Replacement and upgrade components for wafer fab equipment — such as quartz process tubes, electrostatic chucks, gas delivery manifolds, and robot end-effectors — are captured under SITC 72829 when they are dedicated to the machines covered by the semiconductor manufacturing equipment headings and are not specified elsewhere. Classification as a 'part' rather than a standalone machine requires demonstrating that the item has no independent commercial function outside the parent equipment. Because these components often carry the same BIS export control sensitivities as the machines they serve, end-use and end-user screening remains important even for spare parts transactions.

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