wrench flats dimension question
wrench flats dimension question
(OP)
example:
machinist handbook shows max width across flats of nut... pick a 13/16 (.8125) nut and you have wrench opening of .818-.826. So I would call out wrench flats to be about .810 which is approx 13/16 which would have +-.005 on our part so wrench would fit ok... that's what I would do right now with my interpretation of the book...
is this a good way to do it? say if I pick a 5/32 wrench flat... then there is less between the max width of nut and minimum wrench opening --> so the handbook shows 5/32 nut to have a corresponding .158-.163 wrench opening. I would pick .151 +-.005 for wrench flats.... but this is much greater difference in comparison.... so maybe in this case one should pick .156 +.000-.005 for the flats?
thoughts? any general rules of thumb or maybe just a chart? if there is no chart or general rules- I was just going to make my own for every standard size. Thank you
machinist handbook shows max width across flats of nut... pick a 13/16 (.8125) nut and you have wrench opening of .818-.826. So I would call out wrench flats to be about .810 which is approx 13/16 which would have +-.005 on our part so wrench would fit ok... that's what I would do right now with my interpretation of the book...
is this a good way to do it? say if I pick a 5/32 wrench flat... then there is less between the max width of nut and minimum wrench opening --> so the handbook shows 5/32 nut to have a corresponding .158-.163 wrench opening. I would pick .151 +-.005 for wrench flats.... but this is much greater difference in comparison.... so maybe in this case one should pick .156 +.000-.005 for the flats?
thoughts? any general rules of thumb or maybe just a chart? if there is no chart or general rules- I was just going to make my own for every standard size. Thank you





RE: wrench flats dimension question
RE: wrench flats dimension question
So should one simply make every wrench flat dimension equal to the max nut dimension given in the handbook and have +.000 -.005? That would seem to work, but what makes sense?
RE: wrench flats dimension question
Ted
RE: wrench flats dimension question
What relationship to your "default" title block tolerances have to the functionality of nut and wrench dimensions? Apparently none.
Tolerances should be determined by functional requirements, not whatever happens to be in the standard title block.
Using the established dimensional limits for nuts that are known to work just fine with wrenches.
RE: wrench flats dimension question