I think it must come off. I had heard this before, and thought they had fixed it for 2005, but I'm guessing that they meant that it was fixed for 2006....
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Old 03-21-2006, 09:49 AM
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Default Re: Stainless Fasteners 18-8 vs 316?

http://www.boltdepot.com/
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Old 03-21-2006, 09:57 AM
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Default Re: Stainless Fasteners 18-8 vs 316?

FWIW, there's a really good read [red]here[/red] on the various grades of stainless steels and the 8 typical forms of corrosion, of which only a few have a major adverse impact on SSs.
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Old 03-21-2006, 10:11 AM
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Default RE: Stainless Fasteners 18-8 vs 316?

How do you get the rust trails off? I have some on my boat around the hand rail bases and hinges. Andy
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Old 03-21-2006, 10:48 AM
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Default Re: Stainless Fasteners 18-8 vs 316?

Any oxalic acid product such as Davis FSR will take rust of with zero effort.
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