7/16" x 24 tpi male fully threaded steel nut - .550” long overall
SAE flare (45 degree/inverted/double)
Most popular size of American master cylinder nut.
Uses 7/16” wrench.
American thread master cylinder brake line nut for use with 3/16” OD tubing with SAE flare.
As the name implies, this is found most often at the master cylinder, but the A12-3 is also found on the back axle of some full size Ford trucks and other places.
Use with 3/16"/4.75mm (CNF-3) brake line