The alloy in the T651 state is stretched on the basis of the T6 state to eliminate the internal stress and thus is more suitable for forming. Specification of 6063 Aluminum Coil : Grade. 6063. Temper. All available, H1X, H2X, H3X, O, HXXX. Coil ID. 75mm, 150mm, 200mm, 300mm, 400mm, 508mm or negotiable. Coil OD.