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Old 06-21-2011, 11:21 PM   #1
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What size D rings?

What size D rings do you have on your bumper? 5/8", 3/4" or 1"?

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Old 06-21-2011, 11:37 PM   #2
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I have 3/4... Seemed more than enough.

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Old 06-21-2011, 11:38 PM   #3
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3/4
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Old 06-21-2011, 11:38 PM   #4
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Old 06-22-2011, 12:13 AM   #5
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Originally Posted by doclouie View Post
What size D rings do you have on your bumper? 5/8", 3/4" or 1"?
Most folks run the 3/4" "D-ring" although it's more correctly called an anchor shackle or bow shackle. Quality versions are rated at 4.75 tons WLL which is working load limit. The WLL of a piece of rigging rated for overhead lifting and most shackles fall into that category, 1/5th of breaking strength. That means even a 3/4" shackle is so overkill for what we use them for that it's pretty funny.

23.75 tons is 47,500 lbs of breaking strength and in comparison, most 9500 lb winches come equipped with 5/16's steel cable that is rated at 9800 lbs breaking strength. Or put another way, if it were rated the same as a shackle, the WLL would be 1960 lbs.

Don't forget that a 3/4"' shackle has a 7/8" pin diameter and your holes in your bumper tabs should be large enough that the shackle can follow the line of pull without side loading the pin.
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Old 06-22-2011, 12:28 AM   #6
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Originally Posted by Black Magic Brakes View Post
Most folks run the 3/4" "D-ring" although it's more correctly called an anchor shackle or bow shackle. Quality versions are rated at 4.75 tons WLL which is working load limit. The WLL of a piece of rigging rated for overhead lifting and most shackles fall into that category, 1/5th of breaking strength. That means even a 3/4" shackle is so overkill for what we use them for that it's pretty funny.

23.75 tons is 47,500 lbs of breaking strength and in comparison, most 9500 lb winches come equipped with 5/16's steel cable that is rated at 9800 lbs breaking strength. Or put another way, if it were rated the same as a shackle, the WLL would be 1960 lbs.

Don't forget that a 3/4"' shackle has a 7/8" pin diameter and your holes in your bumper tabs should be large enough that the shackle can follow the line of pull without side loading the pin.
i have one little bit of info to add. dont use any shackles that dont have WLL on them. all quality rigging will have the safe working loads labeled somewhere and if you dont see those numbers dont risk it. if youve got a shackle that doesnt have the WLL on it, it was probably made in china and who knows what it can handle.
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Old 06-22-2011, 12:46 AM   #7
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Quote:
Originally Posted by Black Magic Brakes View Post
Most folks run the 3/4" "D-ring" although it's more correctly called an anchor shackle or bow shackle. Quality versions are rated at 4.75 tons WLL which is working load limit. The WLL of a piece of rigging rated for overhead lifting and most shackles fall into that category, 1/5th of breaking strength. That means even a 3/4" shackle is so overkill for what we use them for that it's pretty funny.

23.75 tons is 47,500 lbs of breaking strength and in comparison, most 9500 lb winches come equipped with 5/16's steel cable that is rated at 9800 lbs breaking strength. Or put another way, if it were rated the same as a shackle, the WLL would be 1960 lbs.

Don't forget that a 3/4"' shackle has a 7/8" pin diameter and your holes in your bumper tabs should be large enough that the shackle can follow the line of pull without side loading the pin.
Thanks that is what the engineer in me wanted to hear. I am building my bumper right now and the block that goes through the bumper from front to back that the shackle attaches to has a 1" hole. That should mean that it was made for a 3/4" shackle.
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Old 06-22-2011, 01:09 AM   #8
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Thanks that is what the engineer in me wanted to hear. I am building my bumper right now and the block that goes through the bumper from front to back that the shackle attaches to has a 1" hole. That should mean that it was made for a 3/4" shackle.
That would mean it's made for a 3/4" shackle that will never see a side load. Proper rigging means that the shackle has to swivel to follow the line of pull and loading the pin at an angle is a violation of that rule.

The problem is that bumper and tab makers have decided that it's okay to build them tight because the shackle is so overrated for the job it does that you can use them incorrectly and get away with it.

That and they are more concerned with aesthetics than proper rigging. Were you to go onto a construction side with a good rigging supervisor, you would be run off, fired, or seriously berated for loading a shackle the way most of us do.

Then again, how many of us adhere to the WLL of our winch lines?
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Old 06-22-2011, 12:47 PM   #9
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3/4 you shouldnt need anything bigger.

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