Custom Machine Parts
CNC machined to your drawings in Shenzhen — shafts, gears, couplings, bearing housings and hydraulics, from one piece to 10,000+.
- ISO 9001:2015, AS9100D and NADCAP accredited
- ±0.001mm to ±0.005mm, CMM-verified on every run
- No minimum order — 1 piece to 10,000+ units
- Express shipping from Shenzhen to 50+ countries
Talk to a CNC Engineer
Machine Parts We Manufacture
These 24 machine parts are what MW+ customers order most often. Every one is made to your drawing, not from a catalogue — material, tolerance and finish are yours to specify, and every part ships with an EN 10204 3.1 material certificate and a dimensional report.
Precision Main Shaft
High-strength main shaft for industrial gearboxes and heavy machinery. Heat treated and certified.
Integrated Gear Shaft
One-piece gear shaft for automotive and industrial transmissions. AGMA Class 10 quality.
Involute Splined Shaft
Precision splined shaft for high-torque transmission in off-highway and industrial equipment.
Custom Drive Shaft
For conveyors, pumps, motors, and agricultural equipment. Balanced and certified.
Precision Spur Gear
High-quality spur gear for general power transmission, pumps, and industrial machinery.
Helical Gear
High-speed gearbox applications with reduced noise and increased load capacity.
Bevel Gear Set
Right-angle drives for automotive differentials, industrial gearboxes, and heavy equipment.
Gear Blank
Rough machined gear blank with all stock removed. Ready for final gear cutting operations.
Rigid Shaft Coupling
Rigid coupling for motor-pump connections and direct drive applications.
Flexible Beam Coupling
Compensates for angular and parallel misalignment in servo and stepper motor applications.
Keyed Coupling
Heavy-duty industrial coupling for high torque transmission in mining and steel mill applications.
Universal Joint Yoke
For driveshafts in heavy equipment, agricultural machinery, and industrial vehicles.
Precision Bearing Housing
For pillow block or flange mount bearing applications in industrial machinery.
Pillow Block Housing
Standard bearing support for conveyor systems, fans, and material handling equipment.
Flanged Bearing Housing
Compact bearing mounting solution for space-constrained applications.
Bronze Bushing
Wear-resistant, low-friction bushing for hydraulic cylinders, pivot points, and bearings.
Pump Housing
Centrifugal and gear pump casings machined to tight tolerances for hydraulic applications.
Gearbox Housing
Precision housing for gear drives, speed reducers, and transmission assemblies.
Motor Housing
Electric motor enclosure with integrated cooling fins. Custom bore sizes available.
Compressor Housing
Scroll and reciprocating compressor casings for HVAC and refrigeration systems.
Hydraulic Valve Body
Hydraulic directional control valve body with precision-machined spool bores.
Hydraulic Manifold
Integrated circuit manifold for hydraulic systems. SAE, NPT, or ORFS ports available.
Hydraulic Fittings
Precision hydraulic fittings for high-pressure applications up to 10,000 PSI.
Cylinder End Cap
Hydraulic and pneumatic cylinder heads with custom porting and mounting options.
Not on this list? We still make it
The twenty-four machine parts above are what customers order most often — examples, not limits. We accept custom manufacturing requests for any machine part you can draw or hand us.
- Any component we can mill, turn, Swiss-turn, grind, EDM or laser cut
- Work from a CAD model, a 2D drawing, a hand sketch, or a sample part we reverse-engineer on the CMM
- One-off replacements for obsolete machinery through to repeat production runs
- 70+ materials, from 6061 aluminium to titanium, Inconel, PEEK and bronze
- Sub-assemblies and finished parts with hardware, bearings or inserts fitted
- Free DFM review before you commit, and an NDA signed before you send anything
What we hold, what we cut, what it costs
Everything a buyer checks before sending a machine part drawing. Unless the drawing says otherwise we machine to ISO 2768-m and hold ±0.005 mm on toleranced features.
Machine part specifications
Four tables covering tolerance, material, finish and geometry limits.
