A complete set of ammunition drawings for a single item of ammunition will contain a full graphic
representation about the item. Ammunition parts are normally made by different plants, and they must
be built to meet standards required by Military or Federal specifications. More than one ammunition
drawing is normally required to inspect an entire round or item. You will need ammunition drawings for
each of the following of a single item.
a. Method of loading provides information on the type of explosive filler or charge located in a
shell or projectile body, propelling charges, propulsion motors, fuzes, or any other parts that contain any
type of explosives or pyrotechnic material.
b. Method of assembly shows the manufactured parts fitted together as a whole.
c. Method of marking provides instructions on markings required on all items to include size,
placement, and color.
d. A list of specifications are included in all ammunition drawings for various parts or painting
materials. Specifications require a standard that must be met to comply with federal or military
specifications. The specifications are usually indicated by a specification number. When a specification
is revised, a letter is affixed to the basic number.
e. Lists of parts provides the name for each part of the specific assembly.
NOTE:
For the remaining portion of this lesson, the only ammunition drawings addressed will pertain
to the cartridge, 81MM: HE, M374A1w/Fuze, PD, M524A6. All ammunition drawings are
listed in the appendix located at the back of this subcourse. The ammunition drawings will be
referred to by drawing number and not by page number. These ammunition drawings will be
referred to in this lesson and also must be used for the Practice Exercise and the Examination.
Refer to ammunition drawing 9251984. This drawing shows the complete assembled round and lists
other pertinent drawing numbers for the separate assemblies that make the complete round. You will
have to pay close attention to these drawing numbers so you can inspect the complete round in detail.
As an example, drawing number 7549026 will give you detailed information about the increment holder.
You will also find notes listed that will give you detailed information on the procedures for assembling
various components, and specification numbers that apply. As an example, Drawing #9251984, "Note
5" states to coat threads of fin assembly with cement, Pettman type A, Spec Jan-C-99 and assemble to
meet 100 inch pounds disassembly torque. It also refers to Drawing #9251984 "Note 8" which states
alternative material; shellac composition is listed in drawing 9233504.
Refer to ammunition drawing 7549026. This drawing shows the detailed dimensions for the front and
rear increment holders that are assembled to the M374A1, 81MM mortar round. The notes lists the
specification numbers to be used when manufacturing the item. The table will give you the approximate
weight of each increment holder, its dimension, and the model numbers of other complete rounds to
which the increment holders are assembled.
Refer to ammunition drawing 7549173. This drawing shows some of the detailed dimensions and specifications
for the primer, percussion, M71A2. Basically the drawing gives you other drawing number to review for more
detailed information. The notes give you specification numbers for assembly procedures as well
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