Oddball Metric Threads

[soupy1957]

I'm a QC Tech for a Communications Assembly Facility here in Connecticut.
Today I had a visit from a Toolmaker, asking me for the tolerances on an M29 x 1.5 thread.
Wouldn't ya know the Machinists Handbook skips right over the M29's!!
I realize that M29 is the definer of the Nominal (29mm) and the 1.5 represents the threads per revolution, but what are the tolerance ranges for the Major and Minor threads I haven't a clue.......
Someone got an answer?

-Soupy1957

 

[CezarAndrei]

nope, 1.5 means the pitch.
angle is 60°.

for tolerancing there are classes.

check the following links:

http://www.tapmatic.com/tech_manual/class_of_threads.html

http://mdmetric.com/tech/threadtech.pdf

http://www.roymech.co.uk/Useful_Tables/Drawing/draw_dim.html

http://www.engineersedge.com/thread_strength/thread_classes.htm

cezar
guelph, on

 

[CezarAndrei]

btw, major is considered the max. diameter.
eg. for a bolt of M6X1, the major is 6mm, so M29X1.5, the major is 29. Minor you can calculate. The angle is 60°

Good luck

 

[soupy1957]

Thanks for the help............
-Soupy1957