TM 9-6115-658-13&P C-7 3. Hardness Critical Item (HCI).  A support item that provides the equipment with special protection from electromagnetic pulse (EMP) damage during a nuclear attack. 4. The statement END OF FIGURE appears just below the last item description in column (6) for a given figure in both the repair parts list and special tools list. QTY (Column (7)).  The QTY (quantity per figure) column indicates the quantity of the item used in the breakout shown on the illustration/figure, which is prepared for a functional group, subfunctional group, or an assembly.  A "V" appearing in this column instead of a quantity indicates that the quantity is variable and quantity may change from application to application. C-4  EXPLANATION OF CROSS-REFERENCE INDEXES AND COLUMNS (Section IV). 1.  National Stock Number (NSN) Index. STOCK NUMBER Column. This column lists the NSN in National identification number (NIIN) sequence.  The NIIN consists of the last nine digits of the NSN. NSN     When using this column to locate an (e.g., 5385-01-574-1476) item, ignore the first four digits of NIIN      the NSN.  However, the complete NSN should be used when ordering items by stock number. FIG. Column.  This column lists the number of the figure where the item is identified/located.  The figures are in numerical order in the repair parts list and special tools list. ITEM Column.  The item number identifies the item associated with the figure listed in the adjacent FIG. Column.   This item is also identified by the NSN listed on the same line. 2.  Part Number (P/N) Index.  P/Ns in this index are listed by in ascending alphanumeric sequence (vertical arrangement of letter and number combinations which places the first letter or digit of each group in order A through Z, followed by the numbers 0 through 9 and each following letter or digit in like order). CAGEC Column.  The Commercial and Government Entity Code (CAGEC) is used to identify the manufacturer, distributor, or Government agency, etc., that supplies the item. PART NUMBER Column.  Indicates the P/N assigned to the item. STOCK NUMBER Column.  This column lists the NSN for the item. FIG. Column.  This column lists the number of the figure where the item is identified/located in the repair parts list and special tools list. ITEM Column.  The item number is the number assigned to the item as it appears in the figure referenced in the adjacent figure number column. 3.  Figure Number and Item Number Indexes. FIG. Column.  This column lists the number of the figure where the item is identified/located in the repair parts list and special tools list. ITEM column.  The item number is that number assigned to the item as it appears in the figure referenced in the adjacent figure number column. STOCK NUMBER Column.  This column lists the NSN for the item. CAGEC Column.  The Commercial and Government Entity Code (CAGEC) is used to identify the manufacturer, distributor, or Government agency, etc., that supplies the item. PART NUMBER Column.  Indicates the P/N assigned to the item.