As-machined & bead-blasted
Machining marks may remain on an as-machined face. Blasting creates a more even matte appearance but needs protection of sensitive interfaces.
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Define the surface and protect the fit
Connect appearance, functional surfaces and final-condition inspection in one finishing brief.
Define appearance references, protected interfaces and inspection after the specified finish.
PROCESS · PARTS · PROJECT DETAILS
Choose the finish around the surface function
Compare appearance, protection and dimensional effects before selecting a finish. A colour reference alone does not define the full requirement.
Anodized aluminum
Define grade, colour reference, visible surfaces and masking. Alloy and pretreatment can change the final appearance.
Coated sheet-metal parts
Identify cosmetic surfaces, grounding contacts, threads and fits before powder coating or painting.
Project reference
| Functional requirements | Specify the finish, required coating thickness and protected mating faces. |
|---|---|
| Acceptance reference | Agree a physical sample, viewing conditions and drawing notes. |
PRACTICAL ENGINEERING
Separate appearance, protection and fit
A colour name alone cannot define a complete finishing requirement.
CONCEPT ONLY · NO DIMENSIONS OR MEASURED DATA
- Cosmetic surface
- Mark visible faces and agree texture, colour and permitted contact marks.
- Functional interface
- Identify threads, locating fits and electrical contacts needing protection or masking.
- Final size
- State whether acceptance dimensions apply before or after finishing.
PRACTICAL ENGINEERING
Four finishing discussions for aluminum parts
The route and subcontracted scope are confirmed per project.
| Option | Purpose / appearance | What to agree |
|---|---|---|
| As-machined + deburred | Retains machining texture where a coating is not specified. | Functional roughness, edge breaks and permitted machining marks. |
| Bead-blasted texture | Creates a matte texture; blasting itself is not an anodic coating. | Texture reference, protected fits and the following treatment, if any. |
| Clear / colour anodizing | An aluminum surface-treatment option for appearance and protection. | Alloy, colour sample, specification, masking and contact locations. |
| Hard anodizing | A function-led option to review when wear resistance is required. | Required standard, thickness, fit allowance and acceptance condition. |
PRACTICAL ENGINEERING
Write a masking plan around the assembly
Use drawing marks or an annotated model to identify the protected regions.
FEATURE REVIEW
Identify the interfaces that must remain functional
Use the drawing to identify the inner diameter, mounting holes and designated faces requiring control after finishing.
- Inner diameter and mating faces
- Holes, threads and protected areas
- Approved appearance reference
| Area | Question to resolve | Useful input |
|---|---|---|
| Locating bores / pins | Does the finished size still meet the intended fit? | Fit callout, masking boundary and post-finish inspection requirement. |
| Threads | How will effective engagement and gauge acceptance be maintained? | Thread specification, masking or agreed allowance and final check. |
| Electrical contact faces | Which regions must retain the required contact condition? | Defined contact area and the applicable functional acceptance requirement. |
| Cosmetic faces | Where are fixture or rack contact marks acceptable? | Visible-face identification and approved sample/contact locations. |
PRACTICAL ENGINEERING
Approve the effect before the batch
Screen colour is a communication aid; the agreed sample and specification define acceptance.
- 01Approved reference
Define the reference
Agree alloy/condition, surface preparation, colour/texture reference and cosmetic faces.
- 02Interface boundaries
Review the interfaces
Mark masking, contact locations and dimensions that must be checked in the finished condition.
- 03Batch baseline
Confirm the batch baseline
Record the accepted sample or specification and any inspection or protective-packing requirement.
PRACTICAL ENGINEERING
Finishing questions
Clarify the process rather than selecting solely by a photograph.
Does a black part mean hard anodizing?
No. Colour alone does not identify the process, thickness or functional performance. State the required treatment and specification.
Will finishing remove every machining mark?
Do not assume that. Surface preparation and the chosen finish influence the visible texture; agree an appropriate sample.
Are all finishes completed at the factory?
Some finishing is coordinated with external suppliers. The project scope defines the process split, inspection and acceptance responsibilities.
PRACTICAL ENGINEERING
Bring the finish into the enquiry
Add the sample reference, masking regions and final-fit requirements in the project message.
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