What do the Different Lead Sizes Mean For Mechanical Pencils?
A mechanical pencil’s lead size refers to the diameter of the lead that the pencil writes with. The diameter of modern mechanical pencil lead is measured in mm.
The lead diameter of a mechanical pencil used to be measured in inches. When the pencil manufacturers converted to mm, this caused confusion as some manufacturers rounded up and others rounded down to the nearest mm for their labels and packaging.
This guide shows all the different lead sizes, what we use them for, and the manufacturers for each size.
So let’s dive in.