castle nut

noun

1. castellated nut.

castle nut

noun

1. a hexagonal nut with six slots in the head, two of which take a locking pin to hold it firmly in position

Word History and Origins

Origin of castle nut¹

First recorded in 1900–05

Example Sentences

Underneath, you'll find a little castle nut that you'll remove.

From Time Magazine Archive

Making sure that the bearings are sitting properly and not bound up, put the top dust seal back in place and then thread the castle nut onto the steering stem.

From Time Magazine Archive

Tighten the castle nut as tight as you can get it with your hand and a rag.

From Time Magazine Archive

This can be fine-tuned by either tightening or loosening the castle nut.

From Time Magazine Archive

Remove the castle nut and dust seal, and then drop the bottom clamp out of the frame.

From Time Magazine Archive