Injection Mold Manufacturing Services in China
From DFM review and mold design to CNC machining, trial molding and export shipment, CKMold provides custom plastic injection mold manufacturing services for global customers.
Custom Injection Mold Making Service by CKMold
CKMold provides complete injection mold making services with a focus on precision, manufacturability and practical project communication. Based in China and serving overseas customers, we support new product development, prototype tooling, production molds, mold modification and plastic injection molding.
Our engineering team reviews your 3D drawings, 2D drawings, material requirements, surface finish, tolerance needs and target production volume before recommending a mold structure. This helps reduce avoidable design changes and makes the mold build easier to control from quotation to T1 samples.
- Custom plastic injection molds for prototypes and production
- DFM review, mold design and mold-flow discussion when required
- CNC machining, EDM, fitting, polishing and mold assembly
- Trial molding, sample inspection and mold adjustment
- Mold export preparation or ongoing injection molding support
Custom Mold Engineering and Steel Selection
The right mold steel affects mold cost, lead time, service life, surface finish and maintenance. CKMold selects steel according to part material, annual volume, tolerance, texture, corrosion risk, glass fiber content and expected mold life.
For a simple ABS or PP part, a pre-hardened steel may be enough. For abrasive engineering plastics, transparent parts, high-volume production or tight tolerance components, hardened or corrosion-resistant steel may be the better investment. Our quotation explains the recommended steel choice so you understand both cost and performance.
Injection Mold Steel Selection Guide
This guide explains common injection mold steels, how they are selected, and what information CKMold needs to recommend a suitable tooling solution for your plastic part.
What Are Plastic Mold Steels?
Plastic mold steels are tool steels designed to handle pressure, heat, wear and repeated molding cycles. They must be machinable enough for accurate mold making and durable enough to keep part dimensions stable during production.
CKMold evaluates mold steel based on your plastic resin, part geometry, surface finish, production volume and budget. The goal is not always to choose the most expensive steel. The goal is to choose the steel that fits your mold life and production risk.
Key Characteristics of Plastic Mold Steels
When selecting mold steel, CKMold reviews the properties that matter most for injection molding performance:
- Hardness and wear resistance: important for long mold life and abrasive plastics.
- Polishability: required for transparent parts or high-gloss surfaces.
- Corrosion resistance: useful for PVC, flame-retardant plastics and humid production environments.
- Machinability: affects tooling lead time and cost.
- Toughness: helps reduce cracking and damage on complex mold structures.
- Heat treatment stability: important for dimensional accuracy after hardening.
How to Select the Right Injection Mold Steel
Choosing mold steel is a balance between cost, cycle life and part requirements. CKMold considers the following factors before making a recommendation:
- Expected annual production volume and mold life
- Part size, wall thickness, ribs, undercuts and complexity
- Plastic material, fillers and additives
- Surface finish, texture and polishing requirements
- Dimensional tolerance and assembly function
- Cooling, ejection and maintenance needs
Common Steel Types Used for Injection Molds
P20 is widely used for general injection molds because it offers a good balance of machinability, hardness and cost. For higher mold life, abrasive plastics, transparent parts or corrosive materials, CKMold may recommend steels such as H13, S136, 718, NAK80 or other tool steels depending on the application.
We do not treat steel selection as a generic checkbox. The mold material should match the resin, production volume and quality expectations of your project.
