Brake Line Fittings

Brake line fittings in the sizes that actually show up on a car: 3/16″, 1/4″, 5/16″ and 3/8″ tube, plus 6mm, 8mm and 10mm, in both metric and SAE thread. Metric threads run M9 through M18 including the DIN and long-thread variants, and SAE inverted flare runs 3/8-24 through 5/8-18, with stainless steel on several of the common sizes. Whether you are joining two sections of line, adapting a caliper or master cylinder to a different thread, or converting a factory metric fitting to a JIC-flared aftermarket line, this is the range to start from. Male and female halves are sold separately so you order exactly the thread you need on each end. The tube size in the listing is the line the fitting slides onto, not the thread it screws into, so check both before ordering.