Dowel Pin定位销

What it is

A dowel pin is a short, precisely sized cylinder pressed or slip-fitted into holes. In fidgets it aligns layers, guides a slider plate or stops travel at the end.

Why it matters

Pins are small but decide precision. A well-sized pin keeps plates from wobbling; a worn or undersized one adds slop and rattle.

Also known as: Locating Pin, Guide Pin, 销钉.