Thread: Tools?

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That's very interesting about the 19 mm wrench working on the 3/4" SAE nut. I must have tried it with a new wrench on a new nut but it is only about 0.002" undersize so if the 19 mm wrench is a little worn I guess it will work too. I'll have to try it just for the sake of trivia.

13/25.4 = 0.512 " (approx. for a loose fit to 0.500")

19/25.4 = 0.748" (approx. for a tight fit to 0.750")

Don Shillady

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"Life is hard. Life is harder when you are stupid!"

Well using the nice edit feature of this site maybe I can get beyond stupidity. Thinking back I guess I worked on 6 VW engines before getting back to "SAE-land" so I was thinking from the metric point of view. Allow me to correct the trivia above.

A 13 mm wrench will work on a 1/2" SAE nut (loosely), BUT
a 1/2"SAE wrench will NOT fit a 13 mm nut.

A 3/4" SAE wrench will certainly fit a 19 mm nut nicely (which is what you said), BUT a 19 mm wrench will be a tight fit (if at all) on a 3/4" SAE nut.

It also seems that the (19 mm / 3/4") interchange is closer to going both ways if the wrench is worn or the nuts are cold.

This is certainly of little practical value and one still needs both sets of wrenches, but I want to set the matter straight.

Don Shillady