CNC Precision Parts

CNC precision parts are components machined from bar, plate or billet to a customer’s drawing on computer-controlled mills, lathes and EDM machines, holding tolerances that a stamped, cast or catalogue part cannot. At MetalWorks Plus most precision parts are held to ±0.005 mm on toleranced features, with ±0.001 mm available on specific features.

Our standard is ISO 2768-m with ±0.005 mm on toleranced features. We hold ±0.001 mm on specific features using precision grinding, micro-machining or wire EDM — not across an entire part. Tolerances tighter than ±0.010 mm are verified on a CMM and the report ships with the parts. See the tolerance table above for figures by process.

There is no minimum. We quote single prototypes through to production runs of 100,000+. Unit price drops sharply between 1 and 50 pieces because setup and programming are amortised, so it is usually worth asking for price breaks at 1, 10, 50 and 250 pieces on the same RFQ.

Price is driven by material, cycle time, setup count and tolerance — not by part size alone. The biggest levers you control are material choice (see the cost column above), how many setups the geometry forces, and whether tight tolerances and fine finishes are called out only where they are needed. Send a STEP file and a 2D drawing and you will have an itemised quote within 24 hours.

Typical lead time is 3–5 business days for aluminium and plastics, 5–8 days for steel and stainless, and 7–15 days for titanium and superalloys, measured from drawing approval to shipment. Add 2–4 days for surface treatment and 1–3 days for full first-article inspection. Urgent prototype work runs on a separate 3-day track.

STEP (.step/.stp), IGES, SolidWorks (.sldprt), Parasolid (.x_t) and STL for geometry, plus a 2D PDF or DWG drawing for tolerances, finishes, threads and material. Please send a drawing alongside the model — a 3D file carries no tolerance intent, so without one everything is machined to ISO 2768-m.

Yes. Material certificates to EN 10204 3.1 are available for every stocked grade, and a dimensional report from our CMM ships with each production run at no extra cost. First-article inspection to AS9102 and full PPAP documentation are available on request for aerospace and automotive programmes.

For most housings and brackets, 6061-T6 aluminium is the cheapest and fastest. Choose 7075-T6 when you need strength-to-weight, 316L stainless for corrosion resistance or medical contact, 17-4 PH when you need hardness plus corrosion resistance, and titanium Gr. 5 only where weight or biocompatibility genuinely justifies the cost — it machines slowly and runs roughly four times the price of aluminium.

Yes. We hold ISO 9001:2015, AS9100D for aerospace and ISO 13485 for medical devices, with IATF 16949 for automotive programmes and NADCAP accreditation for special processes. We machine flight-control housings, airframe brackets, bone screws, implant trials and surgical instruments. Certificate copies are sent with the first quote on request.

We ship worldwide from Shenzhen by DHL, FedEx and UPS express (3–5 days door to door) or by air and sea freight for volume orders. Terms are DAP by default, so we handle export clearance and you handle import duty; DDP is available if you would rather we cover both. We ship to 50+ countries, most commonly the USA, Germany, the UK and Japan.

Yes, and on the same tooling and programmes, which is what keeps a part dimensionally identical from prototype through to production. Prototypes run on our CNC prototyping line; volume moves to dedicated cells under machine parts manufacturing. Most customers start with 1–5 pieces and scale once the design is frozen.

Aerospace, medical, automotive and EV, robotics, electronics and general industrial machinery. The 24 samples in the catalogue above are real CNC precision parts from those six industries, each shown with its material, process and specification.

Yes. Titanium Gr. 5, Inconel 718 and PEEK are routine materials for our precision parts, alongside aluminium, stainless steel, brass, copper and tool steel — 70+ grades in total. The materials table above shows lead time and relative cost for each, so you can compare before you send a drawing.

Every production run of CNC precision parts is measured on a coordinate measuring machine before it ships, and the report travels with the shipment. First-article inspection to AS9102 and EN 10204 3.1 material certificates are available, so each precision part can be traced back to its material heat.

Yes. Anodising, passivation, plating, bead blasting, polishing and black oxide are applied to precision parts as listed in the surface finishes table above. If a coating adds thickness to a toleranced feature, mark it on the drawing and we machine undersize so the finished CNC precision part still meets its fit.

Yes. Send the sample and we reverse-engineer it on the CMM, build a 3D model and a drawing, and confirm the dimensions with you before any CNC precision parts are cut.

Yes. We deliver complete assemblies and finished components as well as loose CNC precision parts — bearings, inserts, seals and fasteners can be fitted, and each assembled unit is checked against your drawing before it ships.

Tight tolerances applied to every dimension. Holding ±0.001 mm needs grinding, EDM or micro-machining plus CMM time, so reserve it for the features that need it and let the rest follow ISO 2768-m. Our free DFM review flags tolerances that add cost to your precision parts without adding function.

Yes. An NDA is signed on request before you send anything, and the drawings for your CNC precision parts stay on our own servers.

Lower unit cost at the same tolerance — provided the supplier controls quality. MetalWorks Plus machines CNC precision parts in its own 15,000 m² Shenzhen plant under ISO 9001:2015 and AS9100D, inspects every production run on a CMM, and ships to 50+ countries by DHL, FedEx or air freight.