Custom precision CNC machining PMMA parts in China
High-accuracy acrylic components machined from certified-grade PMMA stock, delivered with tight tolerances, optical-grade surface finish, and reliable lead times. As a China-based manufacturer, we produce custom CNC machining PMMA parts for optical, medical, display, and industrial applications worldwide.
What we machine
PMMA (polymethyl methacrylate), commonly known as acrylic, is a transparent thermoplastic valued for its optical clarity, weather resistance, and low density. Our shop specializes in custom CNC machining PMMA parts in China, covering milling, turning, drilling, tapping, and polishing operations on both cast and extruded acrylic sheets, rods, and tubes.
From single prototype runs to mid-volume production batches, every part is programmed from your 2D drawings or 3D models and inspected against the dimensions and surface finish you specify. We work with general-purpose, optical, and impact-modified PMMA grades to match your end-use environment.
At a glance
- Material: PMMA / acrylic (cast & extruded)
- Processes: CNC milling, CNC turning, drilling, tapping, polishing
- Tolerance: down to ±0.01 mm on critical features
- Surface finish: up to Ra 0.4 µm after diamond polishing
- Batch size: 1 piece prototype to 5,000+ pieces production
- Lead time: 3–7 working days for prototypes, 10–20 days for production
Why source custom CNC machining PMMA parts in China from us
Four reasons engineers and buyers choose our shop for precision acrylic components, from first article to repeat production.
Optical-grade surface control
Diamond-polished and flame-polished finishes achieve crystal-clear surfaces free of tool marks, suitable for lenses, light guides, and display windows where transparency and light transmission are critical.
Tight-tolerance machining
High-rigidity CNC spindles and sharp, polished tooling hold dimensional accuracy down to ±0.01 mm, with in-process CMM and micrometer inspection on every critical feature.
Low-stress processing
PMMA is sensitive to heat and clamping force. We use high spindle speed, moderate feed, sharp tooling, and air cooling to minimize internal stress, micro-cracks, and thermal deformation.
Flexible batch sizes
Whether you need one machined acrylic prototype for form-and-fit testing or a few thousand production parts, our workflow scales without forcing you into high minimum order quantities.
PMMA commercial grades by national standard
PMMA is classified differently across major industrial standards. The table below maps common grade designations and trade names so you can specify the right material for your custom CNC machining PMMA parts in China.
| Standard | Region | Grade designation | Common trade names |
|---|---|---|---|
| ASTM D788 | United States | Type I Type II Type III Type IV Type V | Plexiglas, Acrylite, Lucite |
| ISO 15527 | International | PMMA groups by MFR designated by melt flow rate | Generic PMMA molding & extrusion compounds |
| DIN 7748 | Germany | Viscosity classes molding & extrusion types | Plexiglas (Röhm), Deglas, Altuglas |
| JIS K 6717 | Japan | Classes by MFR optical & general grades | Sumipex, Shinkolite, Paraglas, Acrypet |
| GB/T 15597 | China | PMMA-MA PMMA-MB PMMA-MC extrusion & molding types | Domestic cast & extruded acrylic sheet and rod |
| RoHS / REACH compliant grades | Global supply | UV-stabilized impact-modified optical | Supplier-specific optical and weathering grades |
Note: grade availability depends on stock form (sheet, rod, tube) and batch size. Tell us your drawing or application and we will recommend the most cost-effective PMMA grade for your custom CNC machining PMMA parts in China.
Machining capabilities for PMMA parts
A complete in-house process chain for custom CNC machining PMMA parts in China, from raw stock to finished, inspected component.
3-axis CNC milling
Pockets, profiles, counterbores, and complex 2.5D geometries on acrylic sheet and block.
CNC turning
Round parts, bushings, spacers, and threaded components from PMMA rod and tube.
Drilling & tapping
Precision holes, through and blind, with tapped threads using spiral-flute acrylic taps.
Diamond polishing
Optical-quality edge and surface polishing for lenses, windows, and light guides.
Flame polishing
Clear, glossy edge finish on cut acrylic profiles, fast and cost-effective for visible parts.
Laser cutting & engraving
Thin-sheet profiling, logos, scales, and micro-features with clean, polished cut edges.
Typical applications of machined PMMA parts
Custom CNC machining PMMA parts in China serve a wide range of industries where clarity, light weight, and dimensional precision matter.
Optical & lighting
Lenses, light guides, diffusers, LED housings, and instrument covers requiring high light transmission.
Medical & laboratory
Fluidic manifolds, cuvettes, microscope components, and sterilizable transparent fixtures.
Display & signage
Display stands, point-of-sale fixtures, backlight panels, and precision-cut acrylic signage.
Industrial equipment
Machine guards, sight glasses, gauge covers, and protective windows for automation lines.
Electronics & semiconductor
Test sockets, wafer handling trays, and insulating components where static control is needed.
Automotive & aerospace
Interior trim, instrument lenses, lighting bezels, and lightweight transparent structural parts.
Machined PMMA products
Representative parts produced for customers ordering custom CNC machining PMMA parts in China. Images shown are typical examples of our machining output.
Technical specifications & tolerances
Reference values for PMMA material properties and the machining accuracy we routinely hold on custom CNC machining PMMA parts in China.
PMMA material properties
| Density | 1.18 g/cm³ |
| Light transmission | 92% (3 mm clear sheet) |
| Rockwell hardness | M 85–105 |
| Tensile strength | 50–77 MPa |
| Heat deflection temp. | 75–105 °C |
| Coefficient of thermal expansion | 70–80 × 10-6 /°C |
| Water absorption (24 h) | 0.3% |
| UV resistance | Excellent (outdoor-stable grades) |
Machining accuracy reference
| Linear dimension | ±0.01 mm (critical), ±0.05 mm (general) |
| Hole diameter | ±0.005 mm (reamed), ±0.02 mm (drilled) |
| Position tolerance | ±0.01 mm |
| Flatness | 0.01 mm / 100 mm |
| Surface roughness (as-machined) | Ra 0.8–1.6 µm |
| Surface roughness (polished) | Ra 0.4 µm or better |
| Min. wall thickness | 0.5 mm (geometry-dependent) |
| Max. part size (milling) | 1200 × 600 × 200 mm |
Sourcing & production details
Practical information for buyers and engineers planning custom CNC machining PMMA parts in China.
What file formats do you accept?
We work from STEP, IGES, XT, DWG, DXF, and PDF drawings. A 3D model plus a 2D drawing with critical dimensions and tolerances gives the most accurate quote and machining result.
How do you prevent PMMA cracking?
We use sharp single-flute or polished carbide tools, high spindle speed, peck drilling for deep holes, soft fixturing, and air cooling. Parts are stress-relieved when needed and packed with protective film to avoid transport damage.
Can you match a specific PMMA grade?
Yes. Provide the standard and grade from your drawing (for example ASTM D788 Type II or DIN 7748 molding grade) and we will source equivalent cast or extruded stock. If a grade is unavailable, we propose a documented alternative before machining.
What is included in each shipment?
Every batch ships with a dimensional inspection report for critical features, material lot identification, and protective packaging. First-article inspection is available on request for new part numbers.