M211 shackle strength?

[Ashley P]

I've got an old m211 . If I assume that it's shackles are original, what load rating are they? (The shackles that hang on the bumpers for hooking and pulling.)

 

[NDT]

15,000 tare + 10,000 payload=25,000 gross X 1.5=37,500 /4= 10,000 each?

 

[JD4044M]

Here is some Shackle loading information. Show how it changes depending on use and safety ratings.Shackles

I was building some booms for my tractor front end loader and needed to calculate the loads on the boom and chains for the support at 500 lbs max 20 ft out. Was surprised how much strain was on the chain. I used this site for my formulas and built it. Bought a Electronic Scale and boy almost right on the button for what they said it would be. Can't remember the numbers but I had a 1-3 safety factor.
Crain Loads

 

[Squirt-Truck]

The GMC's had a unique shackle, do you have a full set?
They have integral tie chain tabs.

 

[Ashley P]

I've only got 2, each with a chain on the pin and chain on a cotter pin.

No definite load rating for them?