ShapeShifter
Buffalo, NY
Senior Member
Joined: 04/03/2007
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Hookum wrote:A rated chain has a 4 to 1 safety factor. Working Load vs breaking strength. Does that make you feel any better?
No, not really, it doesn't make me feel better.
Isn't that rating factor already taken into account when the required load rating is specified? If you put on chains or cables that are half of the recommended rating, they're still half of the recommended rating.
You'd be encroaching on the built in safety factor. If that was good enough, then that is what the rating recommendation would be.
2007 Holiday Rambler Endeavor 40PDQ
400 ISL Cummins/Allison
2002 Chevy Avalanche toad
Inside: Him, Her, and a pack of little furballs...
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Airstreamer67
Pineville, LA USA
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Joined: 11/07/2002
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Each of the tow safety chains on my rig, which came from a dealer, has a tab which says it is rated at 1900-pounds "SWL" (standard working load?), and a 7600-pound "Ultimate Breaking Load." This follows the 4-to-1 rule cited above.
I think the chain is 5/8-inch-diameter links, which is not a small chain.
My tow weighs 6000 pounds. So, to depend on the SWL rating (1900 X 2= 3600) means I have a too-small chain. But, to depend on the "ultimate breaking load" (7600 X 2 = 15,200) means I have an abundance of margin.
Which is the correct assumption?
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texasbaskets
Frisco, TX
Senior Member
Joined: 10/06/2003
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Washington State Safety Chain Requirements - Minimum Strength.
Couldn't find specs for state of Maine, but it looks like Washington would require the min. strength of each to be 5,000 lbs. for a Class III hitch.
Michael, Kay, Hans (our Mini-Schnauzer co-pilot) and Prissy (Hans' Malti-Poo co-pilot)
'05 Coachmen SportsCoach SE 372DS a.k.a.  "Mana's Cabana"
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