20 lb. AN-M4120, 23 lb. Clusters, Cluster Adapter
U.S.N.B.D. - UNITED STATES - BOMBS AND FUZES; PYROTECHNICS
SECTION I - HIGH EXPLOSIVE BOMBS
PART IV - U.S. ARMY-NAVY "AN" SERIES BOMBS

DATA:

23 lbs.

ARMY-NAVY BOMBS

 

AN-M 40 & M72

23 LB. PARA-FRAG.

OVERALL LENGTH

26.7 in.  

BODY LENGTH

11.3 in.  

BODY DIAMETER

3.6 in.  

WALL THICKNESS

0.56 in.  

AN-M40 (23 lb.) and A1 Mod

TAIL LENGHT

13.9 in.  

M72 (23 lb.) and A1 Mod

TAIL WIDTH

4.35 in.    

TAIL WEIGHT

5.3 in.    
       
       

WEIGHTS:

 

 

     

Type of Filling

T.N.T.    

Weight of Filling

2.7 lbs.    

Total Weight

24.5 lbs.    

Chg/Wt. Ratio

11.0%

 

 

FUZING:

AN-M120A1; AN-M104; M170; AN-M120

BODY CONSTRUCTION:

These bombs are constructed of the following: (1) cast steel nose and tail pie-ces; (2) seamless steel inner tube; (3) helically-wrapped drawn steel wire wrapping around inner tube. The tube is threaded to hold the nose and tail sections.

SUSPENSIONS:

For individual suspension of these bombs, a U-shaped eyebolt of steel is welded to bomb at the center of gravity.

The AN-M40 bombs are always clustered, three of the bomb with the AN-M3 cluster adapter forming the AN-M4 cluster.

The M72 slightly modified version of the AN-M40, is adapted for individual verti-cal suspension and can be carried in vertical cellular racks by several types of Army planes.

TAIL CONSTRUCTIONS:

AN-M40 and M72 are fitted with cylindrical sheet parachute housings which have end caps at the rear and contain a white silk parachute. The parachute unit M3 is used in the M40 and M71 bombs; the M4 parachute unit is used in the M72 and M73 bombs.

COLOR AND MARKINGS:

Oilve drab with a 1" yellow band around the nose and extreme rear of the bomb and a 1/4" band around the center of gravity. Present production eliminates the 1/4" yellow band.

REMARKS:

The M71 and M73 are practice bombs.

The AN-M40 and M72 are low-level fragmentation bombs and should be dropped from a maximum altitude of 400 ft.

The A1 modification of these bombs consists of adding a 1 1/2" shoulder around the nose of the bomb to facilitate with unfuzed bombs. Heretofore the spacers of the cluster adapters have fitted against the fuze, thereby making it requisite that the bombs are clustered and shipped with the fuzes inserted. Bombs with this modi-fication are designated the AN-M41A1 and M72A1 fragmentation bombs with the practice bombs being designated M71A1 and M73A1.

20 lb. AN-M4120, 23 lb. Clusters, Cluster Adapter