If a product feature has a dimension of 1.8 ± .03, what is the lower tolerance dimension?

To determine the lower tolerance dimension of the product feature with a specified dimension of 1.8 ± 0.03, you subtract the tolerance from the nominal dimension.

With a nominal value (the target dimension) of 1.8, and the tolerance of 0.03, the lower tolerance is calculated as follows:

1.8 (nominal dimension) - 0.03 (tolerance) = 1.77.

This means that the smallest acceptable dimension for this feature, while still being within tolerances, is 1.77. Hence, the lower tolerance dimension is indeed 1.77.