🔍 Comparison of Common Mold Steels (Used by CKMOLD)
| Mold Steel | Hardness (HRC) | Key Properties | Typical Applications | Suitable Plastic Materials |
|---|---|---|---|---|
| S50C | 19–22 HRC | Medium carbon steel with good wear resistance; reduced ductility | Mold bases, trial molds, low-volume production | PP, PE, ABS, rubber, soft plastics |
| P20 | 30–36 HRC | Excellent machinability, good polishability, affordable | Injection molds, blow molds, extrusion tools | PP, PE, ABS, PS, PA, rubber |
| 2738 | 29–33 HRC | Good polishability and processing stability | Polished surface molds | PP, PE, ABS, PS, PA |
| 718H | 34–38 HRC | Pre-hardened; excellent polishability and wear resistance | High-finish part molds, blow molds | PA, POM, PS, PE, PP, ABS, PBT |
| NAK80 | 37–43 HRC | Good for high-gloss and transparent parts; easy to machine | Transparent molds, mirror-polished tools | PC, PMMA (acrylic), optical plastics |
| 2083 | 48–52 HRC | Corrosion-resistant, wear-resistant, good machinability | Corrosive material injection molds | PVC, POM |
| 2344 (H13 equivalent) | 48–52 HRC | Excellent toughness, heat resistance, polishability | Engineering plastics, inserts for PA+GF/CF | PA+GF, PA+CF |
| H13 | 50–54 HRC | Hot-work die steel; wear and heat resistant | High-temp molding, die casting, inserts | PAI, PEEK, LCP, PEI, PPSU |
| S136 | 48–54 HRC | Premium polishability, high corrosion resistance | Transparent parts, corrosive resins | PC, PMMA, POM, PVC, medical-grade resins |
💡 Notes from CKMOLD Experts:
Need mirror finish? Choose NAK80 or S136.
Handling corrosive plastics? Go with 2083 or S136.
Molding glass-filled or high-temp plastics? We recommend 2344 or H13.
Working with large molds or high output? P20 and 718H offer excellent cost-performance ratio.
How CKMold Chooses Tool Steel for Your Mold
CKMold chooses tool steel by looking at the full project, not only the mold price. A low-cost steel may be suitable for a short-run tool, while a hardened steel may reduce long-term risk for a production mold. During quotation, we can explain the steel option, expected mold life and maintenance considerations.
SPI Mold Classification and Design Standards
CKMold can build molds according to common SPI mold classifications, from prototype tools to high-volume production molds. These classifications help define mold life, steel selection, mold base requirements, wear components and expected production performance.
🥇 Class 101 Mold – Ultra High Volume (1,000,000+ cycles)
CKMOLD High-Performance Tooling for 24/7 Production
Complete 3D/2D mold structure drawings required
Mold base: Minimum hardness of 28 HRC
Cavity and core: Minimum hardness of 52 HRC (e.g., H13, S7)
All moving and wear components (ejector pins, lifters, slides, etc.) must be hardened
Guided ejection system required
Slides must include wear plates or inserts
Positive parting line locks to ensure alignment during high-speed production
Comprehensive cooling systems designed into cavities, cores, and slides
Components exposed to cooling water should use stainless materials (e.g., S136) or have anti-corrosion treatment to prevent rust and reduce maintenance
🥈 Class 102 Mold – High Volume (≤ 1,000,000 cycles)
Built for durability, moderate complexity, and long service life
Full mold structure drawings required
Mold base: Minimum hardness 28 HRC
Cavities/cores: At least 48 HRC
All wear-prone areas must be properly heat treated
Efficient cooling lines should be embedded in all plastic-contact areas
Parting line locks recommended for mold alignment and life extension
🥉 Class 103 Mold – Medium Volume (≤ 500,000 cycles)
Cost-effective tooling for mid-range production
Mold structure drawings required
Mold base: Minimum 15 HRC
Cavities/cores: Minimum 38 HRC
Wear components optional depending on application and part tolerance requirements
Suitable for consumer products and non-cosmetic parts with moderate lifespan
🔹 Class 104 Mold – Low Volume (≤ 100,000 cycles)
Pilot or low-volume tooling at minimized investment
Basic mold drawings required
Mold base can be made from mild steel
Cavities/cores: Minimum 15 HRC, usually pre-hardened steels like P20
Suitable for pre-production runs, marketing samples, or secondary part development
🔸 Class 105 Mold – Prototype Use (≤ 500 cycles)
Rapid tool for concept validation or fit-testing
Constructed using low-cost materials such as aluminum, cast metal, or epoxy
Not suitable for production; intended for short-term use only
Quick turnaround, low tooling cost — ideal for design verification
📩 Need help selecting the right SPI mold class for your project? Talk to CKMOLD’s Engineering Team — we’ll recommend the best solution based on your part geometry, plastic type, and production targets.
