ZINC OR RESIN POURED SOCKET TYPE TERMINATIONS

Wire Rope Slings

ZINC OR RESIN POURED SOCKET TYPE TERMINATIONS 

While some people may debate whether zinc or resin poured sockets are truly slings, they are generally included in the sling category. This type of termination has traditionally been the method for determining the rope’s actual breaking strength. All other types of end terminations have been compared to poured sockets. Their efficiency is therefore established to be 100% for all grades and constructions of rope.

Choker hitches are not used as much with poured sockets as with the other more general types of slings. When such slings are used in a choker hitch, the rated capacity adjustment Table 1 applies.

Rope assemblies with poured attachments are generally used as a straight tension member where the rope body does not contact the load and is otherwise kept free from distortion or physical abuse. In such cases the minimum recommended design factor is 3.0. If the assembly is used as a sling then a design factor of 5.0 should be used to calculate the rated capacity. Rated capacities for these slings used in basket hitches are the same as mechanical spliced slings and use the same D/d ratio factors.

Length tolerances for poured attachments can be somewhat more stringent than other types of slings. The manufacturer should be contacted and agreement reached before the order is placed. Tolerance as small as plus or minus 1/8” is not out of the ordinary for this type of assembly. Specifications such as type of fitting, pin orientation, whether zinc or resin is to be used and type of application should also be supplied to the manufacturer when ordering these types of assemblies. Those inexperienced in the socketing process should not try to fabricate assemblies without first getting expert training. It is far better to leave fabrication of this type of assembly to the experts. The following socketing methods are general in nature and have withstood the test of time. Slight variations to these methods will produce equal results. The two procedures, while achieving the same end result, differ significantly. It is highly recommended that all poured sockets whether they be zinc or resin, be proofloaded.