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Both internal and external threads can be formed by MIM; however, tapping internal threads is usually more precise and cost effective than using unscrewing cores. The optimum location for external threads is on a parting line of mold members to eliminate the need for unscrewing the mold members that form them. To hold a thread tolerance on a thread diameter, narrow flats—typically .005”—at the parting line are generally specified, as shown in Figure 7. This insures proper mold seal-off, reduces the likelihood of a parting-line vestige, and eliminates problems with flash in the root of the threads, thus reducing mold maintenance.