Ok I just got a drawing with an M67x2 thread (6g). I can't find any information on this in either the Machinery's Handbook or on the web so how in the world am I or anyone supposed to know how to build to this drawing? Is there something out there that can tell major diameter, pitch diameter, etc?
See if you can find anything here
http://www.mdmetric.com/
I will check some books that I have laying around in a bit. J
That's a BIG nut!
M67 X 2 = 67mm outside diameter and 2mm pitch. From the top of one thread to the top of the next is 2mm.
67mm = 2.6377 inches.
914Driver wrote: That's a BIG nut! M67 X 2 = 67mm outside diameter and 2mm pitch. From the top of one thread to the top of the next is 2mm. 67mm = 2.6377 inches.
I know that the M67 is OD maybe (I thought the 6G tolerance class would mean that it would be slightly under 67mm) and 2mm is the pitch but that doesn't give the pitch diameter or minor diameter.
In the same set of drawings there is a callout for a thread that says "2.063x1.588 Pitch UNS-2B (6H)". What the berkeley is this E36 M3? 
2B-6H is a class of fit.
http://www.engineersedge.com/thread_strength/thread_classes.htm
Go ask the engineer to fix his drawing?
So this is a thread thread? 
Also, doesn't the handbook have the formulas needed to calculate custom thread specs given the major dia, pitch, and fit? The most recent copy I have handy is an 11th from 1941, or I would look.
914Driver wrote: 2B-6H is a class of fit. http://www.engineersedge.com/thread_strength/thread_classes.htm
I thought 2B was a tolerance class for Imperial threads and 6H was for metric. I didn't know they could go together...
That's true, they don't.
2b is a class of fit, 6h is a class of fit. The long version is in metric the 6 is a tolerance grade and H is tolerance position.
I don't know how to copy & paste 54 pages, but if you google ASME B1.21M it will tell you all about metric threads.
Dan
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