SB 742-1
b. Gaging during these inspections (other than IRI) should
AMMUNITION CARTRIDGE, 75MM, BLANK M337
be limited to individual rounds showing evidence of damage or
SERIES
other conditions that may preclude loading or firing. Unless
the rounds requiring gaging are truly representative of the lot
being inspected, they should not be used to evaluate the lot.
Results, however, should be annotated on the DSR with the
a. DODIC: 1315-C025
reason for gaging.
b. Ammunition Type:
Cartridge, 75MM, Blank, M337
c. Table AD-1 identifies test and measurement equipment.
Series.
a. Inspection category:
category Y (three years), blank
No unique safety precautions are applicable to this item.
b. The sampling plan for inspection is according to
a. All IRI samples will be gaged using a profile and chapter 2.
alignment gage. Gaging is not normally required during RI, PI
or UBLI.
Item will be inspected according to chapter 2 and table AD-2.
Description
NSN
Application
Inspection
Gage, profile and
Cartridge, M337A2
IRI, RI, PI, UBLI
alignment
Gage, profile and
Cartridge Brass case,
IRI, RI, PI, UBLI
alignment
M337A1
Classification
Application
Inspection
Inspection
Method
Description
1. Critical:
a. Primer above flush
All
Visual; Straight Edge
2. Major:
a. Primer loose
All
Visual/Manual
b. Closing Cup cracked, broken, punctured or malformed
All
Visual
c. Closing Cup Seal not continuous or groove not filled with
All
Visual
cement
d. Closing Cup Air escape hole not filled with cement
All
Visual
e. Cartridge case crack or split extending through sidewall or
All
Visual
bottom
f. Chamber gage failure
All
Gage
3. Minor:
a. Glue or asphalt on exterior of cartridge
All
Visual
b. Missing Protective Finish
M337A2
Visual
a. See drawing 7549273. Primer parts must not protrude
beyond rear face of cartridge case.
b. See drawing 7549273. Assure seal and air escape hole
are completely filled with resin cement. Any excess cement
should be removed from exterior of cartridge case.
c. Cracks or splits in cartridge case may expose black
powder filler to moisture that could cause accelerated
degradation of performance.
d. Gaging is required only during IRI or if visual inspection
is questionable.
e. See drawing 7549273.
Wax emulsion is required for
aluminum cartridge cases.
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