Injection Molding Services for Custom Parts

High-Quality Injection Molding: Speedy, Precise, and Cost-Effective

Over 50 precision machines producing 12M+ parts monthly.
Complete services from design to final packaging under one roof.
Achieve ±0.05mm precision for intricate components.
Tailored solutions for aesthetics, functionality, and fit.

All-in-one molding solutions for precision, tight-tolerance parts

Injection Molding

Standard injection molding services, covering injection mold design, mold manufacturing, and plastic product production.

Double-color Molding

Simultaneous injection molding of two distinct plastic materials in one cycle.

Insert Molding

Metal components and plastic elements are fused into one cohesive part.

Overmolding

Two mold sets and two injection cycles are used to complete the molding process for two different materials.

Silicon Rubber Molding

Injection molding solutions for mass-producing food-grade and medical silicone products.

Material Selection

Mold Design

Mold Fabrication

Mold Setup

Heating the Material

Injection

Cooling

Mold Opening

Part Ejection

Inspection

Surface Finishing

Packaging

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Featured Cases

With over ten years of experience, KingStar Mold has consistently delivered high-quality plastic and metal parts, driving both customer satisfaction and company growth. Our cases reflect the strength and expertise that define us.

Our cases

Previous Projects

KingStar Mold is a leading provider of custom plastic parts and injection molds, producing 900-1000 molds annually, from simple to complex designs. Our skilled engineers offer complete solutions, including part design, mold design, and injection molding, serving industries like storage, home appliances, baby products, furniture, and automotive.

custom plastic molding factory mold building manufacturing machining

Our Factory In China

KingStar Mold is a leading manufacturer based in China, specializing in custom injection molds and the production of plastic and silicone components. With over ten years of experience, we offer comprehensive solutions from mold design to production, ensuring the highest standards of quality and precision.

Our factory is equipped with advanced machinery and staffed by skilled professionals, dedicated to delivering tailored, high-performance parts for a variety of industries. Whether it’s plastic, silicone, or a combination of materials, KingStar Mold provides reliable, cost-effective solutions for every project.

Quality Control

Manufacturing Precision

Technical Expertise

Lead Time and Efficiency

Customer Service

Equipment and Technology

Compliance with Industry Standards

See Our Injection Molding Production

6 reasons to choose KingStar Mold for injection molding services

Expert Engineering Team

Our experienced engineers offer deep expertise in die casting part design and optimization.
We use advanced software to streamline the design process, ensuring manufacturability and cost-efficiency.
Our team works closely with you to overcome design challenges and meet exact specifications.

Experienced Suppliers

We partner with trusted, reliable suppliers to source high-quality materials for die casting.
This ensures that your parts are made from the best possible raw materials for durability and performance.
Our long-standing relationships with top suppliers guarantee consistent and timely delivery of materials.

Advanced Equipment

At KingStar Mold, we use state-of-the-art die casting machines and technology.
Our advanced equipment allows for precise, high-quality production with quick turnaround times.
From small parts to large, complex designs, we have the machinery to meet your needs.

Clear Communication with Clients

At KingStar Mold, we prioritize transparent and consistent communication throughout the die casting process.
From initial design to final production, we keep you informed at every step.
Our dedicated team is always available to address questions, provide updates, and ensure your project meets expectations.

Quality Control

We implement stringent quality control measures throughout the die casting process.
From raw material inspection to final part testing, we ensure that every component meets your exact requirements.
Our comprehensive quality assurance system minimizes defects and guarantees the highest standards of production.

Cost-Effective Solutions

KingStar Mold is committed to providing cost-effective die casting solutions without sacrificing quality.
We optimize designs for manufacturability to minimize production costs and reduce waste.
Our focus on efficiency helps you achieve competitive pricing for your parts, regardless of production volume.

