MIL-STD-1168C
or whatever progressions are considered feasible based on procurement, contractual, and production projections. Examples of this process are provided in 4.4.5.1.1 and
4.4.5.1.3.3. Within the designated blocks of interfixes, the interfix numbers shall still be assigned sequentially.
4.4.4 Actions requiring changes in interfix numbers. Under certain conditions, changes to the contract may require a change in interfix number. Changes in design, manufacturing processes, material, production methods, certain administrative procedures, suppliers, etc., shall require a change in the interfix number. For all lots
produced after the altered conditions, the interfix number shall index to the next available interfix number or the next assigned interfix number if blocks of interfixes are being
used. Interfix numbers may be changed for reasons other than those noted herein when it is considered necessary (see 6.10.g and 6.10.h). Each reason for changing interfix numbers shall be stated in the remarks block of the data cards for the first lot of the new interfix. The reasons for requiring changes in interfixes can be divided into two categories: administrative purposes and technical reasons. The occurrences necessitating changes in interfix numbers are described by category in 4.4.5 and 4.4.6.
4.4.5 Changes in interfix for administrative purposes.
4.4.5.1 Different interfix numbers. Lot interfix numbers shall be different:
a. for similar items (see 3.2.15), or for items which may be confused with one another, made or assembled by the same manufacturing activity at the same location,
b. for different items which are of the same caliber or size, or
c. for situations where it is determined to be in the best interests of the
Government.
Even if there are differences in Department of Defense Identification Codes (DODICs), Naval Ammunition Logistics Code (NALC), NSNs, nomenclature, or model numbers, the above rules still apply. If the items can visually or logistically be confused, then the interfixes shall be different. An example of items that can be logistically confused is if
the items have the same basic model number even though they do not look alike (ex. M67 propelling charges vs. an M67 hand grenade). Note: A basic model number is the model number not including any modifiers such as "Al" or "El" etc.
4.4.5.1.1 Concurrent manufacturing. If a manufacturing activity is concurrently manufacturing or loading several similar items at the same facility, then each item shall have distinct interfix numbers. This shall be accomplished by assigning "blocks of interfix numbers" to each of the specific items considered as "items of a similar nature." This may be accomplished as illustrated in the following examples:
Example 1:
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