hread specification
 

thread specification
i am making a drawing that calls for .750-40uns thread. i would like to know what specification should i be referring to. i have looked at as8879 and ms7742...this size is not listed.
mil-s-8879
give it a look.
you can search mil stuff in this page:
thanx. i looked in the document but since i didn't find the appropriate thread size in any tables, i thought there was no provision for my thread size. there is in fact coverage in the notes area. thanx again
i would add a referenct to the thread callout to the note were the thread is further defined.
peter stockhausen
senior design analyst (checker)
infotech aerospace services
i would suggest asme b1.1-2003 unified inch threads is the most appropriate place to look.
there are some fairly detailed requirements on how uns (s is generally interpreted as special i.e. custom/non standard) threads are to be specified. fortunately this has come up before: