Oddball Metric Threads
Oddball Metric Threads
(OP)
I'm a QC Tech for a Communications Equipment Assembly plant here in Connecticut.
Today I had a visit from a Toolmaker, asking me for the tolerance range on an M29 x 1.5 thread.
Wouldn't ya know the Machinists Handbook skips right over the M29's!
I know the "29" represents 29mm Nominal, and the 1.5 represents the threads per revolution, but I can't come up with the tolerance ranges for the Major and Minor threads to save my life!!
Anyone know what the tolerance range is?
-Soupy1957
Today I had a visit from a Toolmaker, asking me for the tolerance range on an M29 x 1.5 thread.
Wouldn't ya know the Machinists Handbook skips right over the M29's!
I know the "29" represents 29mm Nominal, and the 1.5 represents the threads per revolution, but I can't come up with the tolerance ranges for the Major and Minor threads to save my life!!
Anyone know what the tolerance range is?
-Soupy1957





RE: Oddball Metric Threads
The 1.5 indicates the pitch of the thread, i.e. the linear distance between adjacent crests. M29 is a damned peculiar thread - not one of the standard ranges.
The following link might help you - I use it as a quick guide when there are no mechies to ask.
http://www.boltscience.com/pages/screw1.htm
The other link has some discussion of standard tolerancing
http://euler9.tripod.com/bolt-database/22.html
It lists
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