USNBD, Bombs and Fuzes; Section III - Bomb Fuzes: M163, M164, M165

U.S.N.B.D. - UNITED STATES - BOMBS AND FUZES; PYROTECHNICS

SECTION III - BOMB FUZES

DATA:		U.S. ARMY FUZES
		M163, M164, M165
BOMBS USED IN	All G.P. bombs except Mk 4
	Mod 4
	AN-Mk 17 325 lb. Depth
	AN-Mk 54 350 lb. Depth
	M82 90 lb. Frag.
	M81 260 lb. Frag.
	AN-M88 220 lb. Frag.	MECHANICAL IMPACT
	AN-M76 500 lb. Incend.
	AN-M78 500 lb. Chem.
	AN-M79 1000 lb. Chem.
	AN-M58 500 lb. S.A.P.
	AN-M59 1000 lb. S.A.P.
FUNCTIONING:
M163	Instantaneous; .1 second delay
M164	Instantaneous; .01 second delay
M165	Instantaneous; .025 second delay
FUZES USED WITH:
	M160, M161 or M162 normally; AN-M100A2 series

ARMING DATA
	Vane Revolutions	Air Travel (Ft.)	Min. Vert. Drop @ 200 mph
Instantaneous Settings		1710-3625	1775 ft.
Delay Settings		1140-2420	915 ft.

VANE SPAN:	6" (2 vanes)
MAX. BODY DIAMETER	2.7"
MATERIAL	Cadmium plated steel with some brass parts.

GENERAL:

The M163, M164, and M165 mechanical impact nose fuzes correspond to the AN-M103A1, AN-M139A1, and the AN-M140A1 respectively except for the arming screw of the M165 series which has 32 single threads per inch as against 14 single threads to the inch in the earlier fuzes. Although the length of the M165 arming screw is reduced to .5 in., the crash proof feature is retained in the new series by the addition of a se-cond shoulder higher up on the arming stem which bears against the bottom of the ar-ming screw.

This series of fuzes is designed as a companion group for the M160, M161 and M162 and serves to eliminate the same difficulties discussed on page 154 with reference to the M160 series.

To distinguish the new series from their prototype, the following markings are em-ployed; the top of the M163 vane cup is painted completely yellow, and in the M164 and M165 the vane cup is painted yellow except for the black sections indicating the delays.

OPERATION:

The operation is similar to that of the AN-M103A1 series except for incorporation of a longer arming time in the M163 series; see page 159.

REMARKS:

These fuzes are not being procured by the Navy.