as sealing methods, and some dimensions of various parts. The drawing will also state the model rounds
in which this primer is assembled.
Refer to ammunition drawing 8881025. This drawing shows the detailed dimensions of the shell body
and the type filler by weight. It also gives marking instructions for placement on the shell body. The
table gives you the marking designation for various rounds with the same basic model numbers. The
notes give additional information about procedures for making stencil markings, masking procedures,
and the testing of obturating rings.
Refer to ammunition drawing 9205729. This drawing basically shows the fuze, PD, M524A6 assembly,
which is assembled to the M374A1 mortar round. It gives you additional drawing numbers which are
more in detail for each part of the fuze. The drawing will give you the outside dimensions of the fuze
positioning and dimensions of markings. The notes give the specification numbers and additional
information on assembly.
Refer to ammunition drawing 9233369. This drawing basically shows the M90A1 propellant increment
charges for the M374A1 81MM mortar cartridge. The only dimensions shown are the positioning of the
stitching at each end of the propellant bag. You must use drawing number 9233368 for more detailed
information. The notes show the specification numbers, type stitching and thread used, and propellant
weight. The drawing also lists additional drawing numbers for propellant increments for other models
of cartridges in the same series.
Refer to ammunition drawing 9233371. This drawing basically shows the charge B, M90E1 propellant
increment for the M374A1 81MM mortar cartridge. The drawing gives the increment bag dimensions
and hold down holes. The drawing 9233370 will be used for additional information about the increment
bag. The notes shows the specification numbers, type stitching, thread used, dimension and weight of
the propellant. The drawing also lists additional drawing numbers for propellant increments for other
models of cartridges in the series.
Refer to ammunition drawing 9233373. This drawing shows the cartridge, ignition, M66A1. It is
assembled the primer percussion, M71A2. Drawing 9235614, 8836348 and 8837349 must be used for
complete detailed information on the complete ignition cartridge. The drawing gives only the outside
dimensions of the ignition cartridge and tape requirements. The notes give you specification numbers,
type powder, tape requirements, marking, and type laquer information.
Refer to ammunition drawing 10520200. This drawing shows the fin assembly, M149 which is
assembled to the M374A1 mortar cartridge. Drawings 10520199, 7549029, and 7549028 must be used
for detailed information on the complete fin assembly. The drawing shows some dimensions of the fin
assembly, and the notes give you specification numbers, type thread sealing compound, and dimensions
for lot numbers and lettering.
By now, you should have a good idea of how to read ammunition drawings, and how to interpret the
information they contain. If you order ammunition drawings, you will receive them on microfilm cards
called aperture cards. You must have a special purpose machine capable of producing a hard copy
enlargement of the microfilm drawing.
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