Swaged eyelet

Vertical caving terminology and methods > Knots > Alternatives and enhancements to knots

Swaged eyelet, crimped eyelet, eyelet, ferrule

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Spreader with three swaged eyelets. Each swaged eyelet has a thimble, and a protective plastic covering over the ferrule.

A loop at the end of a cable, used on an electron ladder, spreader or wire trace. The wire is folded back on itself to create the loop. A metal sleeve called a ferrule is placed over the ends of the loop, and crimped onto the wires using a swaging tool, holding the two ends in place. A thimble is usually placed on the inside edge of the loop. The ferrule must be made of specific, soft metals, depending on what the cable is made from. Aluminium, copper or zinc plated copper ferrules are normally considered suitable for galvanised steel cables, with aluminium being the weakest option. Tin plated copper ferrules are normally considered suitable for stainless steel cables. However, it is important to check the recommendations for the specific cable being used. When done correctly, a swaged eyelet retains about 90-96% of the minimum breaking strength of the wire.


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