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KingStar Mold’s Production Capacity

Production Capacity	Details	Production Capacity	Details
Machine Quantity	20+ High-precision injection molding machines	Materials Handled	PE, PP, ABS, PC, POM, Nylon, TPU, and more
Clamping Force	50 to 800 tons	Molding Cycle Time	10 to 60 seconds (depending on part complexity)
Part Weight Range	1g to 5000g	Lead Time for Production	2 to 4 weeks (for standard molds)
Production Volume	Up to 500,000 parts per month	Prototype Production Capability	Rapid prototyping with 3D printing and CNC
Maximum Mold Size	800 mm x 800 mm x 1000 mm	Post-Production Services	Assembly, painting, surface finishing, packaging
Tolerance Accuracy	±0.01 mm	Customization & Flexibility	Tailored solutions for low-volume & complex designs

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Orders Workflow

Initial Consultation & Design Review
We begin by discussing your project’s goals and reviewing the design to ensure it’s optimized for the specific manufacturing process. At this stage, we suggest improvements or adjustments to enhance efficiency, functionality, and manufacturability.

plastic pellets choosing material for plastic injection molding

Material Selection
Our experts assist in selecting the right materials for your product based on performance requirements and compatibility with the manufacturing process. The correct material choice ensures durability, cost-effectiveness, and the desired product functionality.

Design & Engineering
Using advanced CAD and simulation tools, we develop a custom design for your project. This step ensures precise details and identifies potential challenges early in the process, optimizing the design for efficient manufacturing.

Prototyping & Sample Testing
A prototype or sample is created to verify design accuracy, functionality, and performance. Rigorous testing is conducted to ensure the product meets your specifications before moving into full-scale production.

Production Setup & Initial Production
We set up the required machines, molds, or tools for the manufacturing process. The initial production run is performed to confirm the setup, assess quality, and fine-tune settings for optimal results.

Final Production & Quality Control
After final approval, we proceed with full-scale production, ensuring continuous quality checks. Comprehensive inspections at each stage ensure that every part meets the highest standards before delivery.

Materials For Injection Molding

ABS

A strong, impact-resistant plastic commonly used in automotive and consumer goods applications.

PEEK

A thermoplastic with excellent chemical and thermal resistance, used in aerospace and medical applications.

PEI

A tough, high-heat resistant plastic used in automotive, aerospace, and electrical applications.

PA

Also known as nylon, it’s a durable, wear-resistant plastic ideal for automotive and industrial parts.

PBT

A strong, heat-resistant plastic used in automotive, electrical, and electronic components.

PC

A tough, high-impact plastic with excellent clarity, used in eyewear lenses and automotive parts.

PE

A versatile, lightweight plastic known for its chemical resistance and low friction properties.

PMMA

A transparent plastic often used as a glass substitute in lighting, signage, and optical lenses.

POM

A high-performance, low-friction plastic used in precision engineering applications like gears and bearings.

PP

A flexible, durable plastic with high resistance to chemicals and fatigue, often used for containers and packaging.

PPS

A high-temperature, chemically resistant plastic used in automotive and electrical applications.

PS

A rigid, inexpensive plastic often used in disposable products like packaging and cutlery.

TPU

A flexible, durable plastic with excellent abrasion and impact resistance, used in footwear and automotive applications.

PTFE

Known as Teflon, it’s a non-stick, high-temperature resistant material used in seals, gaskets, and cookware.

PPSU

A durable, high-temperature plastic used in plumbing, medical, and aerospace industries.

PVC

A rigid or flexible plastic used in construction, plumbing, and electrical applications.

PLA

A biodegradable, plant-based plastic, ideal for eco-friendly applications and easy to mold.

Surface Finishing Service at KingStar Mold

KingStar Mold offers a comprehensive range of surface treatment services to enhance the appearance, functionality, and durability of your injection-molded parts. Our services include options such as polishing, painting, anodizing, coating, and laser engraving, designed to improve surface finish, corrosion resistance, and wear resistance. By applying these treatments, we help ensure that your parts meet the highest quality standards, with the right finish for both aesthetic and performance requirements.

Anodizing

Hotstamping

Electroplating

Laser Engraving

Pad Printing

Spraying

Sand Blasting

Silkscreen

grinding and polishing cnc as machined surface finishing

Grinding & Polishing

20+

Types Available

400M+

Capacity Monthly

20+

Partnerships

10Y+

Experience

99%+

Satisfactory Rate

Learn More

Key Benefits of Choosing KingStar Mold

High Precision and Expertise

With over a decade of experience, KingStar Mold ensures your plastic parts are crafted with exceptional precision.
Our expert designers work closely with you to bring your mold designs to life, meeting your exact specifications.
Whether you’re creating home appliance parts or complex components, we guarantee precise and reliable results.

