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Custom Injection Molding Services
- T1 samples as fast as 2 weeks for faster validation and approvals
- Certified quality systems: ISO 9001:2015 | ISO 13485 | ISO 14001 | IATF 16949
- High-repeatability production for consistent parts across every run
Bring your product ideas to life quickly and accurately with our expert prototyping services.
Injection Molding Process Capabilities
Standard injection molding for thermoplastic components, delivering high repeatability, consistent part geometry, and reliable surface quality for production-grade plastic parts.
Multi-material injection molding that bonds different materials into a single part, commonly used for enhanced grip, insulation, sealing, or improved aesthetics.tomizable color and texture options.
A specialized injection molding process that integrates metal or threaded inserts directly into plastic parts, improving structural strength and reducing post-assembly requirements.
Our Injection Molding Manufacturing Network
Lewei Precision’s expansive network, featuring over 50 advanced machines handling up to 830 tons, efficiently manages projects from prototypes to large-scale production. Each project starts with a comprehensive injection mold quote to set clear expectations. Our expert project managers offer detailed manufacturing analysis and consultative design services to enhance cost efficiency and functionality.
Injection Molding Materials
ABS
Tough, impact-resistant plastic for housings and consumer components.
Grades
General Purpose ABS
High-Impact ABS
Flame-Retardant ABS
Polypropylene
Lightweight plastic with excellent fatigue resistance for snap-fit parts.
Grades
PP Homopolymer
PP Copolymer
Polyethylene
Flexible and chemically resistant plastic for containers and functional parts.
Grades
HDPE
LDPE
Polycarbonate
High impact strength and heat resistance for structural plastic components.
Grades
Clear PC
Flame-Retardant PC
Nylon
Strong and wear-resistant plastic for mechanical and load-bearing parts.
Grades
PA6
PA66
Glass-Filled Nylon
POM
Low friction and high dimensional stability for precision molded parts.
Grades
POM-H
POM-C
PBT
Dimensional stability and electrical insulation for automotive and electronic parts.
Grades
Glass-Filled PBT
TPU
Flexible elastomer for seals, grips, and soft-touch components.
Grades
TPU Shore A
Injection Mold Surface Finishes
Lewei Precision offers a wide range of surface finish options as part of our injection molding services, helping you achieve the right balance of appearance, functionality, and cost. From high-gloss cosmetic finishes to textured and non-cosmetic options, our surface finishes are selected to match your part’s application, performance requirements, and end-use environment.
A mirror-like, polished finish achieved through diamond buffing. Ideal for cosmetic and consumer-facing parts where visual quality and smoothness are critical.
A clean, professional finish created using fine grit paper. This option minimizes visible tool marks and is commonly used for housings, enclosures, and premium industrial parts.
A cost-effective stone-finished surface that provides a uniform, low-sheen appearance. Suitable for general-purpose injection molded parts where aesthetics are secondary.
A matte or textured finish with visible tooling marks, often used for industrial or non-cosmetic parts where grip, reduced glare, or functional surfaces are required.
Most tool marks are removed, delivering a practical balance between appearance and cost. Commonly used for internal or lightly visible components.
Laser engraving, mold texturing, and custom markings can be applied directly during the injection molding process for branding, identification, or functional surface requirements.
