M640 x 8 Diameters
M640 x 8 Diameters
(OP)
I am trying to find literature on large internal metric screw threads. Particularly M640 with a 8 pitch. Machinery's Handbook only goes up to 6 pitch for the tolerance grades 4 through 8.
What literature is out there that will provide the tolerances for a pitch 8, and the min/max for the major, minor, and pitch diameters.
What literature is out there that will provide the tolerances for a pitch 8, and the min/max for the major, minor, and pitch diameters.





RE: M640 x 8 Diameters
RE: M640 x 8 Diameters
Do you mean M64 instead of M640?
RE: M640 x 8 Diameters
The size that you want is outside of the scope of the published standard sizes. Luckily, ISO has a method to generate special thread sizes. Start out with ISO 68 to generate the basic thread dimensions and then use the formulas in ISO 965-1 to develop the tolerances for your thread. This should give you the information that you need to make your parts.
Dick