Fast Turnaround and Competitive Pricing

We offer a streamlined process that delivers quick lead times and ensures a fast turnaround for your projects.
Our efficient workflow helps keep costs down, allowing us to offer competitive pricing without compromising on quality.
We understand the need for speed in business and provide instant quotes to keep your production timeline on track.

Comprehensive One-Stop Service

KingStar Mold provides a complete range of services, from mold design to manufacturing, all under one roof.
Our extensive experience with existing molds helps us streamline the process and avoid common issues.
With our comprehensive approach, we simplify the molding process and save you time.

Industries We Serve

What’s the typical lead time for injection molding projects?webadmin2025-07-15T01:35:39+00:00

What’s the typical lead time for injection molding projects?

Hard to pin down an exact number—it really depends on how complex your project is. For new molds, simpler ones might be ready in 4 to 8 weeks. If the mold is more complex or larger, it could take 8 to 12 weeks.

Once the mold is good to go, production times shift. Small batches (like 100 to 1,000 pieces) usually ship out in a week or two. Bigger runs—10,000 units or more—tend to take 2 to 4 weeks, but that depends on exactly how many you need.

Stuff like getting the right materials, adding custom finishes, or hitting super tight tolerances can push things a bit. We’ll lay out a clear timeline once we know your details, and keep you in the loop to make sure nothing slips. Share your design, and we can give you a better sense of when things will be ready.

Do you offer custom mold design services?webadmin2025-07-14T08:39:28+00:00

Do you offer custom mold design services?

Yes, we do offer custom mold design services—tailored to your specific product needs, materials, and production goals.

Our design process starts with deep dives into your part details: what material you’re using (whether it’s PA6+30%GF, ABS, or something else), how complex the part geometry is (like undercuts, thin walls, or embedded inserts), the tolerance requirements (critical for things like gears or structural components), and your production volume (small-batch runs vs. high-volume mass production).

For example, if you’re making a part with insert molding (like a steel core in PA plastic, as we did for electric scooter wheels), we’ll design features like locating grooves or vent holes to prevent shifting or air bubbles. If your part has thick sections prone to sink marks (like table connectors), we’ll add optimized cooling channels to ensure even cooling. And for more case studies, you can refer to our case study page (click here).

We use CAD and CAE tools to simulate mold flow, check for potential issues (like warpage or uneven filling) before machining, and iterate with you on tweaks—whether it’s adjusting gate positions, refining cavity geometry, or choosing mold materials (aluminum for rapid prototyping, steel for long-term production).

The goal? A mold that not only produces parts that meet your specs but also runs efficiently—minimizing scrap, reducing cycle times, and fitting your budget. No two projects are the same, and that’s why custom design, paired with our one-stop capabilities and DFM expertise, is at the core of what we do.

What is the difference between rapid tooling and production tooling?webadmin2025-07-14T08:49:41+00:00

What is the difference between rapid tooling and production tooling?

Rapid tooling and production tooling are both used in manufacturing, but they’re built for very different stages and needs.

Rapid tooling is all about speed and flexibility. It’s designed to get molds ready quickly—often in days or weeks—to test new designs, make small batches, or validate if a part works in real use. It’s like a “quick prototype” for molds, prioritizing speed over long-term durability.

Production tooling, on the other hand, is made for the long haul. It’s engineered to handle high-volume, repeated production runs (think hundreds of thousands to millions of units) efficiently and consistently. It takes longer to build but is tough enough to last through constant use, making it ideal for mass-producing mature, finalized products.

For your convenience in reading, we have compiled the following table for quick comparison.

