For a shaft measuring one inch in diameter with an RC6 sliding fit, what is the allowance?

In a sliding fit, the allowance refers to the intentional gap or space between two mating components, which allows them to move freely relative to each other. For an RC6 sliding fit, the standard for allowance reflects that the fit must have a certain degree of looseness to ensure that the components can slide without binding or creating too much friction.

For a shaft that is one inch in diameter with an RC6 sliding fit, the allowance is defined as a negative value, indicating that the diameter of the shaft should be slightly smaller than the corresponding hole. This enables the sliding motion between components.

In this case, the allowance of -0.003 inches makes sense because it is the specified value associated with the RC6 fit, ensuring the components are compatible while providing enough clearance. This slight reduction in size allows for efficient operation in scenarios where parts need to slide against each other without excessive wear or resistance.

The other options do not correctly represent the required clearance for an RC6 fit, as they suggest either no allowance or a tighter fit than is practical for the specified application. Thus, -0.003 inches is the appropriate allowance for this scenario.