MIL-STD-1168C
Example:
A line is initially configured to produce 60mm propelling charges with lot number XYZ12A001-001. The line then is changed to produce 81mm propelling charges for lot XYZ12B010-001. To fulfill their schedule, the manufacturing activity switches back to 60mm propelling charges but increases to the next interfix and lot number XYZ12C002-001. To resume production of 81mm propelling charges, the interfix within that block of interfixes would also increase to lot number XYZ12D011-001.
c. If there are two, or more, separate production lines creating lots of the same item, then the lots shall have different interfix numbers assigned based upon the order of their production or in accordance with the "block of interfix numbers" procedure outlined in 4.4.3.1.
d. If the production line is of a configuration other than a number of operations performed in series (such as with some operations proceeding in parallel), then different interfixes may be required. The default shall be that product made on multiple distinct sections of the production lines requires different interfixes for traceability. If it can be shown that the resulting products from the different sections of the line are homogenous, then a request for use of a single interfix (see 4.4.6.3.1) may be submitted for approval (see 6.10.d). If there are any differences in processes or materials such that the resulting products will not be homogenous, then the lots of the same item shall have two different interfix numbers assigned based upon the order of their production or in accordance with the "block of interfix numbers" procedure outlined in 4.4.3.1.
4.4.6.3.1 Request for a single interfix. Requests for use of a single interfix shall not be approved if:
a. the resulting product would not be homogenous; Example:
A manufacturing activity uses two different cartridge case sources for
Loading, Assembling and Packing a 7.62mm small caliber round.
b. the different sections of the production line involve operations affecting critical defects;
Example:
A production line divides into parallel sections for loading propellant into mortar propelling charges. The charge weight is a critical defect and traceability would be lost if the products were combined under a single interfix.
c. the operations involve "special processes" such as welding, explosive melt pouring, or radiographic examination;
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