What is the acceptable actual length measurement for a spindle shaft specified at 1.5 feet?

The correct measurement for a spindle shaft specified at 1.5 feet is 1.49 feet. This choice is acceptable because it falls within a common tolerance range for manufacturing specifications, which often allows for slight variations from the nominal measurement.

Specifically, a shaft dimension of 1.5 feet allows for tolerances that consider factors such as material aging, manufacturing processes, and installation. The measurement of 1.49 feet is slightly under 1.5 feet but still acceptable, as it doesn't significantly deviate from the specified requirement and maintains the functional integrity of the spindle.

In contrast, the other measurements exceed the allowed tolerance or vary too much from the specified length, which could lead to issues such as poor fit or mechanical failure in practical applications.