6mm Brake Line Nuts

How to choose the right fittings for your tubing size.

Brake line fittings are measured by both their thread pitch and their I.D.(Inner diameter).

For example, although both the A12-3 and A2-4 nuts both have a thread pitch of 7/16” x 24, the A12-3’s I.D is 3/16”/4.75mm, while the A2-4’s I.D is 1/4".

The dash sizes indicate which size tubing that fitting will fit with.