British Official Armour Specification
- British Official Armour Specification
The British Official Armour Specification is a set of standards for armour construction for armoured fighting vehicles prior to and into World War II.
Standards applicable to British tanks of World War II are as follows:
* I.T.60: Face-hardened 7 to 12 mm 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.
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