Define the finish and substrate together
Black oxide is a finishing requirement, not a complete part specification. The drawing or purchase specification should identify the base material, the required finish standard or approved description, and any appearance or corrosion-related acceptance criteria. Suitability depends on the substrate and service environment and must be confirmed for the project.
See the site's surface finishing options for the broader finishing scope. This page focuses on what to define when requesting black oxide on a machined part.
Mark features that need special treatment
- Identify masked areas, contact surfaces, threads or bores with separate requirements.
- State dimensions that must be measured after finishing.
- Specify the required appearance and any test or documentation requirement.
- Call out other operations that must occur before or after the finish.
Do not assume that a finish name guarantees a particular corrosion result, thickness, color or dimensional change. Those outcomes depend on the selected specification and process. Confirm how the finish is accepted before approving the order.
Include finish details in a machining RFQ
Send the drawing revision, material, quantity, finish specification, masked areas and inspection requirements. Identify the delivery destination and whether the finish is supplied as part of the requested scope. We confirm the machining and finishing requirements for the actual part before quotation.