Injection Mold Pricing and Quotation
Clear pricing starts with clear project information. CKMold prepares injection mold quotations based on part complexity, mold structure, steel selection, cavity number, tolerance, finish and production requirements.
Understanding Injection Mold Pricing
The cost of a custom injection mold depends on part size, mold complexity, steel grade, cavity number and production volume. A simple low-volume single-cavity mold may cost much less than a hardened multi-cavity production mold with sliders, lifters, tight tolerances and polished surfaces.
Instead of giving a one-size-fits-all price, CKMold reviews your part files and explains the main cost drivers in the quotation.
How Much Does a Custom Injection Mold Cost?
At CKMOLD, injection mold pricing varies depending on the mold complexity, size, and production volume requirements.
A simple, single-cavity mold designed for low-volume production typically ranges from $1,000 to $3,000.
More complex molds for larger parts or multi-cavity designs can cost $10,000 or more.
On average, a standard mold producing a straightforward part roughly the size of a handheld item usually costs around $5,000.
Understanding these estimates highlights the importance of early design planning and optimization, which can significantly reduce tooling costs and accelerate your time to market.
Factors That Influence Injection Mold Cost
Injection mold cost can vary widely. CKMold considers these key factors when preparing a mold quotation:
| Factor | Impact on Cost |
|---|---|
| Mold Size & Complexity | Larger and more intricate molds require more materials and labor, increasing overall costs. |
| Mold Steel Material | Higher-grade steels (e.g., hardened tool steels) cost more than mild steel or aluminum alternatives. |
| Mold Design | Number of cavities, gate locations, ejector pins, and complexity of design all affect pricing. |
| Production Volume | High-volume molds are engineered for durability and longevity, resulting in higher upfront costs but lower cost per part. |
| Manufacturing Location & Supplier | Labor and material costs vary by region; molds produced in China typically offer competitive pricing without compromising quality. |
| Additional Features | Hot runner systems, advanced temperature controls, and automation increase mold complexity and cost. |
Providing detailed and accurate information about your project and working closely with CKMOLD’s experienced team helps us deliver precise, fair, and competitive mold pricing tailored to your needs.
How to Get an Accurate Injection Mold Quote
To receive a faster and more accurate injection mold quotation, send as much project information as possible. Even if your files are not complete, CKMold can still review the part and tell you what is missing.
1. 📄 Provide Detailed Part Specifications
Clearly describe your part:
Function and usage scenario
Overall dimensions and geometry
Material to be used (e.g., PP, ABS, PC)
Target quantity and delivery schedule
2. 🛠 Clearly Define Mold Requirements
Let us know your mold preferences:
Mold type: Hardened steel, Pre-hardened steel, or Aluminum
Surface finish: Polished, Textured, Etched, etc.
Special features: Cooling channels, Hot runner, Ejector system, etc.
3. 📊 Share Your Expected Production Volume & Timeline
Inform us about:
Estimated annual production volume
Mold lifespan expectations
Any production milestones or deadlines
4. 🧩 Submit Mold Design Files
Provide 3D CAD files (preferably in STEP/STP, IGS, or X_T format)
If available, include 2D drawings with tolerances
Let us know your preferred design software, if applicable
5. 📏 Provide Accurate Part Dimensions and Tolerances
Include any critical tolerances or assembly requirements
Inform us of shrinkage factors, insert areas, and undercuts
6. 💬 Request a Comprehensive Quote
We will provide a detailed quotation that includes:
Mold design and manufacturing cost
Tooling components (e.g., inserts, sliders, ejector system)
Sample or T1 part cost
Optional extras (e.g., texturing, special steel, shipping, maintenance plans)
7. 🧾 Review and Clarify the Quote
Ensure all requested items are covered
Ask if anything is unclear—we’re here to help
8. 🧪 Request a Prototype or Sample (Optional)
We can offer rapid prototypes or T1 samples to validate your design before mass production.
9. 🤝 Negotiate Terms (if needed)
We’re flexible and open to discussing pricing terms, delivery schedules, or technical adjustments.