Tolerances for CNC Machining
Features | Description |
Maximum Part Size | 1200 × 1000 × 500 mm |
Minimum Part Size | 5 × 5 × 5 mm |
Part to Part Repeatability | ±0.1 mm |
Mold Cavities | Single-cavity, multi-cavity, family molds |
Available Mold Types | Steel and aluminum molds, suitable for varying production levels |
Production Levels | Below 1000, 5000, 30000, and over 100000 units |
Mold Cavity Tolerances | ±0.02 mm |
Secondary Operations | Mold texturing, pad printing, laser engraving, threaded inserts, and assembly |
Undercuts | Y-type, L-type undercuts |
Wall Thickness | 0.5 mm to 5 mm |
Draft | 0.5° to 2° |
Ribs/Gussets | 0.5 mm to 3 mm thick |
Bosses | Diameter 3 mm to 10 mm |
Lead Time | Most orders completed within 15 working days |
Design Guidelines for CNC Machining
Features | Description |
Wall Thickness | Uniform thickness of 1.5 mm to 3 mm is recommended. Avoid excessively thick or thin walls to prevent warping. |
Radii and Corners | Minimum radius of 0.5 mm for internal corners. Avoid sharp corners to reduce stress points and aid in mold release. |
Draft Angles | Draft angle of 1° to 2° is recommended on vertical walls to ensure smooth part ejection. |
Undercuts | Use side actions or lifters to accommodate undercuts. Proper mold design is necessary for parts with undercuts. |
Tolerances | Standard tolerance of ±0.1 mm. For tighter tolerances (±0.01 mm), specialized molds are required. |
Text and Logos | Minimum engraving depth of 0.1 mm and width of 0.5 mm. CNC engraving or laser marking is used for text/logo creation. |
Holes and Features | Minimum hole diameter of 1.5 mm. For holes larger than 5 mm, inserts or core pins are recommended. |
Parting Line and Gate | Gates should be placed to minimize defects, and parting lines should be positioned in non-visible areas. |
Material Selection | Choose appropriate materials such as ABS, polycarbonate, or nylon, depending on the part’s intended use. |
Injection Molding Design Guide
Quality Control in Injection Molding Services
At Lewei Precision, quality is built into every stage of our injection molding services, starting from pre-production planning through final delivery. Each project begins with detailed pre-production mold inspection to verify tooling accuracy and readiness before sampling or production. During molding, in-process quality monitoring ensures critical parameters such as temperature, pressure, and cycle consistency remain within controlled limits, delivering stable, repeatable results for every plastic component.
After production, all parts undergo final inspection that includes dimensional verification, visual checks, and documented reporting to confirm compliance with specifications. To support transparency and reliability, full traceability is maintained through material certifications, inspection records, and quality documentation. This structured quality control approach ensures our injection molding services consistently deliver precision parts that meet performance, industry, and customer requirements.
- Certifications: ISO 9001:2015, ISO 13485, ISO 14001, IATF 16949
- Experienced team of quality engineers
- State-of-the-art inspection equipment
Prototyping Injection Molding
Get custom plastic prototypes and production parts with flexible solutions from Lewei Precision.
Lewei Precision offers rapid prototyping services for injection molding, delivering high-quality prototypes with quick lead times. We provide flexible material options and expert DFM assistance to help you test functionality and validate designs efficiently.
- Quantity: 1-100 pcs
- Lead Time: 1-3 weeks
- Tooling: Soft tooling or 3D-printed molds
- Key Features: Low-volume, high-quality plastic parts
- Quantity: 1-100 pcs
- Lead Time: 1-3 weeks
- Soft tooling or 3D-printed mold used
Lewei Precision’s low-volume injection molding uses aluminum tooling to produce complex plastic parts quickly and cost-effectively. This service is perfect for design validation, inventory control, and a supply chain capable of adapting to fluctuating demand.
- Quantity: 100-10,000 pcs
- Lead Time: 3-6 weeks
- Key Features: Fast, cost-efficient production of low-volume plastic parts
High-volume injection molding provides a reliable and affordable solution for mass-producing identical, precise parts. With state-of-the-art equipment and rigorous quality control, we ensure tight tolerances and consistent quality across a range of plastic materials to suit your requirements.
- Quantity: Over 10,000 pcs, can scale into the millions
- Lead Time: 4-12 weeks or more
- Materials Available: 100+ thermoplastic and thermoset materials
Start Your CNC Machining Project
Injection molding for various Industries
Lewei Precision provides reliable injection molding services to a wide range of industries, delivering precision plastic components designed to meet specific performance, quality, and regulatory requirements. Our industry experience allows us to support both low-volume and high-volume production with consistent results.
Success Stories of
Lewei Precision x Rennteam Stuttgart: Innovation Collaboration of Racecar Engineering
Lewei Precision proudly supports Rennteam Stuttgart by manufacturing 2 mainbar components and over 80 Aluminum inserts. Our precision engineering ensures they’re ready to conquer the Formula Student competitions, giving the team a winning edge.
Case Study: LURA’s Partnership with Lewei Precision for Precision Rocket Engine Parts
LURA, the Leeds University Rocket Association, used Lewei Precision’s 5-axis CNC machining and turn-mill compounding techniques to create intricate engine parts essential for their victory in the National Race to Space Propulsion Competition.
Case Study: Andrea Piccino Collaborates with Lewei Precision to Bring the “Iron Man Suit” to Live
Andrea, a dedicated mechanical engineer from Italy, utilized Lewei Precision 5-axis CNC machining to produce a full-body passive exoskeleton that boosts human strength and minimizes physical strain.
