USA Vehicle Armour Hardness

USA Vehicle Armour Hardness

Armour Type	Year of Specification	Armour BHN for Plate Thicknesses (in mm) of:									FH BHN
Armour Type	Year of Specification	6–13	22–31	32–38	51	64	76	102–127	128–152	152 or more	FH BHN
RHA [1]	1942 (or 1941?) to 1945	320–390	310–350	280–320	260–290	240–275	240–260		220		?
Cast [1]	1940 to 1941	n/a	363–440	235–270		n/a	280	n/a			n/a
Cast [1]	1942 (or 1943?) to 1945	302–325		235–269			235–260	220–250		200	n/a

Footnotes

1. It was determined reliably that a large proportion of USA armour, both RHA and cast, produced prior to November 1943 was flawed to such an extent that it resisted about 5% to 50% less than it should have, with a mean resistance around 85% of 1944 and 1945 armour plate. [up]

2. Source: Robert Livingston. Robert derived his information from a paper available on microfilm at the Patton Museum (curator Charles Lemons). [up]

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