MIL-STD-1168C
4.7.5.3 Hybrid lot identification and documentation. Once a hybrid lot is authorized and produced, it shall be numbered in accordance with the provisions of this standard. A hybrid lot shall be identified by replacing the hyphen between the lot series number and the lot sequence number in the ammunition lot number with a capital letter "H." Other pertinent, identifying, and authorization information shall be placed in the remarks block of the ADC. When formation of a hybrid lot is approved, it shall retain the same interfix number and simply be assigned the next higher lot sequence number than that of the last regular lot produced as shown in the following example.
Example:
A manufacturing activity has produced 37 lots in the "004" interfix series of a particular item of assembly. The last lot interfix number of this production is YYY97K004-037. The manufacturing activity finds they have a large amount of components remaining which are from an assortment of manufacturing activities and metal parts lot numbers. Throughout the production of the "004" interfix series the product had been conforming to the TDP requirements, contractually accepted, and had no quality problems noted. The manufacturing activity submits a request for variance and requests permission to produce a "hybrid lot" with a quantity of 8,127 units. Upon receiving approval, they produce a "hybrid lot" consisting of 8,127 units. The lot is numbered as YYY97L004H038.
4.7.5.4 Multiple hybrid lots. Occasionally more than one (1) hybrid lot would be formed within an interfix. In such instances, the lot sequence number would progress in the usual manner - YYY97M004H039, YYY98A004H040, etc. Year of production and month of production would progress as appropriate.
4.7.6 Master calibration component lots and master calibration lots. (The "C" lots.) Non-propellant component or end item lots approved as master calibration lots shall be identified by replacing the hyphen between the lot interfix number and the lot sequence number with a capital "C." Propellant lots approved as master calibration lots shall be identified by replacing the character immediately after the hyphen in the propellant lot number with a capital letter "C." The updated lot number with the lot identifier code shall be applied directly to the ADC and all appropriate controlling documents. Any detailed comments shall be made in the remarks block of the ADC. As a minimum, the revised lot number shall be marked on all external packages or cartons, and if necessary, applied directly to the individual units for identification purposes (see
6.13). Upon selection of a lot to be a calibration lot, the manufacturing activity shall be notified of the selection (see 6.13). Where only a portion of a lot is approved as a calibration lot, then only those units shall be marked appropriately. Ammunition designated as calibration lots shall not be issued for field use nor flow into the regular supply stream without special and specific authorization.
4.7.7 Reference lots. (The "R" lots.) These lots pertain to the reference lots for: ammunition up to and including .50 caliber; reference standard component lots and items of issue lots above .50 caliber; and reference propellant lots. Component or end item lots
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