We supply a long time customer with a few different sizes of this same type of special hex nut in steel zinc.  Their application requires plastic molding that requires minimal or no chamfer on the hex nuts used in order to keep the plastic material from flowing into critical parts of the assembly.  Since large quantities (over 1MM pieces) are involved we work with our long time trusted factory in Taiwan to manufacture the parts.  We then stock approximately 12 months' usage at a time and release to our customer on as-needed basis.