Originally Posted by
onehundred80
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.
So this tells me that the 11 mm wrench should have worked on the flats of the Crossfire brake line connection. Now my metric wrenches in this size range are not the highest quality, since I don't have routine and/or heavy needs in this size range. But the 11 mm wrench I have definitely would not fit the hex flat. Interesting!
And when I installed the Speed Bleeder screws, the 8 mm wrench fit the hex flats! Interesting!