HomeFUZES and IGNITERSUnited States

Text copied from TM-43-0001-36, 1994


Type Classification
:
C 6558 (LCC-S)

Use:
Fuze, Mine, Combination, M10 and M10A1 are used to activate the M8 antipersonnel practice mine. M10A2 is used to activate the M8A1 antipersonnel practice mine.



Description:
The M10 series fuzes are of the combination type with a three-pronged pressure firing device at the top and a pull wire release pin ring at the side. The fuze body houses a spring-loaded firing pin and a cocking mechanism. The base contains a primer and either a length of safety fuze or a delay composition charge. The firing mechanism consists of a cylindrical metal case containing a trigger pin, a release pin, and a firing pin, each fitted with a coil spring. Two safety pins render the fuze safe during shipment and handling. A cotter pin passes through the end of the release pin and bears against the body of the fuze. A second pin, called the safety firing pin, passes through the end of the firing pin that protrudes above the top of the fuze. The fuze igniter assemblies (primers, safety fuses, delays, black powder, or smoke charges) are replaceable. The fuzes may be used many times by replacing the fired igniter assembly and recocking the firing mechanism. All models are packed with the appropriate M8 mine models. The M10A1 fuze is also packed for separate issue.

Difference between models.
Fuzes M10 and M10A1 use a primer to fire a delay safety fuse which ignites 15 grains of black powder. The M10 and M10A1 fuzes are interchangeable; their principal difference being in the primer. The M39A1 primer used with the M10A1 fuze provides more reliable functioning than the MK5 primer used with the M10 fuze. The M10A2 fuze uses the M39A1 primer and two delay composition elements to ignite a 725 mg smoke charge.

Functioning:
The firing mechanism is activated by a force of 8 to 20 pounds on any of the prongs or a pull of 3 to 10 pounds on the release pin. Either type of action will cause the firing pin to strike the primer which initiates the delay elements. After 4 to 5 seconds these set off the igniter charge which, in turn, initiates the mine explosive train.

Tabulated Data:
Model numbers ......................M10, M10A1,
M10A2
Type ................................Mechanical combination
Drawings:
Assembly:
M10 ..............................73-9-25
M10A1..........................73-9-25
M10A2..........................8866643
Weight ................................Approximately 6 oz
Dimensions:
Height (incl prongs) ...........6.875 in.
Maximum diameter............1.103 in.
Material ................................Zinc alloy
Thread ................................0.563-12UNC-1A