When measuring an outside diameter with calipers, which reading should be considered?

When measuring the outside diameter with calipers, the largest reading should be considered because it accounts for any variations or tolerances in the part being measured. It is common for objects to have slight irregularities due to manufacturing processes, which can cause the diameter to fluctuate. By identifying the maximum reading, you ensure that you are capturing the full extent of the diameter, which is particularly important in applications where the fit of the part is crucial, such as in mechanical assemblies.

Using the largest reading can help in achieving compliance with specifications and ensuring the correct fit within its intended use. This approach is especially critical in fields that require precise engagements, such as mechanical engineering, where even minor deviations can have significant implications.