Injection molding, overmolding and metal stamping from a factory in Ninghai, Ningbo
Ningbo Haiming Electronics operates an export injection molding, rubber overmolding, and metal stamping facility in Ninghai, Ningbo. Established in 2008, the plant manufactures custom components directly to customer technical drawings, supported by an in-house toolroom and direct engineering coordination from our European desk in Cagliari, Italy.
Three primary manufacturing processes
All three processes operate in one plant, allowing combined metal and plastic assemblies without subcontracting delays.
Injection molding
Small and medium plastic components, produced with simple molds built in house.
Metal stamping
Precision hardware parts and custom metal stampings produced from coil strip.
Rubber overmolding
Rubber molded directly onto plastic or metal substrates.
Explore factory operations
Navigate through technical production parameters, facility history, quotation submission, and European engineering coordination.
Capabilities
About factory
Request a quote
Contact desks
What we do not make
Stating manufacturing limits plainly saves engineering time on both sides.
No large automated lines
LIMIT 01The facility operates equipment suited for small to medium batch sizes.
No die casting or extrusion
LIMIT 02The factory does not house heavy die casting presses or continuous plastic extrusion lines.
Typical order flow
A standard sequence from initial CAD evaluation to final export delivery.
Inquiry and drawing package
Customer submits 3D CAD files or 2D technical drawings with target quantities and resin specifications.
Drawing review and quotation
Toolmaker and engineers review part geometry, evaluate clamp requirements, and issue tooling and piece prices.
Commercial contract
Both parties confirm tooling payment terms, unit quantities, quality checkpoints, and export terms.
Tooling fabrication and first samples
Simple molds or stamping dies are cut in house, followed by sample pressing and critical dimension checks.
Sample inspection and customer approval
Samples undergo physical fit tests, assembly checks, and written customer approval.
Batch production and export shipment
Approved parts enter batch production and final packing inspection for export.
Direct European technical contact
European engineering teams coordinate directly with Isurus Works Studio in Cagliari, Italy. We review CAD files, clarify specifications, and manage communication across European working hours.
Core manufacturing processes and tooling
Direct engineering specifications for plastic injection, metal stamping, overmolding, and in-house mold machining.
Injection molding in China
Procurement guide for European engineering teams, mold ownership, quality gates, and ocean freight logistics.
Small-batch injection molding
Low-volume runs from 500 units upward with single-cavity tooling, master frames, and economical mold steels.
Rubber overmolding
Elastomer and TPE overmolding directly onto rigid plastic substrates or stamped metal inserts under one roof.
Metal stamping
Progressive dies and single step tooling for custom brackets, contacts, and inserts stamped from coil strip.
In-house mold making
On-site toolroom cutting mold steel, EDM, polishing, T1 trial shots, and lifetime tool maintenance.
Factory capabilities
Clamp force calculation, in-house tooling specifications, and customer supplied material procedures.
Engineering guides and European import standards
Practical DFM rules, polymer comparisons, customs compliance checklists, and mold cost amortization formulas.
How injection molding works
Detailed analysis of machine clamping, screw plasticizing, thermal cooling, and defect remedies.
Design guidelines & tolerances
DFM rules for wall thickness, draft angles, ribs, bosses, and DIN ISO 20457 tolerance classes.
Materials selection guide
Compare ABS, PC, PA, PP, POM, and TPE resins by strength, temperature, and EU compliance.
EU import compliance
Incoterms 2020, REACH SVHC declarations, RoHS certificates, customs duties, and ocean transit times.
Mold cost and lead times
Understand cavity counts, mold steels, slides, and trial schedules that set tooling budgets.
Request a quote & checklist
Send STEP 3D CAD files and drawings for engineering review, DFM feedback, and formal proposal.
Factory verification and European liaison desk
Corporate history, official Chinese business registrations, and English and Italian coordination from Cagliari.
Frequently asked questions about our factory
Clear answers regarding factory ownership, production capabilities, small batch quantities, and tooling terms.
Is this a factory or a trading company?
Production is by Ningbo Haiming Electronics Co., Ltd., a factory in Ninghai, Ningbo, operating since 2008. The European desk in Cagliari coordinates communication, not production.
What processes do you offer?
Plastic injection molding, rubber overmolding and metal stamping, with tooling made in-house.
Do you take small batches?
Yes, small batches are a stated focus; the practical minimum depends on part size, mold cost and material.
Who owns the mold?
Tooling terms are agreed in the quotation. The buyer owns paid tooling, and storage and maintenance terms are agreed in the contract.
How do I request a quote?
Send drawings or 3D files (STEP), material, annual volume, target price and certificates required. Use the RFQ checklist on /quote.
Ready to review your part drawings?
Send 3D files and quantities. We calculate mold costs and unit prices based on part geometry.