Category	Rapid Tooling	Production Tooling
Primary Use	Prototyping, design validation, small-batch production (testing if a part works before scaling up)	Mass production of finalized products; high-volume, long-term manufacturing (100,000+ units)
Common Materials	Aluminum (e.g., 7075, 6061), low-hardness metals (easier to machine quickly)	High-strength steel (e.g., P20, H13) or durable alloys (built to resist wear from repeated use)
Production Lead Time	Short (a few days to 3 weeks)	Longer (4+ weeks; complex molds may take 2–3 months)
Lifespan	Limited (a few thousand to 50,000 cycles)	Long (100,000+ cycles; often millions for steel molds)
Cost	Lower upfront (faster to make, cheaper materials)	Higher upfront (more durable materials, tighter precision)
Suitable Production Scale	Small batches (100–10,000 units)	Large-scale production (100,000+ units)
Design Flexibility	High (easy to modify if the design changes; low cost to adjust)	Lower (harder and costlier to modify; best for finalized, unchanging designs)

How do I get started for my injection molding project?webadmin2025-07-14T09:08:19+00:00

How do I get started for my injection molding project?

Getting started for your injection molding project is not complicated, and the process adjusts based on where you are in the development cycle—whether you’re just starting with an idea, have a design ready, or already have a proven part. Here’s how it works:

1. If you only have an idea (no design yet)

No problem—we’ll help turn it into a tangible plan. Just share:

What the part will do (e.g., “a gear for a small motor” or “a housing for a sensor”).
Rough details: expected size (even a hand-drawn sketch helps), target material (or let us suggest based on use), and how many units you might need (e.g., “1,000 for testing” or “100,000+ for mass production”).
Any special needs: Does it need to be heat-resistant? Water-tight? Meet a specific strength standard?

We’ll handle the rest as a one-stop service: from designing the part (with DFM checks to make it mold-friendly) to building the mold, producing samples, and even handling final shipping.

2. If you have a design (blueprints or 3D models)

To get a precise quote, share your design files in common formats like CAD (SolidWorks, AutoCAD), STEP, or IGS—these let us analyze dimensions, complexity, and moldability.

We’ll also need a few extra details to refine the quote:

Material preferences (e.g., PA, ABS, or “let us recommend”);
Production volume;
Tolerance requirements;
Surface treatments (e.g., “matte finish” or “UV-resistant coating”).

With these, we can quickly outline costs for mold making (if needed) and production. You can upload these files on our contact page or send via email: sales@kingstarmold.com

3. If you have a design that’s already been produced

Even easier—share what you’ve got:

Existing mold details (if you have one: who made it, how many cycles it’s run).
Past production notes: material used, any issues (e.g., “parts warped slightly” or “mold runs slow”).

We can either reproduce the part as-is or suggest optimizations (e.g., tweaking mold flow to reduce defects, or adjusting processes to cut cycle time).

Just send over your details via email or our contact form, and we’ll get back with a quote within 1–3 business days. The more info you share, the more accurate it’ll be—no guesswork needed. Let’s get started!

What materials can be used for injection molding?webadmin2025-07-14T09:17:15+00:00

What materials can be used for injection molding?

Injection molding relies on a variety of materials, each suited to different needs based on their performance. Let’s break them down simply:

First, there are general purpose plastics. These are budget-friendly, easy to work with, and great for basic, low-stress items—think everyday consumer goods. They offer solid moldability and basic mechanical properties. Examples include PE, PP, PS, and PVC.

Then there are engineering plastics. These step up in strength, toughness, and resistance to heat or chemicals, making them good for parts that need to hold up in more demanding roles—like automotive components or electronics. You’ll often see ABS, PA, POM, PC, and TPU in this group.

Finally, high-performance plastics are built for extreme conditions: high temperatures, harsh chemicals, or heavy loads. They’re tough but pricier, used in industries like aerospace or medical. Examples here include PEI, PEEK, PPS, and PTFE.

Want to dive deeper into each material’s specifics—like their exact properties, best uses, or how to process them? Check out our full guide: Plastic Injection Molding: Material Alternatives

What is injection molding?webadmin2025-07-14T09:26:19+00:00

What is injection molding?

As is mentioned above the page, injection molding is a manufacturing process where molten plastic is injected into a custom mold, then cooled and solidified to form a part—think of it like pouring melted wax into a mold to make a candle, but scaled up for mass production. It’s versatile enough to make everything from small gears to large automotive parts, works with a wide range of plastics (like the ones we mentioned earlier), and handles both small batches and high-volume runs efficiently.

For a deeper dive into how it works, key steps in the process, or how it compares to other manufacturing methods, check out our full guide: What is Plastic Injection Molding?

