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 Catalina 25 Specific Forum
 keel hanger bolt quality		  New Topic  Topic Locked
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weluvlife
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166 Posts
Initially Posted - 11/03/2005 :  13:46:07  Show Profile  Visit weluvlife's Homepage
Hi,

Should we use a 316 stainless bolt for the keel hangers or is the 304 good enough? How about the grade 8 zinc bolts in fresh water?

Mark
Mark Eichman
Lake Don Pedro,CA
www.lakedonpedrosailingclub.org
'86 c25 TR, SK
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ClamBeach
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3072 Posts
Response Posted - 11/03/2005 :  22:44:20  Show Profile
I'd go with 316 or Silicon Bronze. It's not something you want to fail.
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weluvlife
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Response Posted - 11/03/2005 :  23:19:24  Show Profile  Visit weluvlife's Homepage
Hello ClamBeach,

What is the difference between the 316 and the 304 SS? I was told today that there is no difference in strength? Is is just corrosion resistance?

Tell me about the Silicon Bronze please.

Thanks,
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Leon Sisson
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USA
1893 Posts
Response Posted - 11/04/2005 :  09:41:23  Show Profile  Visit Leon Sisson's Homepage
Mark E,

As I recall, the economical 304 alloy stainless steel is about 10% stronger than the twice as costly 316 stainless steel. However, the 304 alloy rusts a <b><i>LOT</i></b> faster than 316 alloy. (That's exactly why 316 is so popular with boaters and 304 is prefered by manufacturers.)

I suggest you check the relative strengths of silicon bronze compared to either stainless alloy. At 3/8", there isn't a whole lot of safety factor overkill designed into those keel hanger bolts, so don't go weaker than 316 stainless.

On my 1979 C-25 kept in tropical salt water, I replace the stainless steel bolts every two years or so. I also added a back up support under the keel hangers made from silicon bronze. The work involved isn't for the lazy or faint of heart.

-- Leon Sisson
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weluvlife
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Response Posted - 11/04/2005 :  18:13:06  Show Profile  Visit weluvlife's Homepage
Thanks for the info Leon.

With the Silicon Bronze bolts, I'm concerned with electrolysis between the bolt and the female threads in screws in to.

I may just stay with the 304 SS, because it is a little stronger than the 316.

Should an anti-seize or a medium thread-lock product be used on the keel bolt threads?

Thanks,
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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.