Custom Plastic Injection Molding – Best China Injection Molding Supplier, Manufacturer

Welcome to Holly – your trusted partner for precision plastic injection molding in China! With over 20 years of experience and a strong technical foundation, Holly delivers reliable and high-quality custom molded parts for diverse industries, including automotive, medical devices, smart electronics, household appliances, and industrial systems.

As a full-service China injection molding supplier, Holly provides a complete range of services from DFM consultation, mold design, and fabrication to injection molding, assembly, and quality inspection. Whether you need 50 or over 100,000 parts, we scale flexibly to meet your production goals—turning your 3D CAD designs into functional parts within just a few weeks.

Advanced Manufacturing Capabilities:

Our factory houses more than 40 injection molding machines ranging from 80 to 1000 tons. We support a wide range of plastic types, including commodity resins like ABS and PP, and engineering-grade materials such as POM, PA, PC, and PEEK. Our process integrates CNC machining, EDM tooling, and automated workflows to ensure precision and repeatability at every stage.

Engineering Expertise:

With a team of 10+ senior molding engineers who have collectively handled thousands of custom projects, we apply advanced molding techniques absorbed from Taiwan and Europe. Our team collaborates closely with clients to refine part geometry, optimize gate and runner systems, and ensure reliable mold performance for long-term use.

Family Mold & Custom Solutions:

Holly specializes in multi-cavity and family mold tooling—helping clients reduce cost per part and streamline multi-component assembly workflows. From early-stage prototypes to mass production, we ensure fast lead times with mold sampling in 7–10 days and production batches shipped within two weeks.

Global Clients, Local Precision:

Having served hundreds of international brands and OEMs, Holly is known for responsive support, stable delivery, and high-quality output. Whether you’re building smart device housings, healthcare components, or structural plastic assemblies, we are here to bring your ideas to life with scalable and dependable injection molding solutions from China.

Reviews from Our Plastic Injection Molding

We needed complex PC parts for our industrial equipment project, and Holly delivered beyond expectations. Their tooling precision and consistent batch quality helped us speed up assembly without additional adjustments.

Robert Nilsson

Holly’s team helped us convert a rough 3D concept into mass-produced components within three weeks. The collaboration was fast, technical, and very smooth—exactly what we needed as a hardware startup.

Chloe Martinez

Our company has worked with several suppliers in China, but Holly stands out for their deep engineering insight and process stability. Their DFM feedback prevented multiple costly design mistakes.

Anurag Mehta

We ordered a family mold for three interrelated parts used in medical packaging. Holly not only reduced our tooling budget significantly but also maintained outstanding dimensional control across all parts.

Hannah Brooks

Holly delivered 10,000 nylon parts with extremely tight tolerances and high cosmetic quality. We especially appreciated the automated QC reports they sent after each batch. Very professional.

Lucas Berthier

Communication with Holly has been excellent from day one. Their sales and engineering teams are very responsive and knowledgeable. We always feel like our projects are in capable hands.

Mika Kondo

We were looking for a china injection molding supplier that could handle flame-retardant plastics and complex mold flows—Holly delivered both performance and safety compliance. Highly recommend.

Ben Halvorsen

For our automotive clips project, we requested a high-output multi-cavity tool. Holly’s tooling quality was top-notch, and their lead time was better than any supplier we’ve used before.

Fatima El-Khatib

Our first order was a small batch of 500 parts, but Holly treated it with full attention and gave us insights to improve part strength. Now we’ve scaled to monthly production with them.

Diego Navarro

Holly is not just a manufacturer—they’re a technical partner. From mold steel selection to venting strategy, their team provided critical support that helped us avoid common molding defects.

Grace Li