【转帖】dimension a screw

yang686526

dimension a screw
i am trying to call out a screw spec. on a drawing. it is a m4 x 0.7 screw. is there any other spec. to a screw other than the "m4 x 0.7" callout. what happened was the supplier sent us the screws as per the m4 x 0.7. but it failed our testing gages because they were a different "d" spec. i checked on various drafting standards. i could not find anymore information about a "d" spec. for screws. i would appreciate if anybody can give me soem information about this. thank you.
yes,
i cannot speak for the rest of the world but in europe in the automotive trade it is normal to specify a din or iso number to cover things like material, tolerance and finish/ coating.
even if none of these matter, length is normal.
these might help.
you might also want to consider using a nas, ms, or an spec to control your mechanical hardware.  although, the per piece price will increase some industries mandate that type of control.
best regards,
heckler
sr. mechanical engineer
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