DOC KSM-001 · REV C · CUSTOM CNC MACHINING
Machined to print. Proven by inspection.
King Sun Machining is an ISO 9001:2015 job shop in Dongguan, China — 3/4/5-axis milling, CNC turning and Swiss machining in 30+ materials, from a single prototype to a 10,000-piece production run. Every shipment leaves with a CMM report against your drawing.
TOL ±0.005 MM· 30+ MATERIALS· MOQ 1 PC· QUOTES < 24 H
What the shop floor can do.
One building, one quality system, every common process under one roof. That matters because parts don't move between vendors — tolerances stack, accountability doesn't split, and your quote reflects one shop's real capacity, not a broker's markup.
FLOOR INVENTORY — 12 MILLS · 7 LATHES · 2 SWISS · 2 CMMs
CNC Milling — 3 / 4 / 5-Axis
Envelope to 700 × 500 × 450 mm with tombstone and pallet options for production lots. Complex 5-axis contours in one setup, so datums don't drift between operations.
CNC Turning + Live Tool
Bar feed Ø6–80 mm with driven tools for cross-drilling and milling in-cycle. Parts come off complete rather than bouncing back to a mill for one slot.
Swiss-Type Machining
For parts that are small, long, or both — Ø0.5–20 mm with tolerances that conventional lathes can't hold at length. Watch-style parts, pins, nozzles, dental components.
Finishing & Treatment
Anodize Type II/III in stock and custom colors, bead blast, passivation, black oxide, zinc and electroless nickel plating — managed end-to-end with certified partners.
Inspection Lab
Two CMMs, surface roughness testers, and a gauge crib that's actually calibrated. First articles follow an AS9102-style report; production ships with full dimensional data.
How smooth does it need to be?
Every step down the Ra ladder costs money — grinding what standard milling already delivered is the most common invisible markup in machining. Drag the slider across the standard Ra series and see what each grade actually looks like, and which process it demands.
The rule of thumb: specify only what touches something.
Sealing faces, bearing journals and bores earn tight finish callouts. Everything else is usually fine at Ra 3.2 — the default a good shop holds anyway. Calling Ra 0.8 on a bracket is paying grinding prices for cosmetic confidence.
When in doubt, mark the function on the drawing instead of the number — our engineers will propose the cheapest process that satisfies it.
Materials, on the shelf.
Bars, plates and rods in certified stock from audited mills — which is why prototypes can start within 24 hours of drawing approval.
| Material | Common alloys | Notes from the floor | Typical finishing |
|---|---|---|---|
| AluminumAL | 6061-T6 · 7075-T6 · 2024 · 5052 · 6063 | The default answer. Fast to cut, cheap, anodizes beautifully. 7075 for strength, 6061 for everything else. | Anodize II/III, bead blast, clear/chrome |
| StainlessSS | 304 · 316L · 17-4PH · 303 | 316L for anything medical or marine; 17-4PH when it must also be strong. 303 when you're tired of fighting work hardening. | Passivate, bead blast, electropolish |
| Carbon SteelCS | 1045 · 4140 · A36 · 12L14 | Workhorse shafts and brackets. 4140 pre-hard for gears and pins without the heat-treat queue. | Black oxide, zinc, QPQ nitride |
| Brass & CopperCU | C360 · C260 · C110 · C101 | Free-machining C360 is a joy on the Swiss. Copper for bus bars and thermal paths — expect burr patience. | Clear/tin/nickel plate, natural lacquer |
| TitaniumTI | Gr2 · Gr5 (Ti-6Al-4V) | Aerospace and medical favorite. Slow to cut, worth it — and we run coated toolpaths tuned for it. | Bead blast, anodize (color), passivate |
| Engineering PlasticsPL | POM/Delrin · Nylon · PEEK · PTFE · HDPE · ABS · PC | POM for gears and bushings; PEEK when it must survive autoclaves and lawyers alike. | As-machined, vapor polish (PC), tumbling |
| Other MetalsXX | Inconel 718 · Magnesium AZ31 · Zinc alloys | Sourced per-project with mill certs. Talk to engineering before quoting exotic lot sizes. | Per alloy — ask |
MATERIAL CERTS (EN 10204 3.1), ROHS AND REACH DECLARATIONS AVAILABLE ON REQUEST · UNLISTED ALLOYS SOURCED WITH FULL TRACEABILITY
A part's journey, on the record.
Every job runs on a routing card like this one — real example from a current flanged-shaft order. You see the same sheet we do, with the same QC gates.
Drawings we see every week.
Housings, brackets, spacers — AS9102-style FAI and full traceability as standard.
Surgical instrument components and enclosures in 316L and titanium, cleaned and documented.
One-off fixtures to 1,000-piece actuator runs; repeatable bores and mounting faces.
Prototypes and low-volume legacy parts that OEM supply chains refuse to quote.
Anodized aluminum cosmetic parts where finish quality is the product.
4140 shafts, stainless fittings, Inconel hot-section bits sourced per project.
Notes from the shop floor.
Asked before every first order.
The six questions every new buyer sends. Yours not here — ask it directly, an engineer answers.
Ask an EngineerSTEP and IGES are ideal, but we quote from SolidWorks, Fusion, DWG/DXF and 2D PDF drawings too. Send whatever you have — even a marked-up screenshot — and we confirm assumptions in writing before quoting, so the price is for the part you meant.
No MOQ. One prototype and 10,000 production parts get the same quote desk, the same machines and the same inspection report — the only thing that changes is the per-piece price.
±0.005 mm is standard machining precision on our mills and lathes; grinding and Swiss operations can hold tighter. Anything unusual gets flagged on the quote with the process we'll use to hit it — before you commit, not after.
Quotes within 24 hours on business days. Prototypes in 5–7 days after drawing approval, production lots in 2–3 weeks, with expedite slots available when a line is down somewhere and someone is having a bad week.
Worldwide, via DHL, FedEx or consolidated sea freight for production volumes. DDP shipping with duties handled is available to most destinations in the US and EU — your customs broker can have the week off.
Every shipment includes a full CMM dimensional report against your drawing. First articles follow an AS9102-style FAI, and material certificates plus RoHS/REACH declarations are available on request at no charge.
Send the drawing. Get a number.
Quotes within 24 hours on business days, from engineers who read the drawing — not a form that forgets to ask about your thread callout.
- 24 hours to a firm quote, materials and lead time included.
- DFM feedback free — if a fillet saves you 30%, you'll hear it from us first.
- NDA on request, signed same-day. Your drawings stay your drawings.
- DDP shipping to the US and EU — duties handled, surprises removed.
PREFERRED FILES — STEP · IGES · SLDPRT · DWG/DXF · PDF
HAVE MULTIPLE PARTS? ONE RFQ PER ASSY IS FINE — LIST THEM IN THE NOTES.