MIL-STD-1168C
A manufacturing activity (manufacturer's identification symbol "XYZ") producing three (3) similar bomb tail fuzes (M800 series, M801 series, and M802 series) should have interfix numbers assigned in accordance with the following:
At the start of production, the M800 series would be assigned the "block of interfix numbers" from "001" to "009"; the M801 items, block "010" through "019"; and the M802 bomb tail fuzes, interfix numbers "020" through "029." The initial production lot number for the M800 would be XYZ12H001-001. The
"001" interfix series shall continue until an approved engineering change order or some other factor requires a change from the "001" interfix. The next interfix number for the M800 production would be "002" and the initial lot produced reflecting the change would be XYZ12L002-001, then XYZ12M002-002 and so on through XYZ13J009-001, XYZ13K009-002, XYZ13L009-003, etc.
The first lot of M801 bomb tail fuzes shall be numbered XYZ12J010-001, XYZ12K010-002 and so on through XYZ13K019-001, XYZ13L019-002, XYZ13M019-003, etc.
The first lot of the M802 series shall be numbered XYZ12K020-001, XYZ12K020-002 and so on through XYZ13D029-001, XYZ13D029-002, XYZ13E029-003, etc.
The first group to exhaust its block of interfix numbers would proceed to the next logical progression.
Example 2:
The M801 bomb tail fuze production reaches lot number XYZ13M019-003. A change in interfix number is now required. This group would then be assigned a block of interfix numbers from "030" to "039." As a result, the next lot of M801 fuzes produced will have a lot number XYZ14A030-001. Also, primers, detonators, bursters, etc., produced at the same facility may be assigned the same interfix number as long as the basic model numbers are different in each case.
4.4.5.1.2 Development. When a development category (XM) model number is standardized, the next lot produced as the standardized model shall be assigned the next higher sequential interfix number. The last sequence number shall again revert to "001."
Example:
Fuze, XM302 with lot number NNN97H002-004 is re-designated as fuze, M302. The next production lot of the now standardized model shall be numbered NNN97J003-001.
4.4.5.1.3 Same size or caliber items. Whenever items of the same size or caliber are being manufactured or assembled by the same manufacturing activity at the same facility, all such items shall be assigned different blocks of interfix numbers. In these instances, blocks of interfix numbers shall be assigned in the order that production or
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