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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.
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 fibers are bonded to precision ferrule connectors (FCs), also described as fiber channel connectors, and polished for splitting or connecting two fibers together.
The metal spike at the end of the shaft of an ice axe
The margin of a cast crown that stabilizes root-canal-treated teeth in restorative dentistry
A ferrule, in respect to dentistry, is a band that encircles the external dimension of residual tooth structure, not unlike the metal bands that exist around a barrel. This is also known as the ferrule effect.
The bottom end of a flag stick on a golf course, which fits snugly into the hole in a cup
The plastic sleeve that adorns the bottom of a steel or graphite golf club shaft just above the club head hosel. Originally designed to protect the shaft from damaging vibrations, it is now used mainly for aesthetic purposes.
Official source
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