Brake Lines

Tips for brake line install

Brake Line Thread Size Chart

An Size Metal Tube O.D. Thread Size
3 3/16″ 3/8″-24 SAE
4 1/4″ 7/16″-20 SAE
5 5/16″ 1/2″-20 SAE
6 3/8″ 9/16″-18 SAE
8 1/2″ 3/4″-16 SAE
10 5/8″ 7/8″-14 SAE
12 3/4″ 1-1/16″-12 SAE
16 1″ 1-5/16″12 SAE

 Brass Brake Line Adapters Chart

APM# Size – Insert Female Application – Male
3029 1/4″ tube 1/4″ tube (7/16″-24 thread)
3230 3/16″ tube 5/16″ tube (1/2″-20  thread)
3231 3/16″ tube 3/8″ tube (9/16″-20 thread)
3232 3/16″ tube 1/4″ tube (7/16″-24 thread)
3233 1/4″ tube 5/16″ tube (1/2″-20 thread)
3235 1/4″ tube 3/16″ tube (3/8″-24  thread)
3236 1/4″ tube 3/8″ tube (9/16″-18 thread)
3237 3/16″ tube 3/8″ tube (9/16″-18 thread)