Boss (engineering)

For instance, some motors use a precisely machined boss on the front face to locate it on the mating part.

Like a process on a bone, bosses on castings can provide attachment points or bearing surfaces.

The word 'boss' is also often used to describe the end of a shaft on a boat to which a propeller might attach.

[3] In computer-aided design applications, a boss is a feature used to describe a type of extrusion.

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