10. ✅ Evaluate CKMOLD as Your Manufacturing Partner
CKMOLD has over 20 years of experience in custom injection mold making
Proven track record with OEMs, engineering firms, and product developers globally
Expertise in a wide range of materials, tolerances, and international quality standards
6 Details CKMold Needs for an Accurate Mold Quote
For an accurate mold quote, CKMold usually needs six details: 3D CAD files, 2D drawings or tolerance notes, plastic material, expected production volume, surface finish or texture, and any assembly or functional requirements.
The clearer the input, the more reliable the tooling recommendation, lead time and price will be.
What Is a Reasonable Cost for a Plastic Injection Mold?
A reasonable plastic injection mold cost depends on what the mold must achieve. Prototype tooling, low-volume tooling and production tooling have different steel, inspection and mold-life requirements.
As a general reference, simple single-cavity molds are usually the lowest-cost option, while high-precision, hardened, multi-cavity or complex-action molds require a larger investment. CKMold recommends treating mold price together with mold life, maintenance, cycle stability and part quality.
How to Choose the Right Injection Mold Manufacturer
When choosing an injection mold manufacturer, look for engineering communication, DFM capability, mold-making experience, clear quotation details, inspection support and export experience. A good supplier should help you understand design risks before cutting steel.
Why Are Injection Molds Expensive?
Injection molds are expensive because they require precision engineering, steel machining, EDM, fitting, polishing, heat treatment, trial molding and adjustment. The mold must repeatedly produce parts with stable dimensions and appearance, often under high pressure and heat.
The cost reflects not only steel and labor, but also the engineering work needed to make production reliable.
Plastic Injection Mold Manufacturing
CKMold turns part designs into production-ready injection molds through DFM review, mold design, CNC machining, EDM, fitting, assembly and mold trial. Our process is designed for customers who need clear communication and practical manufacturing support from China.
Injection Mold Manufacturing Resources
Learn how to source a reliable injection mold maker in China, how long mold manufacturing takes, what the mold-making process includes and how to evaluate mold life for your production plan.
How to Source a Plastic Injection Mold Maker in China
If you are sourcing a plastic injection mold maker in China, Guangdong is one of the most mature regions for tooling, machining and plastic molding supply chains. CKMold is based in Shenzhen and Dongguan, giving customers access to engineering support, mold manufacturing, molding trials and export coordination in one workflow.
How to Find a Reliable Injection Mold Factory
A reliable injection mold factory should be able to review your part design, explain tooling risks, recommend suitable steel, provide a clear quotation and communicate mold progress during machining and trial. CKMold focuses on transparency, practical engineering feedback and stable follow-up for overseas projects.
How to Evaluate Injection Mold Manufacturers
To evaluate an injection mold manufacturer, review their experience with similar parts, DFM capability, machining equipment, quality control process, communication speed and willingness to explain tradeoffs. The cheapest quotation is not always the best value if it increases production risk.
Experience and Industry Reputation
Experience matters because mold problems are often hidden in details: gate location, cooling, ejection, parting line, shrinkage, steel choice and assembly tolerance. CKMold uses project experience to identify these risks earlier and support better tooling decisions.
How Long Does It Take to Make a Plastic Mold?
Plastic injection mold lead time usually ranges from 2 to 8 weeks depending on mold size, complexity, steel, cavity number and trial requirements. Simple molds can move faster, while large or complex molds with sliders, lifters or high-polish surfaces need more time for machining and adjustment.
What Is the Injection Mold-Making Process?
The injection mold-making process usually includes drawing review, DFM feedback, quotation, mold design, steel preparation, CNC machining, EDM, drilling, polishing, fitting, assembly, T1 trial, sample inspection and mold adjustment. CKMold manages these steps with project updates so customers can follow progress clearly.
How Long Does an Injection Mold Last?
Injection mold life depends on steel grade, plastic material, production volume, maintenance and molding conditions. A prototype mold may be designed for short runs, while a production mold can be built for hundreds of thousands or more cycles when the right steel and structure are selected.
Free DFM Review and Mold Cost Optimization
CKMold offers practical DFM review and mold cost optimization before tooling starts. We can review wall thickness, draft angle, ribs, undercuts, gate location, ejection, steel choice and mold structure to reduce avoidable cost and improve manufacturability.
Send your drawings or samples and we will help identify the next best step for your injection mold project.