The tolerances allowed for holes vary depending on the type of fit and _____________ in the assembly.

The correct answer, material, is significant because the properties and behavior of different materials influence how tolerances are established for holes in an assembly. Different materials can expand, contract, or deform under stress or temperature changes, which directly impacts how closely aligned holes must be for successful fit and function.

For example, in a metal assembly, the precision required for hole placement might differ significantly from that of a plastic assembly due to each material's different thermal expansion rates and structural integrity. A tighter tolerance might be permissible in a robust metal structure compared to a more flexible or brittle plastic one.

Understanding the specific material characteristics is crucial for ensuring that components fit correctly and perform as intended during operation, especially in aerospace applications where safety and reliability are paramount.