Why state 5/8 UNC? This form is 11 tpi , not 14 tpi.
I don't understand what you are actually asking for? If it is 5/8" with a UNC form then I guess you mean 60 degree. This is also a metric form. M16 (close to 5/8") is a standard wheel nut size in various pitches.
As for 5/8 x 14tpi - never heard of such a thread apart from 5/8 x 14 BSP but then that is not 5/8" OD.
Not trying to teach granny to suck eggs . . . . just a few thoughts.
Cheers Carl.
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