M1 mine

The M1, M1A1 and M4 are circular steel cased United States anti-tank blast mines with a distinctive cross shaped pressure spider. The mine was used during the Second World War and a copy produced in Argentina was used during the Falklands War. Another copy is produced in China. designated the No. 4 mine. Variants of the mine have also been deployed in Chad and Tunisia.

A cutaway showing the M4 mine in cross-section.
M1 mine

Downward pressure on the spider presses down on the head of the fuze, breaks a shear pin, and inverts a belleville spring, flipping the striker downwards into a stab sensitive detonator, triggering the mine. The M4 version of the mine has two secondary fuze wells so that anti-handling devices can be fitted.

Variants
  • M1 – the mine has two filler plugs on the top surface.
  • M1A1 – the mine has a single filler plug on the top surface.
  • M4 – as the M1A1 but with two secondary fuze wells, one on the side and one in the bottom.

Specifications
  • Weight: 4.80 kg
  • Explosive content: 2.70 kg of TNT
  • Height: 102 mm
  • Diameter: 203 mm
  • Operating pressure: 120 kg to 250 kg[1]

References
  1. U.S. LANDMINE, AT, HE, M1, M1A1 & M4, ORDATA, archived from the original on 2016-10-05, retrieved 2016-10-04


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