AN to Metric Adapter Fittings & Brake Adapter Fittings

Aluminum, steel, stainless steel, and brass fittings provide a robust and leak-free connection that will provide years of trouble-free service when correctly assembled and installed. This is especially important for brake adapter fittings, where a loss in pressure will result in brake failure, making high-quality fittings critical.

For those who are detail-oriented, decorative metric to AN adapter fittings are available in different finishes such as polished or anodized aluminum to complement the rest of your vehicle's plumbing and the car.

Metric threads are measured with a dial caliper from the outer edge of the thread on one side of the fitting to the external thread on the other side. 8mm, 10mm, 12mm, 14mm, and 16mm are standard thread diameter sizes. Thread pitch refers to the number of threads per millimeter and has to match for the fittings to thread into each other. This is measured by counting the number of "peaks" on the threading that fit within one millimeter. If the number of threads can't be determined within one millimeter, count the number in two or three millimeters and divide the count by the number of millimeters to get the correct answer. Examples include 1.0 (one thread per millimeter), 1.25, and 1.5.

There is a metric pipe thread in existence (pipe thread fittings do not use an O ring). However, they are not common in the US or in late-model vehicles. Many metric pipe thread fittings can be found in older non-automotive applications with components t made outside of the United States.

Metric adapter fittings are connectors that have metric threads on one end, either male or female. On the other end is a non-metric threaded end, also in male or female configuration. This adapter allows you to convert metric threads to a different thread design (such as AN or NPT, for example) and vice-versa.