Standing rigging- Doing it myself - Page 3 - SailNet Community
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post #21 of 23 Old 06-30-2011
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Originally Posted by sailor50 View Post
Sta-Loc Fittings.

Most standing rigging wire used today is type 316. Lesser numbers 302, etc., have more monel and are more costly, used in the aircraft industry, construction, etc.
No Stainless Steel contains any Monel. It does contain Molybdenum. 316 is preferred in a marine environment to 302 and 304 because of it's increased corrosion resistance. Tensile strength of 316 is slightly less (I found 580 MPa for 316 vs. 600 for 302 at one manufacturer, 10% difference for wire at McMasterCarr). The important consideration is that 316 will have greater tensile strength after a number of years as it will be less corroded. My understanding is that rigging failure is usually some kind of stress-corrosion fracture at a fitting so 316 should help reduce the likelihood of that.

I also looked up 308, and 316 again has slightly lower tensile strength but better corrosion resistance.

I looked up the raw cost of 302, 304, and 316 wire at McMasterCarr and 316 is the most expensive, so use of 316 can't be put down to money-saving efforts.

I think 316 is the best for the job. I'm not sure the reduction in strength of 10% justifies an increase in size unless it was considered undersized to start with. Some boats are considered to have had undersized rigging from the factory. I think the C27 was one.
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post #22 of 23 Old 06-30-2011
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I have rerigged with, and was very happy with their prices and service. I used the Hayn fittings, and they were quite easy to assemble. The whole project took me less than 8 hours with the mast(66ft) down. It would take more time to replace things one a time while the mast is up, but you can diy if you can talk your wife into assisting you...
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post #23 of 23 Old 06-30-2011
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Thanks for the correction, I got my metal M words confused!
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