I am designing some six-point flare nut wrenches. One of the goals is
to provide a wrench that is the least likely to round-off the corners on
soft flare nuts. I would like to know experienced mechanics' (not
necessarily professional) preferences on a couple design details.
1. Design detail #1 has to do with WHERE the slot is positioned.
There's two choices.
a. The slot is centered on one of the six corners of the hexagon, so
major portions of two of the six sides are removed. This is the design
currently produced by most major tool makers.
b. The slot is centered on the middle of one of the six sides of the
hexagon, with that entire side removed, plus minor portions of the two
adjacent sides. This design was common until 10 years ago, now mostly
replaced by design '"a."
2. Design detail #2 is whether the wrench is flank drive or not.
If you have used both types, what is your preference?