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. They measure the diameter of all modern mechanical pencils in mm.
The lead diameter of a mechanical pencil used to be measured in inches and 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.
In this guide, we show all the different lead sizes, what we use them for, and the manufacturers for each size.
So let’s dive in.