# Annular

> From: LOCTITE®X Digital Manual for Bonding (https://www.loctitex.com/en/manuals/bonding/id-qttYoI7X/)

###### Annular

![Annular](/en/manuals/bonding/assets/img/bondline-calculation-annular-gap.jpg)

Di = inner diameter

Do = outer diameter

Volume = (π (Do2 - Di2) /4) x bondline gap