A 1/4’’ aluminum sheet 4x8 that measures 4x8 means that the aluminum sheet is 1/4 inch thick, 4 feet long and 8 feet wide. This can be converted to centimeter units as 1 inch = 2.54 cm, so 1/4 inch = 6.35 mm. Therefore, a 1/4 inch aluminum sheet is 6.35 mm thick and measures 122 cm x 244 cm. This size of aluminum sheet is relatively large and is generally used in large scale engineering or manufacturing, such as for ships, aircraft, automobiles, and other industrial products that require high strength and corrosion resistance.

1/4’’ aluminum sheet 4x8 is usually available in the following common grades:
1. 6061 aluminum sheet: belongs to the 6000 series aluminum alloy, has excellent strength and corrosion resistance, commonly used in aerospace, shipbuilding, automotive parts and other fields.
2. 5052 aluminum sheet: belongs to the 5000 series aluminum alloy, has good processability and corrosion resistance, commonly used in shipbuilding, oil tanks, car body and other fields.
3. 7075 aluminum sheet: belongs to the 7000 series aluminum alloy, has very high strength and hardness, commonly used in aerospace field, high-strength structural parts manufacturing and so on.

The 1/4’’ aluminum sheet 4x8 is thicker and is suitable for projects that require higher strength. Common uses include the manufacture of hull structures for ships, fuselage components for airplanes, body parts for automobiles, and decorative materials for buildings. All of these grades of aluminum sheet have excellent properties and can meet the needs of various engineering projects.