Custom Plastic Injection Molding – Best Plastic Injection Molding manufacturer, Supplier in China

Welcome to Holly – your dependable partner for plastic injection molding in China! With more than 20 years of experience, Holly delivers high-performance, cost-effective plastic molding solutions for industries such as automotive, smart electronics, household appliances, medical devices, and industrial machinery.

As a leading supplier of plastic injection molding China, Holly offers a complete one-stop service—from early-stage product development and mold fabrication to injection molding, assembly, and post-processing. Whether your project involves micro-precision parts or large structural components, we provide stable, scalable production with rapid turnaround and stringent quality control.

In-House Mold Making Expertise

Our internal tooling workshop is equipped with advanced CNC machining centers, EDM systems, and precision grinding equipment. We design and build single-cavity, multi-cavity, and family molds, with special focus on steel durability, cooling performance, and cycle efficiency, ensuring consistency across tens of thousands of cycles.

Comprehensive Molding Capacity

With over 40 injection molding machines ranging from 80T to 1000T, Holly is capable of producing both small and large parts in a wide variety of thermoplastics, including ABS, PP, PA, PC, POM, and high-performance materials such as PEEK and glass-filled nylon. Our flexible production setup supports both low-volume prototypes and mass production, with mold sampling available in just 7–10 working days.

Engineering-Led Manufacturing

Our team of 10+ experienced molding engineers works closely with each client to provide DFM support, mold flow analysis, material recommendations, and optimized gating and cooling strategies. For parts with complex geometries or tight tolerances, we help minimize defects such as sink marks, warping, or dimensional drift through engineering-driven refinement.

Global Delivery & ISO-Certified Quality

We’ve served more than 500 global clients, providing full ISO 9001-certified quality control, batch-level traceability, and professional export logistics. Whether you’re manufacturing high-volume functional enclosures, integrated assemblies, or high-spec technical parts, Holly ensures production accuracy, consistency, and on-time delivery worldwide.

If you’re sourcing reliable plastic injection molding China solutions for your next project, Holly is here to deliver tooling precision, engineering depth, and production scalability—bringing your ideas into reality with efficiency and expertise.

Reviews from Our Plastic Injection Molding

Holly is our go-to supplier for plastic injection molding in China. Their parts always arrive on time, properly packaged, and meet our specifications without the need for post-processing.

Richard T.r

The DFM support we received from Holly was incredibly detailed. Their engineers helped us reduce unnecessary wall thickness and improve moldability without compromising performance.

Angela M.

We’ve worked with several Chinese molders, and Holly stands out for their consistency. The finish and dimensional accuracy across our 15,000-unit batch were outstanding.

Bryan S.

Our enclosure parts involved tight tolerances and internal snap-fits. Holly nailed the fit on the first round of samples. That saved us weeks in development.

Karen L.

What impressed us most was their ability to deliver mold samples within 8 working days. The lead time and quality gave us a huge advantage in launching our pilot product.

Joseph K.

We had a complex part with undercuts and variable wall thickness, and Holly’s team recommended a slider-based mold that worked perfectly. They clearly know their tooling.

Emily W.

Communication was fast and clear, even with multiple revisions to our drawings. Holly remained flexible and professional throughout the process.

Daniel H.

We needed a mold capable of producing 100,000+ parts over time. The tooling Holly built has been running smoothly for over a year now with very little maintenance required.

Tina Y.

The POM parts we ordered had to meet specific functional tolerances for a valve system. Holly delivered consistent results across three separate batches.

Albert G.

This team understands Western quality expectations. Their reports, packaging, and part consistency gave us full confidence to use them as a long-term supplier.

Monica R.