Tolerances by feature
| Feature | Standard | Precision | Best achievable | Process at the tight end |
|---|---|---|---|---|
| Linear dimensions | ±0.01 mm | ±0.005 mm | ±0.001 mm | 5-axis multi-axis machining, jig boring |
| Turned diameters | ±0.01 mm | ±0.005 mm | ±0.001 mm | Swiss turning, cylindrical grinding |
| Bores and fits | H9 | H7 | H5 | Reaming, honing, jig grinding |
| Concentricity / runout | 0.02 mm TIR | 0.01 mm TIR | 0.003 mm TIR | Single-setup turn-mill |
| Flatness | 0.05 mm | 0.02 mm | 0.005 mm | Surface grinding, lapping |
| Gear tooth quality | AGMA 8 | AGMA 10 | AGMA 12 | Hobbing, profile grinding |
| Threads | 6H / 6g | 4H / 4g | Class 3B / 3A | Single-point, thread grinding |
| Sharp internal corners | R0.8 mm | R0.2 mm | Square | Wire and sinker EDM |
| Features under 0.5 mm | — | ±0.005 mm | ±0.001 mm | Micro-machining |
| Surface roughness | Ra 3.2 µm | Ra 0.8 µm | Ra 0.1 µm | Grinding, polishing, lapping |
How to read this. Standard costs no premium. Precision is quoted on request. Best achievable applies to one controlled feature, not every dimension. Anything tighter than ±0.01 mm is CMM-verified and reported with the shipment — see our quality assurance process.
Materials, lead times and relative cost
| Material | Stocked grades | Machinability | Lead time | Cost | Typical machine parts |
|---|---|---|---|---|---|
| Aluminium | 6061-T6, 7075-T6, 2024 | Excellent | 3–5 days | $ | Housings, manifolds, brackets |
| Stainless steel | 303, 304, 316L, 17-4 PH | Good | 5–8 days | $$ | Shafts, valve bodies, pumps |
| Carbon & alloy steel | 1045, 4140, 4340, 8620 | Good | 5–8 days | $$ | Shafts, gears, couplings, yokes |
| Cast & ductile iron | GG25, GGG40, GGG60 | Good | 6–10 days | $$ | Bearing and gearbox housings |
| Bronze & brass | C932, C954, C360 | Excellent | 4–6 days | $$ | Bushings, wear plates, fittings |
| Titanium | Gr. 2, Gr. 5, Gr. 23 | Difficult | 7–12 days | $$$$ | Lightweight shafts, fittings |
| Inconel & superalloys | 625, 718, Monel, Hastelloy | Very difficult | 10–15 days | $$$$$ | Hot-section components |
| Engineering plastics | PEEK, Delrin, PTFE, nylon | Excellent | 3–5 days | $–$$$$ | Bushings, insulators, gears |
Machine part lead times run from drawing approval to shipment and assume stocked material. Add 2–4 days for plating or heat treatment. Urgent work runs on a separate 3-day CNC prototyping track, with 48-hour express available. EN 10204 3.1 certificates for every grade.
Surface finishes and heat treatment
| Treatment | Result | Applies to | Added time | Why specify it |
|---|---|---|---|---|
| As-machined | Ra 1.6–3.2 µm | All metals | — | Internal, non-wearing surfaces |
| Bead blasting | Uniform matte | Aluminium, stainless | +1 day | Hides tool marks on housings |
| Anodising Type II | 5–25 µm | Aluminium | +2–3 days | Corrosion resistance and colour |
| Anodising Type III | 25–50 µm | Aluminium | +3–4 days | Wear surfaces, hydraulic bores |
| Passivation | No size change | Stainless | +1 day | Restores chromium oxide layer |
| Electropolishing | Ra −50% | Stainless | +2–4 days | Medical and vacuum cleanliness |
| Zinc / nickel / chrome | 5–25 µm | Steels | +2–4 days | Corrosion protection on steel |
| Through hardening | 28–50 HRC | 4140, 4340, 1045 | +3–5 days | Shafts under high torque |
| Case hardening | 0.6–1.2 mm, 58–62 HRC | 8620, 20MnCr5 | +4–6 days | Gear teeth: hard face, tough core |
| Nitriding | 0.2–0.6 mm, 60+ HRC | 4140, tool steels | +4–6 days | Wear resistance, low distortion |
Dimension after plating. Plating and hard anodising add material to the surface. If a bore or shaft has to hold its fit, mark the drawing and we machine undersize to suit — the most common reason a correctly made machine part fails incoming inspection.
Design limits
- Maximum part size
- 2000 × 1000 × 500 mm
Milled envelope. Turned up to ø500 × 1500 mm.
