Manufacturing Your Ideas
Private & Precise
- ✓Factory-Direct Manufacturing, Faster to Respond
- ✓Clear production updates and inspection records
- ✓24/7 expert support, with free DFM services
- ✓Fully certified, On-Demand Testing
- ✓Low MOQ, start small and scale fast
10+
Years in Business
800K
Pcs / Month
70%+
Repeat Clients
98%
On-Time Delivery
ISO
9001 · BSCI
HM Manufacturing has achieved an on-time delivery rate of up to 98% for more than 3,600 customers
HM Manufacturing Provides End-to-End Contract Manufacturing for Custom Plastic Parts
HM Manufacturing has its own factory in Taizhou, China. Our custom manufacturing capabilities cover mold design & DFM, injection mold tooling, custom injection molding, CNC machining, 3D printing and rapid prototyping, with overmolding and insert molding for complex parts. Whether you need rapid prototyping, a low-MOQ launch or high-volume production, we are your trusted partner for complex custom plastic parts, delivering on speed, precision and reliability
Mold Design & DFM
Free written DFM report with every quote, covering wall thickness, draft, gates, undercuts and shrinkage before steel is cut
DFM report24 hoursDraft angle≥ 0.5°Wall reviewed0.031–0.118"CostFree with tooling
Precision CNC Machining
3-, 4- and 5-axis milling and turning for mold cores, cavities, electrodes and one-off metal or plastic parts
Tolerance± 0.001"Min wall0.020"Surface finishRa 32 µinLead time3–7 days
Injection Mold Tooling
Tooling in P20, 718H, S136 and H13 steel with multi-cavity balancing for stable repeat production
Cavity tolerance± 0.0008"Cavities1–64T1 samples30–50 daysMold life300K–1M shots
Rapid Prototyping
Validate fit, function and material before you commit to tooling, with 3D printing, CNC and bridge tooling under one roof
Lead time3–10 daysQuantity1–500 pcsTolerance± 0.001–0.004"ProcessesSLA/SLS/MJF/CNC
3D Printing
Functional prototypes and end-use parts in SLA, SLS and MJF, shipped in as fast as three days
Tolerance± 0.004"Min wall0.031"Lead time3 daysQuantityFrom 1 pc
Custom Injection Molding
Volume production in food-grade and engineering resins, one tool scaling from 500 to 1M+ units without retooling
Part tolerance0.0012–0.002"Wall thickness0.020–0.157"Lead time15–25 daysMOQ500 pcs
Overmolding
TPE and TPU over ABS, PC and nylon for soft-touch grips, seals, cable assemblies and electronic housings
Shore hardness30–90 AMethod2-shot / insertT1 samples35–45 daysMOQ500 pcs
Insert Molding
Brass and stainless inserts, threaded bushings and metal contacts molded into plastic in one shot
Insert position± 0.002"Insert sizeM2–M12T1 samples35–45 daysMOQ500 pcsChoose how to start your manufacturing project
Concept Review
No drawings yet? Share your idea, reference images and intended use with our engineering team to discuss the next design and manufacturing steps
Discuss Your ConceptInjection Molding Case Studies by Industry
From earbud cases and smart devices to automotive lamps, home appliances, impellers and drones, here is how we solve the molding problems each industry cares about most
Precision Housings with IML Finishes for Power Banks and Smart Devices
Earbud cases, power banks and smart-home devices are handled every day, so their housings have to fit precisely, look premium and stay that way. We mold precise plastic housings and apply In-Mold Labeling (IML), sealing logos, colors and textures under a protective film so the finish resists scratches and wear instead of rubbing off like printed or sprayed decoration
Your Contract Manufacturing Partner in China, First Samples in 3 Days
HM Manufacturing is headquartered in Taizhou, China, with mold making and injection molding run in our own factory and backed by a vetted network of 500+ partner factories across China, delivering high-quality, on-demand manufacturing for custom plastic parts. As your strategic partner, we ship to North America, Europe and beyond, with 3D-printed samples ready in as fast as 3 days. Our English-speaking project team keeps communication clear across time zones, so your production stays efficient, reliable and on schedule
Follow Your Project from Tooling to Delivery
Our team coordinates tooling, molding and delivery, sharing production updates and inspection records at agreed project milestones. Contact your project manager to review progress, discuss schedule changes and confirm the documentation your order requires
See where your order stands at every stage. We share production updates and high-resolution inspection photos, so you always know what is being made and how it looks before it ships
