Originally Posted by FanaticFringer
The 12' tie downs say they have a working capacity of 333lbs.
How does the 1500lb breaking strength figure into this?
According to the Cordage Institute's Fiber Robe Technical Information and Application Manual
Working Load is between 1/5 and 1/12 of a line's minimum breaking strength, depending on safety factors. In practice, I've rarely seen a working load that was less
than 1/5. "Minimum Breaking Strength" is itself defined as being 2 standard deviations below the average tested breaking strength. I leave it to the engineers here to do whatever engineers do with this kind of information.
NOTE: Webbing is obviously different from "Fiber Rope" and the Cordage Institute is not a trade association for webbing manufacturers. Standards for webbing are set by the Web Sling and Tie Down Association. The standards for webbing (WSTDA-T-4) were revised last year. I haven't actually seen the new standards.