The Nib Guide

Sizes, grinds, flex, and fixes — the part of the pen that decides everything.

Every fountain pen question eventually becomes a nib question. Size sets your line; grind sets its character; tuning decides whether the whole instrument sings or scratches. This hub collects the sizing translations (Japanese F ≈ Western EF), the grind footprints, and the ten-minute fixes that rescue most "bad" pens.