tie down strap working load verus break strength
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    tie down strap working load verus break strength

    Can somebody explain the difference between working load and break strength of tie down straps and why they advertise both?

    Also if you use multiple straps is the working load cumulative or should each strap be higher than your load?

    For example lets say a tractor weights 2500 lbs. Should each strap have a working load over 2500 lbs, or if you use 2 straps can they both have a working load of 2000 and you will be safe because the total 4000 working load is higher than 2500 load weight?

    I have always tried to have each strap have a working load higher than the load weight. I'm in the market for some new straps now and really don't want or need 25 or 30 foot straps again, but all of the shorter straps have a lower working load weight. This has me pondering the above questions.
    Last edited by kabic; 02-04-2014 at 10:59 AM.
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    Doing some research I have found that normally working load is 1/3 of the break strength.

    This document makes me think I have been really over killing the tie down of by 1023E.

    http://ohioline.osu.edu/aex-fact/pdf/0598.pdf

    It is recommended that the total working load
    limit (WLL) of all used tie-downs must equal at least
    half of the cargo’s weight. For example, if you are
    hauling a small tractor that weighs 12,000 pounds, at
    least four tie-downs with a combined WLL of 6,000
    pounds (1,500 pounds each) will need to be used.
    To find this aggregate working load limit depends
    on how the chain or strap is secured.
    One method is to connect directly to a manufactured
    anchored point on the trailer then through, over, or
    around the cargo to another manufactured trailer
    point. This is referred to as an
    indirect tie-down
    and has the full WLL rating of the chain or strap
    The second method is adirect tie-down This is
    when a tie-down is attached from a manufactured
    anchor point on the truck or trailer to an attachment
    point on the cargo (i.e., frame of vehicle or equip
    ment). Using this method of tie-down provides half
    of the WLL of the chain or strap
    Last edited by kabic; 02-04-2014 at 12:53 PM.
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    56FordGuy's Avatar
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    They advertise breaking strength because it makes the straps sound stronger.

    If you have a 2,000 lb load to secure, your straps need to add up to 2,000lbs working capacity. I prefer to go with straps or chains equivalent to the load in the front and rear. For a 2k load I'd have straps in the rear adding up to 2k, and the same in the front for 4k total. It's probably overkill, but the forces experienced in an accident can be massive.

    You can always buy the long ratchet straps and cut off what you don't want.
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    felixm22's Avatar
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    Load strengt is a static number. When you add motion, i.e. haling your tractor on a trailer, a 2,300 lbs it could weigh double that if stopping fast, thus it is good to know how much the strap will handle before it breaks. I would love to give you all of the math on increase in force due to change in speed but I have forgotten all of the math.
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    Quote Originally Posted by 56FordGuy View Post
    If you have a 2,000 lb load to secure, your straps need to add up to 2,000lbs working capacity.
    This is always what I though to, but all the sites I have been reading are saying the straps only need to be 1/2 the load to be secured so a total of 1000 lbs working load in this example.

    I agree with you that it it better to be safe than sorry and use a higher working load. I will continue to make sure the total WLL is over the weight of my cargo.
    Last edited by kabic; 02-04-2014 at 01:03 PM.
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    I usually just get a 10k strap for each corner. My tractor or my Jeep is not going anywhere I don't want them to go. More importantly is use as short and as straight of connection as you are able and don't cross-over the straps. If one breaks or comes loose the other has a gob of slack.

    I believe in overkill.

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    I currently am using 2 10,000# straps on the rear and 2 5,000# on the front of my 1025R tractor. I feel the back needs higher rated straps due to the extra stress in case of a panic stop. I would not consider using less. My straps originally were 30 feet long, but that was such a hassle, that I cut them down to 8-10 feet.

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    Here is some good article's written by Fritz Dahlin from B/A Products. Fritz is a expert in this stuff, he assisted me (actually I assisted him I guess) in the proof testing of my hooks. This focus of these articles are geared more towards the towing industry (their primary business), but the info applies the same to strapping a tractor down.

    http://baprod.com/images/stories/wll_article.pdf

    http://baprod.com/images/stories/web_article.pdf

    http://baprod.com/images/stories/twist_or_knot.pdf

    http://baprod.com/images/stories/recovery_straps.pdf

    http://baprod.com/images/stories/chain_article.pdf

    http://baprod.com/images/stories/testing_article.pdf
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    Keeper of the GTT Cookies dieselshadow's Avatar
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    Quote Originally Posted by Kennyd View Post
    Here is some good article's written by Fritz Dahlin from B/A Products. Fritz is a expert in this stuff, he assisted me (actually I assisted him I guess) in the proof testing of my hooks. This focus of these articles are geared more towards the towing industry (their primary business), but the info applies the same to strapping a tractor down.

    http://baprod.com/images/stories/wll_article.pdf

    http://baprod.com/images/stories/web_article.pdf

    http://baprod.com/images/stories/twist_or_knot.pdf

    http://baprod.com/images/stories/recovery_straps.pdf

    http://baprod.com/images/stories/chain_article.pdf

    http://baprod.com/images/stories/testing_article.pdf
    This is great Kenny. Perhaps we should put a copy of these in the tech library?
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    It always baffled me that 4 straps was all DOT legal, when Mass X Vel. squared was the number rolling around in my head....considering I'm in the truck in front of the thing.

    8,000lbs X 50mph squared equals 20 straps and a chain or two.

    I mentioned it one day to my cousin, who is a bit of a Nerd (Spray Pilot/ former Corpsman), and he brought up attachment angle influencing the amount of force exerted in a linear direction, and possibly needing to be considered.

    The law says one thing, reality dictates others quite often. Like when ya run out of sound attachment points.

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