FlyFishermen
Observer
I am looking at the Green Pin shackles from Van Beest. It appears that their WLL ratings are metric tonnes = 2204.6lb/tonne.
I am looking for a quality shackle that will be good/safe to 36,000lbs. I am thinking the Proof Load would be good to go off of as the shackles would never be under a "normal" or "steady" load, such as a permanent load. Proof load, from what I recall with bolts, is the stress a bolt can be under before it begins to deform. I am not sure how that exactly correlates to shackles though.
Proof Load on the Green Pin screw pin shackles is 2x WLL.
If my math is correct - the 8.5T rated 1-1/8" pin (1" bow) shackles will work:
WLL = 8.5x2204.6 = 18739 x2 = 37478 lbs proof load. Breaking load is 6x WLL, or 112,435lbs.
The next size up is a 9.5 tonne = 41887 lb proof load, 125,662lbs breaking load.
Thoughts?
I am looking for a quality shackle that will be good/safe to 36,000lbs. I am thinking the Proof Load would be good to go off of as the shackles would never be under a "normal" or "steady" load, such as a permanent load. Proof load, from what I recall with bolts, is the stress a bolt can be under before it begins to deform. I am not sure how that exactly correlates to shackles though.
Proof Load on the Green Pin screw pin shackles is 2x WLL.
If my math is correct - the 8.5T rated 1-1/8" pin (1" bow) shackles will work:
WLL = 8.5x2204.6 = 18739 x2 = 37478 lbs proof load. Breaking load is 6x WLL, or 112,435lbs.
The next size up is a 9.5 tonne = 41887 lb proof load, 125,662lbs breaking load.
Thoughts?
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