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Buyer's guide

Plastic Injection Molding & CNC Machining Services from China — A Contract Manufacturing Buyer's Guide

Sourcing guide for plastic injection molding and CNC machining contract manufacturing services from China. Mold tooling, prototype to mass production, ISO 13485 medical, IATF 16949 automotive. Real images from Kemal Manufacturing.

Information notice: the details below were compiled from published supplier material and buyer correspondence. Specifications, MOQ, lead times and pricing change — confirm every figure with the supplier before you order.

Product range — actual catalogue images

The product images below are hosted on the manufacturer's official website (kemalmfg.com) and link directly to the manufacturer's catalogue. Click any image to view the full specification page in a new tab.

Clean-room class injection mold tooling — multi-cavity steel mold for medical-grade and high-precision plastic parts.

Plastic injection molding production floor — automated multi-machine production with HETINC and DINVO branded equipment.

Rapid prototyping via CNC machining — aluminum impeller machined on multi-axis CNC for prototype validation.

CNC machining production — precision metal parts machined to spec with ISO 9001 / ISO 13485 quality standards.

Service portfolio overview

ServiceDescriptionTypical applicationsPricing model
Injection mold toolingMold design, manufacture, validationProduction tooling for plastic partsUSD 3,000-150,000 per mold
Plastic injection molding productionHigh-volume part productionConsumer products, medical, automotiveUSD 0.05-15.00 per part (volume-dependent)
CNC machining (3-axis)Standard milling and turning operationsPrototype and low-volume metal partsUSD 1.50-45.00 per part (size/complexity)
CNC machining (5-axis)Complex geometry single-setup machiningAerospace, medical, complex prototypesUSD 8.00-180.00 per part
Rapid prototyping (CNC)Fast turnaround machined prototypesDesign validation, fit testingUSD 50-1,500 per prototype + shipping
Rapid prototyping (3D print)SLA, FDM, SLS for prototype partsForm/fit validation, concept modelsUSD 25-450 per prototype
Vacuum casting (urethane)Low-volume polyurethane parts from silicone mold10-50 piece bridge productionUSD 25-380 per part + tool USD 350-2,500
Sheet metal fabricationLaser cutting, bending, weldingEnclosures, brackets, custom assembliesUSD 5-280 per part
Die castingAluminum/zinc/magnesium pressure die castingHeat sinks, automotive, consumer hardwareUSD 0.50-25.00 per part + tool USD 8,000-95,000
Post-processingPainting, plating, anodizing, EMI shielding, assemblyProduction-ready finished partsPer-process pricing

Injection mold construction tiers

The wrong mold tier creates expensive operational issues: (1) UNDER-SPECIFIED MOLDS — fail prematurely, requiring expensive re-tooling mid-production; (2) OVER-SPECIFIED MOLDS — inflate initial capital cost without proportional benefit. Match mold tier to expected production volume: under 50,000 parts lifetime → prototype/bridge mold; 50K-500K → standard P20; 500K-1M → premium H13; >1M → mass-volume tier with hot runner. For uncertain demand, P20 standard is often the right balance — it can handle 200-500K parts adequately while staying affordable. For medical/food-contact applications, S136 stainless is mandatory regardless of volume due to corrosion-resistance requirements. Reputable mold makers like Kemal Manufacturing recommend tier based on customer's actual volume forecast and application requirements.

