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To calculate the outside diameter of a steel coil, you first need to determine the inside diameter (ID) and the thickness of the steel material. The outside diameter (OD) can then be calculated using the formula: OD = ID + 2 × thickness. If the coil is wound in layers, you may also need to account for the number of layers by adding the thickness multiplied by the number of layers to the ID.
A vernier caliper should be used to measure the diameter of a steel ball.
8 "
13mm diameter & 3100 length pl. give me weight
Area = 1/4*Pi*d2 = 0.25*3.14*162(256)= about 200.963ft2