Case Study: Lewei Precision Powers Arco Aria’s Tether Car Success
Thanks to Lewei persicion, Arco successfully modified his tether car’s engine, including turning the crankshaft and designing a new intake system for improved efficiency.
Injection Molding Workflow: How We Work
Design Review & DFM
We review your CAD files to confirm material selection, part geometry, and moldability before tooling begins.
Mold Design & Tooling
Custom molds are manufactured to ensure accuracy, repeatability, and production-ready performance.
Injection Molding Production
Plastic parts are molded under controlled conditions to maintain consistent quality and tight tolerances.
Inspection & Delivery
Parts are inspected, finished as required, and securely packaged for on-time delivery.
Advantages
Advantages of Injection Molding
Injection molding offers significant advantages for producing high-quality plastic parts with precision and efficiency. As a core manufacturing method within our injection molding services, it supports consistent results across both low- and high-volume production.
- High Repeatability & Consistency Produces identical parts across large production runs with minimal variation.
- Low Cost per Part at Scale Tooling costs are offset by efficient, high-volume manufacturing.
- Wide Material & Finish Options Compatible with a broad range of thermoplastics and surface finishes.
- Excellent Surface Quality Achieves smooth, cosmetic-ready finishes directly from the mold.
- Suitable for Complex Geometries Supports intricate features, thin walls, and detailed designs.
- Scalable from Prototypes to Production Easily transitions from sampling to full-scale manufacturing.
Applications
Applications of Injection Molding
Injection molding is widely used across industries to manufacture durable, functional, and precision plastic components. Our injection molding services support a broad range of end-use applications.
- Housings & Enclosures Protective casings for electronics, automotive, and industrial systems.
- Connectors & Clips Small, precise components requiring repeatability and strength.
- Gears & Mechanical Components Functional plastic parts designed for motion and load-bearing use.
- Medical Device Parts Precision components used in medical and healthcare equipment.
- Consumer Product Components High-quality plastic parts for everyday consumer applications.
- Industrial Plastic Assemblies Durable components and sub-assemblies for machinery and automation.
Why Choose Lewei Precision for Injection Molding Services
Lewei Precision provides injection molding services built for accuracy, reliability, and scalable manufacturing. Our approach combines advanced production technology with engineering expertise to support plastic parts from early prototyping through full-scale production—while maintaining consistent quality, controlled costs, and dependable lead times.
Precision-Driven Manufacturing
We maintain tight dimensional control and repeatability to produce complex plastic parts that meet functional and cosmetic requirements.
Our injection molding services support a smooth transition from T1 samples to high-volume manufacturing without compromising quality.
Early-stage design for manufacturability (DFM) reviews help reduce tooling risks, optimize part design, and shorten overall lead times.
CNC Machining FAQs
1. What are injection molding services used for?
Injection molding services are used to manufacture high-quality plastic parts in large volumes with consistent accuracy, surface finish, and repeatability.
2. Can injection molding be used for prototyping?
Yes, injection molding supports prototyping through low-volume tooling and T1 samples, allowing design validation before full production.
3. What materials are available for injection molding?
Injection molding services support a wide range of thermoplastics, including ABS, PP, PC, Nylon, and engineering-grade plastics for demanding applications.
4. What is the typical lead time for injection molded parts?
Lead time depends on part complexity and tooling, but initial samples are typically delivered within a few weeks after mold approval.
5. How accurate are injection molded parts?
Injection molding offers excellent dimensional accuracy and repeatability, making it suitable for parts with tight tolerances and complex geometries.
6. Is injection molding cost-effective for small production runs?
Injection molding can be cost-effective for small runs using low-volume or bridge tooling, especially when part consistency is required.
7. What surface finishes are available in injection molding?
Injection molding services offer multiple surface finishes, including high-gloss, semi-gloss, matte, textured, and custom finishes.
8. Can inserts be added during the injection molding process?
Yes, insert molding allows metal or threaded inserts to be integrated directly into plastic parts during molding, improving strength and assembly efficiency.
9. How is quality ensured in injection molding services?
Quality is ensured through pre-production mold inspection, in-process monitoring, final inspection, and full documentation for traceability.
10. Which industries commonly use injection molding services?
Injection molding is widely used in automotive, medical devices, electronics, robotics, consumer products, and industrial equipment manufacturing.
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