ferrule

Short definition from Wiktionary

Noun

1. 1
   A band or cap (usually metal) placed around a shaft to reinforce it or to prevent splitting.
2. 2
   A band or cap (usually metal) placed around a shaft to reinforce it or to prevent splitting: The metal spike at the end of the shaft of an ice axe.
3. 3
   A band holding parts of an object together: A bushing for securing a pipe joint.
4. 4
   A band holding parts of an object together: A metal sleeve placed inside a gutter at the top.
5. 5
   A band holding parts of an object together: The plastic band attaching the tip to the cue.
6. 6
   A band holding parts of an object together: The pinched metal band which holds the bristles of a paintbrush or the eraser of a pencil to the shaft; a similar band crimped as part of a cable terminal or to terminate a hose.

Verb

1. 1
   To equip with a ferrule.