huangyhg

metric screw thread callout
hi all, new memeber.
have a question on how to dimension a screw thread. it's metric, 16mm with a pitch of 1.0mm. need to tap a hole with this type of thread. am using the ansi y14.5m-1994.
all i can find in my references are a minumum nominal size, threads per inch, thread form and thread class. i'm used to calling out fractional threads as .250-20 unc-2b. what is the format for calling out metric threads with these parameters?
thanks in advance.
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m16x1 7h could be an example for the tapped hole; 7h being the tolerance, it can be different, it depends on the tolerance of the bolt and fit you need.
look in the machinery handbook for more info.
gearguru is correct.
do a google search to find more info.
also...fyi, it's asme y14.5m-1994, not ansi. and it doesn't have thread info.
chris
sr. mechanical designer, cad
solidworks 05 sp3.1 / pdmworks 05
truckpoor-
go to machinery's handbook for this information. if you don't have one you should consider getting one.
tyou could try the maryland metrics webpage. they have good data there. i trust you can find their website.
tunalover
okay, thanks. don't know why i had such a problem. i've called out metric threads before, just couldn't find any of my old drawings. brain fart...
i have a bright and shiny brand new machinists handbook sitting on the floor of my office. i always forget about that thing because i try to use y14.5 exclusively. machinist's handbook is a reference only thing for me.
thanks again. looks like a pretty informative forum. i'll be checking back often.
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