Mold tierSteel gradeProduction lifetimeBest applicationsCost premium vs base
Prototype mold (aluminum)Aluminum 7075500-5,000 shotsValidation prototypes only30-50% of P20 cost
Bridge production moldP20 pre-hardened50,000-300,000 shotsInitial market launch, low-volume productionBase reference (100%)
Standard production moldP20 + hardened inserts200,000-500,000 shotsConsumer products, mainstream production+15-30% over P20 base
Premium production moldH13 hardened tool steel500,000-1,500,000 shotsAutomotive, high-volume consumer+40-60% over P20 base
High-precision moldS136 stainless / DC53500,000-1,000,000 shotsMedical, optical, food-contact, electrical+50-80% over P20 base
Mass-volume moldH13 + multi-cavity hot runner1,000,000+ shotsMassmarket consumer, packaging+80-150% over P20 base

Material selection for plastic injection

MaterialPropertiesCommon applicationsCost ratio vs ABS
ABS (acrylonitrile butadiene styrene)General-purpose, good impact, easy to moldConsumer products, electronics housings, automotive interior1.0× (baseline)
PP (polypropylene)Chemical resistance, lightweight, food-safeContainers, automotive, appliance components0.7-0.9×
PC (polycarbonate)Optical clarity, high impact resistanceLenses, electronic enclosures, automotive lighting1.5-2.0×
PC/ABS blendCombined strength + impact + processabilityPremium consumer electronics, automotive interior1.3-1.8×
HDPE / LDPEChemical resistance, low costPackaging, containers, plumbing0.5-0.8×
POM (acetal / Delrin)Low friction, high stiffness, dimensional stabilityGears, bearings, mechanical parts1.6-2.4×
Nylon (PA6, PA66)Tough, heat-resistant, can be glass-filledAutomotive under-hood, mechanical parts1.4-2.2×
PEEK (polyetheretherketone)Premium engineering plastic, high temp/chemical resistanceAerospace, medical implants, semiconductor30-80×
PEI (polyetherimide / Ultem)Inherent flame resistance, high temperatureAerospace, medical, electrical insulation15-40×
TPU / TPE (thermoplastic elastomer)Soft, flexible, rubber-likeGrips, seals, soft-touch surfaces1.2-1.8×
Medical-grade PC / PEUSP Class VI, FDA-compliantMedical devices, drug delivery2.0-3.5×

Quality certifications and applications

CertificationApplication areaRequired for
ISO 9001:2015General quality managementMost B2B contract manufacturing
ISO 13485:2016Medical device quality managementMedical device contract manufacturing
IATF 16949Automotive quality managementAutomotive Tier-1 / Tier-2 supply
AS9100DAerospace quality managementAerospace contract manufacturing
ISO 14001Environmental managementSustainability-focused customers
FDA registrationMedical device manufacturingFDA-regulated medical products
USP Class VIBiocompatibility (plastics for medical)Medical implants, drug delivery contact
UL listingElectrical safetyElectrical/electronic enclosures
FCC certificationElectromagnetic compatibilityElectronic products with RF emission
CE markingEU market accessMost products entering EU
RoHSRestricted substancesEU and most international electronics

Pricing brackets — typical contract manufacturing

Customer typeAnnual production volumeTypical contract structure
Startup / prototype validation100-2,000 partsPer-order pricing; CNC machining or short-run molding
Bridge production / Kickstarter2,000-50,000 partsBridge mold + production; per-part discount with volume
Mid OEM / consumer products50,000-500,000 partsStandard P20 mold + per-part production; 6-12 month forecast
Medium OEM500,000-2 million parts/yearPremium mold + framework agreement; quarterly reviews
Tier-1 / mass production2+ million parts/yearMulti-cavity hot-runner mold + dedicated production line

Order workflow — contract manufacturing engagement

View the full supplier profile, certifications, contact details, and complete product catalogue.

