Mark a finish map
Identify cosmetic faces, sealing faces, threaded features, contact areas and masked zones on the drawing. A single color or finish name does not tell the finishing partner which surfaces must be protected.
MATERIAL PURCHASING & PROCESS GUIDE
Material & Surface Finish Compatibility
Connect the substrate to the finish specification and the delivered dimensions. OUJI coordinates finishing through specialist partners; the exact grade, geometry and acceptance requirement determine the route.
SPECIFICATION REFERENCE
Choose a finish route with its conditions.
This matrix is a review aid, not blanket approval for every alloy and coating. Use it to identify which finish, surface map and inspection stage belong in the RFQ.
| Substrate | Route to review | Condition that changes the order | Finished-part acceptance | Reference / next step |
|---|---|---|---|---|
| Aluminum | Anodizing, including hard anodizing where specified | Alloy and temper, process/type, color, thickness, sealing and masking; appearance varies by alloy | Mark fits and cosmetic surfaces accepted after treatment; do not use one universal allowance | Aluminum Anodizers Council (opens in a new tab) |
| Stainless steel | Passivation | Exact grade, treatment specification and required verification; passivation is not a decorative plated layer | Define cleanliness and surface acceptance separately from dimensional inspection | ASTM A967/A967M scope (opens in a new tab) |
| Steel | Drawing-specified protective finish | Name the coating and thickness; identify threads, bores and areas to mask | State whether the final fit is measured after coating and whether a coating report is required | OUJI finishing review |
| Brass or copper | Specified plated or as-machined surface | Identify the substrate alloy, coating stack and contact faces that must remain exposed | Separate cosmetic appearance from conductivity or other functional acceptance tests | OUJI finishing review |
| PMMA or polycarbonate | Machined appearance / selected optical finishing | Specify the polymer formulation, viewing faces, internal access and approved cleaning exposure | Use a defined visual or optical criterion; a clear stock name does not establish a polished result | Acrylic surface requirements |
| PEEK, POM, nylon or PTFE | As-machined finish; special treatment by formulation review | Do not transfer a metal finishing specification to a polymer; define functional surfaces and conditioning | Inspect dimensions in the agreed material and temperature condition | Ensinger machining guidance (opens in a new tab) |
Accept the dimension after the final operation
If a fitted bore is specified after coating, make that inspection stage explicit. Coating growth, pretreatment and any later machining must be considered together; this page does not prescribe a universal thickness compensation.
Use the published sequence as evidence
OUJI’s selective-machining-after-black-anodizing project documents one operation sequence. Its scope does not establish the alloy or finish behavior of a different part. Review the original case and specify the new drawing’s protected areas.
RFQ example: identify the substrate and condition; name the finish specification; mark masking and cosmetic faces; highlight all dimensions that apply after finishing.
DRAWING TO QUOTATION
Have a material on your drawing?
Send the drawing and quantity. We’ll review the material, machining route, finish and inspection requirements together.
Response within 24 hours of receiving complete project details.
Start with what you have.
Open the full request form ↗Details already in your drawing do not need to be repeated. If a material is undecided, tell us what the part needs to do.
See our inspection approach ↗