British Official Armour Specification


The British Official Armour Specification is a set of standards for armour construction for armoured fighting vehicles, including tanks, during the late Interwar Period and into World [War II].

Standards list

Standards applicable to British List of [World War II tanks|tanks of World War II] are as follows:I.T.60: Face-hardened 7 to 12 mm steel plate.I.T.70: Thin homogeneous hard 3 to 30 mm plate.I.T.80: Thick homogeneous-machineable 15 mm and greater plate.I.T.90: Cast armour of all thicknesses.I.T.100: Thin homogeneous-machineable 3 to 14 mm plate.I.T.110: Carbon manganese steel backing plate.

Resources

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