TM 55-4920-227-15
undersize is stated in the description. These
be requisitioned for immediate use only from the next
parts are not index numbered nor is a
higher maintenance category.
required quantity shown.
j. Figure and Index Numbers. When applicable,
(3) When details of an assembly are shown on
numbers which appear in the last right-hand column of
another text page, the description of that
each text page reference items contained in the text to
assembly is followed by a notation stating
the proper part on the appropriate illustration. This
where those details can be located.
enables ready reference from illustration to text and from
Example: "47-620-600-13 Transmission
text to illustration. When a breakdown cover both left-
Assembly. See figure 24 for breakdown."
and right-hand assemblies, only the left-hand parts are
The parts that make up the Transmission
indexed and illustrated.
Assembly will be found on the text listing for
4. Abbreviations
(4) Attaching parts are listed immediately after
The following abbreviations are used:
the part(s) they attach and in the same
DEG...........Degrees(s)
indent. They are separated from the part(s)
DIA ............Diameter(s)
by the words "Attaching Parts." When they
EA .............EACH
attach an assembly, which is broken down
FT..............Foot (Feet)
to show detail parts, the attaching parts are
HEX...........Hexagon(al)
separated from the details of the assembly
HP .............Horsepower
by the symbol ". . . * . . .". Details of the
ID...............Inside Diameter(s)
assembly are then indented one indent to
IN...............Inch(es)
the right of their next assembly, which
LG .............Length (long)
appears above the attaching part.
MFG ..........Manufacturing
(5) Part Numbers.
Three basically different
MTG ..........Mounting(s)
kinds of part numbers are found within this
NC .............American National Coarse Thread
column.
NEMA ........National Electrical Manufacturers
(a) Identification of manufacturer, e.g.,
Association
27391.
NF .............American National Fine Thread
(b) Government standard or Military part
NO.............Number(s)
numbers which begin with the letters
OD.............Outside Diameter(s)
AN, AF, MS, NAF, NAS, etc.
P/N ............Part Number
Miscellaneous vendor part numbers
RD .............Round
have no particular type.
RPM ..........Revolutions per Minute
(c) Commercial parts which have no
SQ .............Square
manufacturer's part number, the symbol
THK ...........Thick(ness)
COML appears in the description
V ...............Volt(s)
column.
g. Unit of Issue. This column lists the standard or
5. Explanation of Terminology
minimum basic quantity in which the item is issued
Requisition (Stock Number). When an item has
(each, pound, set, etc.).
been replaced by a modified or improved item, the
h. Expendability Code.
When an item is
replacing item will be requisitioned; the issuing agency
nonexpendable it will be indicated by an N. This column
will issue the replaced item until all stocks are exhausted
will be left blank for all items which are expendable.
before issuing the replacing item.
i. Quantity Authorized.
An asterisk (*) code
contained within the quantity authorized column
6. How to Find a Part
indicates that the item is authorized for use at that level,
a. When Part Number Is Known. Locate the part
but is not authorized to be stocked, assembled, or
number in the Alpha-Numerical Part Number Index,
manufactured. When such an item is required, it must
AGO 6729A
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