Nuts and bolts. SAE, Metric, or both
I been wrenching on vehicles all my life. It use to be only SAE, then it became a mix of SAE and Metric. I thought they we're going to phase out SAE and go all metric at some point, but it seems like ...
Forum Discussion
fj12ryder wrote:Better check your math, it's wrong.
FWIW, 9/16" is .5625, 14mm is .551, that's .010" difference.
A 9/16 hex head can be 0.541 to 0.562 (tolerance is such that they're smaller than nominal). A 14 mm hex head from .534-.551 (I think, I could only find a JIS B1180 reference and none for DIN or ISO).
So, it's certainly possible for a tight fitting 14 mm wrench/socket to not fit on a 9/16 head. Conversely, a 9/16 tool could be a very sloppy fit on a 14 mm fastener.
