TM 10-5410-221-34P-1 column  in  lieu  of  a  quantity  indicates  that  no  specific quantity is applicable (e.g., shims, spacers, etc.). 4.  Special Information a.  Usable on codes are shown in the description column.      Uncoded   items   are   applicable   to   all   serial numbers.  Identification of the usable on codes used in this publication are: Code Used On A Serial No. 1 thru 184 B Serial No. 185 thru 302 b.    Detailed  manufacturing  instructions  for  items source   coded   to   be   manufactured   or   fabricated   are found in TM 10-5410-221-24. c.  Detailed assembly instructions for items source coded  to  be  assembled  are  found  in  TM  10-5410-221- 24.        Assembly    components    are    listed    immediately following the item to be assembled. d. The following publications pertain to Expandable Shelter and its components: TM 10-5410-221-10 Operator's Manual TM 10-5410-221-24 Organizational, Direct and General Support Mainte- nance Manual TM 10-5410-221-20P/1   Organizational Maintenance Repair Parts and Special Tools List 5.  How to Locate Repair Parts a.  When National Stock Number or Part Number is Unknown: (1)      First.      Using   the   table   of   contents, determine  the  functional  group,  within  which  the  repair part  belongs.    This  is  necessary  since  illustrations  are prepared  for  functional  groups,  and  listings  are  divided into the same groups. (2)    Second.    Find  the  illustration  covering the functional group to which the repair part belongs. (3)     Third.    Identify  the  repair  part  on  the illustration    and    note    the    illustration    figure    and    item number of the repair part. (4)   Fourth.  Using the Repair Parts Listing, find the figure and item number noted on the illustration. b.  When National Stock Number or Part Number is Known. (1)  First.  Using the Index of National Stock Numbers and Part Numbers, find the pertinent National stock    number    or    part    number.        This    index    is    in ascending   NSN   sequence   followed   by   a   list   of   part numbers   in   ascending   alphanumeric   sequence,   cross- referenced   to   the   illustration   figure   number   and   item number. (2)     Second.    After  finding  the  figure  and item  number,  locate  the  figure  and  item  number  in  the repair parts list. 6.  Abbreviations AL  ............................ Aluminum AMP ......................... Amperes ASSY ....................... Assembly AWG ........................ American wire gauge CD  ........................... Cadmium CRES   ...................... Corrosion resistance steel CSK  ......................... Countersunk DEG ......................... Degree DIA  .......................... Diameter EA   ........................... Each EXT  ......................... External FED  ......................... Federal FIL ............................ Fillister FLT  .......................... Flat FT ............................ Foot HD  ........................... Head HEX  ......................... Hexagon HZ   ........................... Hertz ID ............................. Inside Diameter IN ............................. Inches INTL ......................... Internal LH ............................ Left Hand LG   ........................... Long NF   ........................... National fine NO  ........................... Number OD  ........................... Outside Diameter P/N  .......................... Part number PLTD  ....................... Plated PVC  ......................... Polyvinyl chloride RD  ........................... Round 3