Kemal Manufacturing (China) — contract manufacturer specializing in plastic injection molding and CNC machining services. Plastic injection molding: medical-grade clean-room (ISO 13485 certified), automotive Tier-2/3 (IATF 16949), high-volume consumer products. Mold tooling: aluminum prototype molds (500-5,000 shots), P20 pre-hardened production molds (50K-300K shots), H13 hardened premium molds (500K-1.5M shots), S136 stainless precision molds for medical/optical/food-contact, multi-cavity hot-runner mass-volume tooling. CNC machining: 3-axis and 5-axis mills, multi-spindle CNC turning, EDM (sinker and wire). Rapid prototyping: CNC machined prototypes, SLA/FDM/SLS 3D printing, urethane vacuum casting (10-50 piece bridge production). Sheet metal fabrication, die casting (aluminum/zinc/magnesium), post-processing (painting, plating, anodizing, EMI shielding, assembly). Materials: full range of plastics (ABS, PP, PC, PC/ABS, HDPE, POM, Nylon, PEEK, PEI, TPE/TPU, medical-grade) plus standard metals (aluminum, stainless steel, brass, titanium). Certifications: ISO 9001, ISO 13485, IATF 16949 capability, ISO 14001.

  • Design submission — provide 3D CAD files (STEP, IGES, or native format), 2D drawings with critical dimensions and tolerances, material specification, surface finish requirements, intended quantity
  • DFM (Design for Manufacturing) review — supplier engineering reviews design for manufacturability; typically 5-10 day turnaround; recommendations may include draft angles, parting line placement, gate location, undercut handling, wall thickness optimization
  • Quotation and timeline — supplier quotes mold cost, per-part production cost, lead time for mold + first article approval; typical mold timeline 4-8 weeks for P20 production mold, 8-14 weeks for premium tooling
  • Mold deposit and design approval — typically 30-50% deposit to start mold work; supplier completes mold design with customer approval before manufacturing
  • Mold manufacture — typical 4-12 weeks depending on tier; complex tooling longer; supplier provides milestone updates
  • First article inspection — supplier produces 50-200 first-shot parts for customer evaluation; verify dimensional accuracy (CMM measurement), material spec, surface finish, function fit; first article approval (FAA) sign-off before main production
  • Production order — first batch typical 5,000-100,000 parts; balance payment for mold + production payment
  • Quality acceptance — incoming inspection per AQL plan (typical 1.0-2.5% AQL); CPK measurement on critical dimensions; supplier provides PPAP documentation for automotive applications
  • Series production — ongoing per-part orders against forecast; quarterly business review for performance management; mold stored at supplier facility for ongoing production

Frequently asked questions

Companion capital-equipment procurement framework — applicable to mold/equipment supplier qualification.

Companion industrial machinery sourcing guide.

Companion materials guide — additives often used in plastic injection molding processes.

Source: Product images on this page are hosted on the manufacturer's official website (kemalmfg.com) and link directly back to that website. All product information was summarised from the supplier's public catalogue.

Brand mentions and trademark compliance: References to Tier-1 contract manufacturer brands (Foxconn, Flex, Jabil, Sanmina, Celestica, Husky Injection Molding, Engel, Sodick, Mazak, DMG Mori) are made for the sole purpose of describing functional benchmarks and equipment context. Kemal Manufacturing is not authorized by, affiliated with, or endorsed by any of these brand owners. Manufacturing services are provided under Kemal Manufacturing's own quality and process systems.

Customer IP responsibility: Customer is responsible for protecting intellectual property when engaging contract manufacturing services. Recommend executing NDA before sharing design files, maintaining ownership of tooling, distributing design across multiple suppliers if appropriate, and securing trademark/patent registration in China before commercialization.

Regulated product responsibility: Medical devices, automotive products, aerospace components, and other regulated products require specific certifications (ISO 13485, IATF 16949, AS9100D, FDA registration, etc.). Verify supplier maintains current relevant certifications BEFORE engaging for regulated product manufacturing.

Pricing & specifications: All price ranges, lead times, and tier definitions reflect general market observation. Real-world contract manufacturing pricing depends on part complexity, material selection, volume, certification requirements, and current capacity utilization. Confirm current pricing, MOQ, lead time, and capability fit directly with the supplier.

No middleman role: CifyChina provides supplier discovery and editorial content. All transactions occur directly between buyer and supplier through the contact channels published on the supplier's official website.

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