Concept

Ferrule

Summary
A ferrule (a corruption of Latin viriola "small bracelet", under the influence of ferrum "iron") is any of a number of types of objects, generally used for fastening, joining, sealing, or reinforcement. They are often narrow circular rings made from metal, or less commonly, plastic. Ferrules are also often referred to as eyelets or grommets within the manufacturing industry. Most ferrules consist of a circular clamp used to hold together and attach fibers, wires, or posts, generally by crimping, swaging, or otherwise deforming the ferrule to permanently tighten it onto the parts that it holds. Examples *The sleeve, usually plastic or metal, on the end of a shoelace, preventing it from unraveling (called the aglet) *The metal sleeve which is crimped to hold the eraser in place on a pencil *The metal band that binds the bristles or hair of a brush to its handle *The metal ring which holds a chisel blade's tang to its handle *In fiber optic terminations, glass or plastic fi
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