How do I get a quote?webadmin2025-07-15T00:51:33+00:00

How do I get a quote?

We offer several ways for you to contact us. Firstly, you can click here to access our contact page, and all you need to do is fill out a form to provide us with your information, requirements, and you can also upload some documents. Alternatively, you can send us an email to the address: sales@kingstarmold.com. Or you can call us directly to discuss your needs by calling +86 512 5799 9297. No matter which method you choose, we will reply to you within 24 hours and provide you with a detailed quotation after clarifying the details through communication.

Can you handle complex or multi-part molds?webadmin2025-07-15T00:55:16+00:00

Can you handle complex or multi-part molds?

We do standard injection molding, but we’ve also got specialized processes to handle different needs. Like two-shot injection molding—does two materials or colors in one go, no need to put parts together later. Insert molding lets us add metal or other inserts right into the plastic while it’s forming, so you get stronger parts without extra fastening steps. Overmolding? That’s when we layer soft stuff like TPU over rigid plastic for better grip or protection.

Thin wall injection molding makes super thin (under 0.5mm) parts that are still tough—good for lightweight stuff like packaging or small electronics. IMD and IML? Those add graphics or textures during molding, so the finish stays put and doesn’t scratch off. And precision molding? We hit tight tolerances, down to ±0.005mm, for parts that need to be exact—like in aerospace or medical gear.

How do you ensure cost-efficiency in injection molding?webadmin2025-07-15T01:13:59+00:00

How do you ensure cost-efficiency in injection molding?

We keep costs down firstly through early DFM to simplify designs and avoid mold reworks, using processes like two-shot or insert molding to skip extra steps, and picking the right materials (no overspending on high-performance plastics when basic ones could work just as well).
Plus, our lower labor costs help trim expenses without cutting quality.
For a deeper look at factors impacting cost and ways to lower it, you can check our post Injection Molding Cost: All Factors and How to Reduce It

What post-production services do you offer for molded parts?webadmin2025-07-15T01:18:27+00:00

What post-production services do you offer for molded parts?

We handle a range of post-production steps to get your molded parts ready for use or shipping. That includes surface finishing like painting, silk-screening, sand blasting, black oxide and so on; assembly work (fitting components together, adding fasteners); quality checks (dimensional testing, defect inspections…); and custom packaging (from bulk crates to retail-ready boxes).

Can you help with design optimization for injection molding?webadmin2025-07-15T01:23:23+00:00

Can you help with design optimization for injection molding?

Yes, we can. Our DFM (Design for Manufacturability) service helps optimize your design for injection molding—tweaking features to improve mold efficiency, reduce defects, and cut costs. Also we offer mold flow analysis to anticipate potential problems and solve them at early stage.

For more insights, check out our design tips.

How do you ensure the quality of injection-molded parts?webadmin2025-07-15T01:30:43+00:00

How do you ensure the quality of injection-molded parts?

Our quality assurance framework for injection-molded parts is built on systematic procedures and rigorous inspection protocols to ensure consistency and reliability:

We adhere to a comprehensive set of quality control documents that govern every stage of production. These include procedures for managing nonconforming products, implementing corrective and preventive actions, controlling inspection and test statuses, addressing customer complaints, auditing suppliers, maintaining product traceability, and conducting incoming material checks, in-process inspections, and final ex-works verifications. This structured approach ensures accountability at every step.

To provide transparent quality validation, we offer three tiers of inspection reports:

Quality Inspection: Automatically included with all orders, it confirms manufacturing process integrity through key checks (e.g., 4 plane-to-plane and OD measurements) with no extra lead time.

Digital Inspection: Cost-effective for verifying up to 50 critical dimensions (OD/ID, hole locations, angles) via color-mapped reports, typically requiring 3+ additional days.

Conventional Inspection: Handles unlimited measurements (including GD&T) for complex parts, mandatory for components exceeding 8 inches in diameter or 5 inches in height, with a 7+ day lead time.

Backed by advanced measuring equipment and a skilled quality team, our quality management system integrates real-time data collection and proactive problem-solving. This commitment to precision ensures that every part meets specified standards, with continuous improvement practices embedded to refine processes over time.