Heat treatment, EDM, grinding and polishing, anodizing, plating, and laser marking, arranged by us in-house or through managed partners in Dongguan. You send one drawing, get one quote, and every part comes back to our shop for a second inspection before it ships.
Most rejected finished parts were machined to the nominal size and then coated or hardened. We cut for what the next process will do, so the part is in tolerance at the end, not before finishing.
| Process | What it does to the part | What we do about it |
|---|---|---|
| Hard anodizeup to 50 µm | Grows about half outward and half into the metal. Bores get smaller and threads get tighter. | Critical bores and threads cut with coating allowance. Threads plugged or masked where the drawing allows. |
| Nickel platingthickness to drawing | Adds thickness on every surface, and more on sharp edges. | Fits sized for the specified thickness and measured again after plating. |
| Vacuum hardening, quench and temperHRC to drawing | Parts can move and distort as they harden. | Grinding stock left on critical faces and bores, then ground to size after hardening. |
| QPQblack, wear resistant | Small growth and very little distortion. | Used when steel parts need wear and corrosion resistance without regrinding. Sizes checked after treatment. |
| Wire EDM after hardeningno cutting force | Cuts hardened steel without distortion. | Sharp internal corners, narrow slots, and hardened profiles cut after heat treatment. |
| Polishing and grindingRa to drawing | Removes material from the surface. | Allowance agreed at review, Ra and size confirmed after. |
Wear and corrosion resistance for automation fixtures, with no regrinding.
Sharp internal corners and narrow slots in hardened steel, cut after heat treatment.
Clear, black, and colors, plus hard anodize up to 50 µm.
Fits sized for the plating thickness, measured again after.
Racked so contact marks land on non-functional faces.
Machined faces and edges polished back to clear.
Put the process, hardness or thickness, color, and any masking on the drawing. If a combination will not work on your part, we tell you at drawing review, before the price.
| Process | Aluminum | Steel | Stainless | Brass, copper | Plastics | Typical use |
|---|---|---|---|---|---|---|
| Heat treatment | ||||||
| Vacuum hardening | – | ● | ● | ● | – | Hardness to drawing, low scale |
| Quench and temper | – | ● | – | – | – | Target HRC for shafts and tooling |
| Carburizing | – | ● | – | – | – | Hard case, tough core |
| Nitriding | – | ● | ● | – | – | Wear surface, low distortion |
| QPQ | – | ● | – | – | – | Black, wear and corrosion resistant |
| Stress relief / annealing | ● | ● | ● | ● | – | Stability before finish machining |
| EDM | ||||||
| Wire EDM | ● | ● | ● | ● | – | Profiles, slots, sharp inside corners |
| Sinker EDM | – | ● | ● | – | – | Blind cavities and deep pockets |
| Grinding and polishing | ||||||
| Grinding | – | ● | ● | – | – | Size and flatness after hardening |
| Polishing | ● | ● | ● | ● | ● | Ra to drawing, cosmetic faces |
| Flame polishing | – | – | – | – | ● | Clear PC and acrylic back to clear |
| Surface finishing | ||||||
| Anodizing, clear and colors | ● | – | – | – | – | Corrosion protection, color |
| Hard anodize, up to 50 µm | ● | – | – | – | – | Wear surface, insulation |
| Nickel plating | ● | ● | – | ● | – | Corrosion, conductivity, look |
| Zinc plating | – | ● | – | – | – | Corrosion protection for steel |
| Black oxide | – | ● | – | – | – | Dark finish for tooling parts |
| Passivation | – | – | ● | – | – | Restores stainless corrosion resistance |
| Electropolishing | – | – | ● | – | – | Smooth, cleanable stainless |
| Bead blasting | ● | ● | ● | ● | – | Even matte texture |
| Marking | ||||||
| Laser marking | ● | ● | ● | ● | ● | Part numbers, logos, QR, batch IDs |
Yes. You send one drawing with the finish and hardness callouts. We machine the part, arrange heat treatment, EDM, grinding, coating, and marking in-house or through managed partners in Dongguan, inspect the parts again when they come back, and ship them as one order.
We plan for the coating at drawing review. Critical bores, shafts, and threads are cut with allowance for the specified thickness, for example for hard anodize up to 50 µm, and threads are plugged or masked where the drawing allows. Fits and threads are measured again after finishing.
Vacuum hardening, quench and temper, carburizing, nitriding, QPQ, and stress relief, with hardness to your drawing. Where hardening can distort the part, we leave grinding stock and grind critical faces and bores to size afterwards.
Yes. Wire EDM cuts profiles, narrow slots, and sharp internal corners, including in hardened steel after heat treatment. Sinker EDM is used for blind cavities and deep pockets. The achievable tolerance is confirmed per feature at drawing review.
Yes. Part numbers, revision letters, logos, QR or data matrix codes, and batch IDs, on metals, anodized surfaces, and most plastics. Show the location, size, and content on the drawing.
Drawing review with manufacturability feedback in the quote, including coating and hardening risks, a free first-article inspection report, and our remake guarantee: parts that do not meet your drawing are remade at our cost, with freight paid both ways. We reply by email within 24 hours and on WhatsApp within 12 hours.
Send the drawing with the finish spec. You get DFM feedback with the quote and a free first-article report on your first order. Email reply within 24 hours, WhatsApp within 12 hours.
Send Drawing with Finish Spec