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

Holly – your dependable partner for high-precision plastic injection molding in China! With over 20 years of industry experience, Holly combines technical innovation, advanced manufacturing, and responsive service to deliver customized injection molded parts for industries including automotive, medical devices, smart electronics, household appliances, and industrial equipment.

As a leading China plastic injection mold manufacturer, Holly offers a fully integrated service—from DFM support and in-house mold design to plastic injection molding, insert molding, assembly, and final quality assurance. Whether you’re launching a new product or scaling up existing production, we can turn your 3D CAD files into functional components in just a few weeks.

Advanced In-House Mold Making

Our dedicated tooling workshop features high-precision CNC machines, EDM, and surface grinders, enabling us to build complex molds for tight-tolerance parts, multi-cavity systems, and family molds. Holly controls the entire tooling lifecycle—from steel selection to maintenance—ensuring both tooling durability and product consistency.

Flexible Molding Capabilities

We operate more than 40 injection molding machines, with clamping forces from 80 to 1000 tons, capable of producing batches from 50 to 100,000+ pieces. We support a wide range of thermoplastics, including ABS, PP, PC, PA, POM, and high-performance resins like PEEK. Whether you require functional prototypes or full-scale production, we deliver with speed and precision.

Engineering Support You Can Rely On

Our team of 10+ experienced molding engineers, with knowledge drawn from both Taiwanese and European practices, works closely with clients to optimize part design, flow channels, and gate systems. We specialize in both standard injection molding and insert molding—ensuring strong bonding, minimal warpage, and high structural integrity.

Reliable Delivery & Global OEM Support

Holly has successfully served over 500 international clients, offering rapid mold sampling in 7–10 business days and volume production completed within 2–3 weeks. Our ISO 9001-certified quality system ensures traceable, defect-free production, and our export logistics team ensures timely global delivery.

Whether you need tight-tolerance housings, overmolded inserts, or large-batch plastic components, Holly is the China plastic injection mold manufacturer you can trust, offering scalable solutions, technical depth, and responsive service to help you accelerate product development and stay competitive.

Reviews from Our Plastic Injection Molding

Holly handled our tight-tolerance ABS housing project with exceptional professionalism. From DFM review to production, everything was clearly communicated and delivered right on time.

Jason H.

The insert molding work we ordered required precise metal alignment, and Holly executed it flawlessly. Every part fit perfectly into our downstream assembly without rework.

Michelle K.

We were impressed with Holly’s ability to deliver functional samples within just 7 days. Their engineering suggestions also helped us reduce unnecessary wall thickness and improve flow.

Leo W.

This team knows what they’re doing. We submitted a complex multi-cavity mold design, and Holly provided valuable tooling advice and delivered perfect first shots.

Amanda R.

Holly’s communication is outstanding. We received weekly progress updates and detailed QC reports, which helped us stay aligned with internal milestones.

Victor T.

Our POM parts came out with excellent dimensional consistency across the entire 20,000-unit batch. Surface finish was clean and completely free of flash.

Elaine C.

I appreciated how Holly handled our low-volume trial run with the same care and responsiveness as a large order. The parts were packaged well and met all our specs.

Brian F.

Their tooling department is truly efficient. We needed a two-plate mold for fast-cycle production, and Holly had it designed, built, and tested in under two weeks.

Natalie S.

We ordered flame-retardant PC enclosures for a smart home device, and Holly delivered consistent quality with full certification support. Definitely a supplier we’ll keep using.

Marcus Y.

Holly helped us resolve venting issues we had with a previous supplier. Their mold flow analysis and gate placement strategy made a huge difference in final product quality.

Irene L.