Originally Posted by
dedwards0323
A 7/16 wrench fits a hex size of 0.4375". An 11 mm wrench fits a hex size of 0.4331". The 11 mm wrench was too small to fit the brake line connection hex. Hard to believe that the hex flats being 0.0044" wider didn't allow the 11 mm wrench to fit. I had the same issue with the 9/16" hex on the OEM caliper hose connection. (Note: I'll re-emphasize that the caliper OEM hose connection is a fixed male fitting. The entire hose rotates as you unscrew this connection. It has to be disconnected after you disconnect the connection to the brake line.) The Goodridge SS brake line had a 7/16" hex flat on the hose connection to the caliper and was a slip fitting.
My 2007 Coupe has the Auto-Stick tranny.
This came from the Speed Bleeder site.
"Speed Bleeders are made from one of these four hex stock sizes...
1/4" hex, 5/16" hex, 3/8" hex, 7/16" hex This also applies to metric sizes. This means that metric wrenches will not work with Speed Bleeder even though it might have a metric sized thread. You have to use an inch wrench or SAE wrench size. The reason is that metric hex stock is not readily available at a reasonable price in this country."
So maybe this applies to the brake line hexagons as well.
Hexagonal nuts and bolts per ANSI standards have the max size across flats at the nominal size, so they are never bigger than the nominal size. Wrenches are always a bit bigger so they fit. Min and Max openings of ANSI standard 7/16" wrenches is .440"/.446".
A 11mm wrench should fit some 7/16" hex nuts, except combinations of nuts at the top of the tolerance size and using wrenches at the bottom of the tolerance size.
When dealing with Chinese nuts, bolts and wrenches all bets are off.