X- Y- H- half hinges

Mil Spec half hinge terminology
The "X" type half hinge has no knuckles on either end.
The "Y" type half hinge has knuckles on both ends.
The "H" type half hinge has a knuckle on one end, no knuckle on the other.
The "X" type half hinge has no knuckles on either end.
The "Y" type half hinge has knuckles on both ends.
The "H" type half hinge has a knuckle on one end, no knuckle on the other.
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