What are the upper and lower limits of a part with a length of 8.5mm and tolerances of +0.05 and -0.02?

To determine the upper and lower limits of a part with a specified nominal length and tolerances, you need to add the upper tolerance to the nominal value to find the upper limit and subtract the lower tolerance from the nominal value to discover the lower limit.

In this case, the nominal length is 8.5 mm. The upper tolerance is +0.05 mm, and the lower tolerance is -0.02 mm.

Calculating the upper limit:

8.5 mm (nominal length) + 0.05 mm (upper tolerance) = 8.55 mm.

Calculating the lower limit:

8.5 mm (nominal length) - 0.02 mm (lower tolerance) = 8.48 mm.

Thus, the upper limit is 8.55 mm, and the lower limit is 8.48 mm, confirming that the correct answer is indeed the first option.

Options that state different ranges either misunderstand how to apply the tolerances or miscalculate the values altogether, leading to incorrect ranges that deviate from the standard mathematical operations used in determining tolerances.