Chain and shackles
Posted: Wed Jul 23, 2008 4:43 pm
What size chain and shackles should I use for recovery
Also I am assuming it must be HT steel is this correct
Also I am assuming it must be HT steel is this correct
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Shackles I would not recommend anything smaller than a 3/4" Bow shackles. I don't think it needs to be HT. Is there a particular reason why you want to use chain in stead of straps?Tristan wrote:What size chain and shackles should I use for recovery
Also I am assuming it must be HT steel is this correct
Ian, DO NOT USE A COMMERCIAL SHACKLE FOR RECOVERY!!!!!!!
Here is why(and to add what has already been said).
RATED Bow and D-shackles of the same size, have the same load rating.
Commercial D-shackles are a very different story. Commercial D-shackles have much lower load rating and this is the main reason why "experts" always tell us to use Bow shackles as you cannot get it mixed up. Because of this, it has become a myth that D-shackles are weaker than Bow shackles.....and I bet you many of the so-called "experts" don't even know this.
Any rigging expert will tell you the main idea behind the Bow shackle is to distribute the load on the eye of a webbing strap.
Here are some shackle load ratings from a Haggie Rand catalogue. Size given as pin diameter.
Crosby Greenpin, Safety factor 5.4/1. Work Load Limit permanently shown on shackle. Load rating the same for D and Bow shackles.
16mm - 3.25 Ton
20mm - 4.75 Ton
22mm - 6.5 Ton
Galvanised Large D Shackles, stamped with rating.
(Safety factor not given)
16mm - 1.5 Ton
20mm - 2.0 Ton
22mm - 3.0 Ton
Commercial D Shackle, galvanised, untested body & pin
(As these are untested, the load ratings are stated as approximate values)
16mm - 0.8 Ton
20mm - 1.1 Ton
22mm - 1.5 Ton
Note the massive difference between the proper rated shackle and the commercial shackle!!!