The unusual feature of this ammunition is a "fragmentation piece," or segmented metal cylinder
filled with TNT. The detonation of the shell is intended to break up the cylinder into small
squares, thereby augmenting the antipersonnel effect. The shell body is of carbon steel, probably
of low tensile strength, and is punched and drawn with a solid base, and the cavity is
machined. There is a single copper rotating band. The nose, fuze adapter, and fragmentation
piece are machined castings in gray cast-iron.
The shell may be identified by its specially processed gray surface
with a 15-mm (.58-inch) light blue band, 20 mm (.79 inch)
forward of the rotating band. An examination of the shell produces the following descriptive data:
Weight of shell body | | 6.98 lb | |
Length of shell body | | 7.97 in |
Weight of nose fuze adaptor | | 1.87 lb | |
Length of nose fuze adaptor | | 2.16 in |
Weight of fragmentation piece | | 3.85 lb | |
Length of fragmentation piece | | 6.46 in |
Total weight (unfilled, unfuzed) | | 12.7 lb | |
Length of shell, unfuzed | | 9.25 in |
Length of shell in rear of Rotating band 1.48 in |