- Minimum wall thickness
- 0.5 mm metal
1.0 mm for plastics. Thinner walls chatter.
- Minimum hole diameter
- 0.5 mm
Down to 0.2 mm on the micro-machining line.
- Maximum hole depth
- 10 × diameter
Deeper cross-holes are gun-drilled.
- Internal corner radius
- ≥ 0.5 mm
Use 1/3 of cavity depth. Square corners need EDM.
- Thread range
- M1 – M64
UNC, UNF, BSP, NPT. Inserts on request.
- Tightest bore fit
- H7
H5 on ground and honed features.
- Keyways & splines
- DIN 5480 / ANSI B92.1
Broached or hobbed, internal and external.
File formats. STEP or IGES for geometry plus a 2D PDF or DWG carrying tolerances, finish, threads and material. Without a drawing everything is machined to ISO 2768-m. No drawing at all? Send the worn machine part and we reverse-engineer it on the CMM.
Certified to ISO 9001:2015, AS9100D, ISO 13485, IATF 16949 and NADCAP, with RoHS and REACH declarations for the EU. Certificate copies travel with your first quote on request.
Who we build for
The machine parts above come from real production orders across these six industries. If the process you need is not on this page, it is on one of these.
Aerospace & Defence
Brackets, engine mounts, actuator bodies. AS9100D, FAI to AS9102, DFARS stock on request.
Automotive & EV
Transmission shafts, gear blanks, EV motor housings. IATF 16949 planning with PPAP 1–5.
Medical & Dental
Instrument bodies and drill guides in 316L and PEEK. ISO 13485, passivated or electropolished.
Robotics & Automation
Arm sections, joint housings, end-effector plates. Bearing bores held in one 5-axis setup.
Electronics & Semiconductors
Enclosures, heat sinks, RF shields, wafer-handling parts. Burr-free sealing edges.
Heavy Industrial
Valve bodies, manifolds, pump and gearbox housings up to 1.5 m. Hardened or nitrided.
Questions buyers ask first
The questions engineers and buyers send us before a first machine parts order.
What are custom machine parts?
How do I order custom machine parts from China?
Which machine parts do you make most often?
What tolerances do your custom machine parts hold?
Which materials are best for machine parts?
Can you make replacement machine parts for obsolete machinery?
Do you supply machine parts for OEM production?
How are machine parts inspected before shipping?
Can you heat treat or plate machine parts?
Is there a minimum order quantity?
What drives the cost of a machine part?
How long does it take to get custom machine parts?
What file formats do you accept?
Do you ship custom machine parts internationally?
How do you protect our drawings and designs?
Can you make a part if we have no drawing?
Send your drawing, get a quote in 24 hours
Upload a STEP, IGES, DWG or PDF and an engineer — not a sales rep — comes back within 24 hours with a price, a lead time and free design-for-manufacturability feedback.
How ordering works
Send your drawing
Upload a STEP or IGES model and, ideally, a 2D drawing carrying tolerances, surface finish and material. No drawing? Send the physical part and we will reverse-engineer it on the CMM.
Quote and DFM feedback within 24 hours
You get a unit price at your quantity, a lead time, and a short list of anything on the drawing that is driving cost unnecessarily. There is no charge for this and no obligation.
Order confirmation and material release
We confirm material grade, heat number source and finishing scope in writing before buying stock. For repeat work we hold material so the second order runs faster.
First article inspection
We machine one part, measure it against your drawing on the CMM and send you the report. Nothing else is cut until you approve it.
Production run and in-process control
Critical dimensions are checked at set frequency through the run, with SPC data on volume orders. Any drift is corrected before it becomes a batch of scrap.
Final inspection, documentation and dispatch
Final CMM report, EN 10204 3.1 material certificate, certificate of conformity and any RoHS, REACH or PPAP paperwork travel with the shipment via DHL, FedEx or air freight.
- No minimum order — 1 piece to 10,000+
- Free DFM review with every quote
- NDA signed before you send anything, on request
- DHL, FedEx and air freight to 50+ countries
Prefer to talk first? Email jy.liu@metalworksplus.com or message us on WhatsApp.
Machine Parts quote request
Send a drawing or a sample part. An engineer replies within one business day with unit price, lead time and free DFM feedback.