What is the maximum acceptable value if a specification diagram lists it as 47 ± 4?

When a specification is given as 47 ± 4, it indicates a range around the nominal value of 47. The ± 4 means you can add or subtract 4 from 47 to determine the acceptable limits of that specification.

To find the maximum acceptable value, you add the value of 4 to the nominal number, which is done as follows:

Maximum acceptable value = 47 + 4 = 51.

This means that any value up to and including 51 would be acceptable according to the given specification. The other values mentioned do not reach this upper limit of 51 and therefore would not be considered the maximum acceptable value in this context.