- Track progress for each SKU and order
- High-resolution inspection photos for quality assurance
- Proactive updates on any delay or deviation
- Material certificates and test reports on request
Because we own the mold shop and the injection plant, we schedule your job on our own lines and adjust priority when your timeline changes
- Core tooling and molding on our own lines
- Flexible reprioritization when deadlines shift
- Low MOQ, confirmed per project
- Reliable on-time delivery you can plan around
Go beyond molding. We make your core parts in-house, then integrate assembly, packaging, and accessories through a vetted network of 500+ partner factories, so you source your whole product from one team instead of juggling many suppliers
- In-house injection molding as your quality baseline
- Vetted partner factories for assembly and accessories
- One-stop sourcing for parts, packaging, and kitting
- One team accountable from tool to finished product
Validate your product before you commit to a tool. Our free DFM review flags molding risks early, and 3D printed samples let you check fit, feel, and function, cutting rework, waste, and time to market
- Free DFM review before tooling starts
- 3-day 3D printed samples to verify fit and function
- Defect optimization and co-creation feedback
- LFGB and FDA food-grade materials verified up front
How to Work With HM Manufacturing
STEP 01
Share Your Project
Send your CAD file, drawing or product idea with the material and quantity
STEP 02
DFM Review & Quote
Free DFM review in 4 hours and a firm quote in 24 hours, with the recommended process and tooling plan
STEP 03
Sample, Production & Delivery
Approve samples, then we produce, inspect and ship your finished parts
End-to-End Solutions for New Product Development
HM Manufacturing delivers full-cycle product development, from design and prototyping through mass production to packaging. We help innovative brands worldwide bring products to market easier and faster, with fewer handoffs and complete control at every stage
Project Initiation & Design
From concept to manufacturable design, our team helps global brands turn ideas into ready-for-prototyping solutions
Quality Control and Compliance for HM Custom Manufacturing
At HM Manufacturing, quality is controlled at the mold design stage. It starts with a DFM review, where our engineers settle wall thickness, gate location and shrinkage before any steel is cut. Communication stays efficient and transparent through the whole project. Cavity tolerances are held within ±0.02 mm and molding tolerances within 0.03-0.05 mm, under ISO 9001 certified processes. More than 70% of our clients choose to work with us again
Advanced Inspection Equipment
We use CMM, 2D vision measuring systems, portable measuring arms, height gauges, micrometers and calipers to check part dimensions, mold cavity dimensions and surface finish, holding molding tolerances at 0.03 to 0.05 mm and cavity tolerances within ±0.02 mm
Comprehensive Inspection Documentation
We provide detailed inspection reports such as first article inspection (FAI), dimensional measurement reports, material certificates, RoHS and REACH test reports, and pre-shipment inspection records to support your quality management
Certified Manufacturing Partner
Certified to ISO 9001, IATF 16949, ISO 14001 and BSCI, with LFGB and FDA documentation provided per project for food-contact parts. We supply industries with strict quality requirements, including automotive, medical devices, consumer electronics and e-commerce brands
HM Manufacturing FAQs
Start with a free DFM review. We review part geometry, material, manufacturability and tooling risks, then identify the next engineering step before tooling or production
Send your available CAD files, drawings or sample information, together with the material, quantity, finish and application. We review the requirements and confirm the recommended manufacturing route, quotation and project schedule
MOQ is project-specific. We support low-MOQ runs and confirm the minimum after reviewing the part size, material, process, tooling and packaging requirements
You do. The custom mold you pay for and your product design remain yours
Yes. We support DFM, 3D printing and rapid prototyping, mold design and tooling, injection molding, CNC machining, and production delivery based on project requirements
Yes, according to project requirements. We can provide material certificates, RoHS, REACH and relevant test reports for applicable materials and projects