Custom Fabrication Solutions
We manufacture custom metal parts in Hangzhou, China, and coordinate surface finishing. Review the finish alongside the material, visible surfaces and assembly dimensions. We can discuss powder coating, painting, zinc treatments, brushing and polishing for your parts. We review anodizing and passivation by project.
Finish Selection
Choose a coating when the part needs a specified colour, gloss or texture. Powder coating is a common option for steel brackets and hardware. For powder coating or liquid painting, share your colour reference, expected exposure and any surfaces that need masking.
Zinc plating and galvanizing are options to review for steel parts and hardware. The process affects coating thickness, appearance and fit. Tell us whether your drawing calls for zinc plating, galvanized sheet or a coating applied after fabrication. Include any thread and cut-edge requirements.
Grain and sheen references
Brushing creates a directional grain on a visible metal face. Polishing can give a smoother or brighter appearance. Identify the faces to finish, the grain direction or target sheen, and how adjoining parts should match. Use a physical finish sample when appearance matters.
Aluminium hardware example for material review
We review these processes by project with our finishing partners. For anodized aluminium, specify the alloy, temper, appearance and any coating requirement. For stainless steel passivation, identify the grade and any required process or verification method. We confirm the applicable route with the drawing.
Material, Environment and Fit
| Part or requirement | Finish to review | What to check before approval |
|---|---|---|
| Steel bracket with a visible colour and texture | Powder coating or painting | The actual colour sample, gloss, exposure, edge coverage and surfaces that need masking. |
| Steel hardware with threads or narrow clearances | The specified zinc finish | The zinc process, layer requirements, thread fit and whether the part is coated before or after fabrication. |
| Stainless steel face that remains visible | Brushing or polishing | Grain direction, sheen, visible surfaces, weld blending where required and the sample used for comparison. |
| Aluminium part with a specified oxide finish | Anodizing, subject to project review | Alloy, temper, colour, appearance, contact marks and any thickness or sealing requirement. |
| Stainless steel part with a passivation requirement | Passivation, subject to project review | The stainless grade, required process, surface condition and verification criteria. |
Consider where the part will be used and how it will be handled or cleaned. A colour specification describes appearance. Corrosion protection also depends on the base material, preparation, finish system and service conditions. Put both requirements on the drawing when they matter.
Visible Face
Masked Thread
Mating Surface
Mark the visible faces and critical fits on your drawing.
Process Coordination
We review finishing requirements with the part geometry before fabrication. A visible weld may need agreed preparation before coating. A tapped hole, bearing seat or close-fitting slot may need masking or an allowance in the finished dimension. If two coated parts slide or bolt together, confirm the fit in the condition in which they will be delivered.
We coordinate the finish with partner factories using the agreed drawing and finish requirements. Where the order includes assembly, confirm whether hardware is fitted before or after finishing. Agree on how visible surfaces will be protected during packing.
Before You Order
Use the agreed colour reference, such as a RAL code where applicable, and specify gloss and texture separately. Mark which faces must match. For adjacent panels or visible hardware, approve a physical sample on the intended material and compare under agreed lighting conditions.
Zinc electroplating deposits zinc on a part. Galvanizing can refer to steel sheet coated before fabrication or to a fabricated steel part that is coated later. Specify which process you need and the applicable layer requirement. The choice affects the edges, appearance, thread fit and clearance.
Identify the surfaces where coating thickness matters. Mark threads, seats, contact faces and tight fits on the drawing. Coating can build up on both sides of an opening or interface. Agree which surfaces should be masked and which dimensions must be checked after finishing.
Anodizing forms an oxide layer on aluminium. Alloy and temper influence the finished appearance. Passivation is a treatment specified for stainless steel to remove free iron and support corrosion resistance. For either process, send the grade and any required acceptance criteria so we can confirm the applicable route with a finishing partner.
State the test method, specimen condition and pass criteria when you request a quote. For salt spray testing, identify the required exposure time and what should be assessed after exposure. For adhesion, specify the method and acceptance criteria. We review the test scope and available documentation for the exact material and finish system.
Cost depends on the material, preparation, part geometry, finish, masking, quantity and any agreed testing or protective packing. When comparing offers, use the same drawing revision, physical finish reference and inspection requirements.
Sample Approval
For a repeat order, agree which sample or reference defines the finish. Check colour, sheen and texture on the visible faces. Check critical dimensions and movement on the finished part, especially around threads, slots and mating faces. Keep the finish reference and packing requirements with the approved drawing.
Send Your Requirements
Share your technical drawing, specified material grade, required quantity, and desired surface finish. If applicable, provide a color reference or physical sample for accuracy. Clearly identify cosmetic surfaces, areas to be masked, and critical dimensions that must be maintained post-finishing. Additionally, specify any required testing protocols or specialized packaging instructions as part of your request.
