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Injection Molding Service

Custom Molded Prototypes and Production Parts with Fast Lead Times

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Our Molding Services
Materials
Applications and Benefits
Tolerances and Mold Classes
About Injection Molding
Why Xometry?
Download Guide

High Quality Plastic Injection Molding

Need molded parts that are truly custom? You have come to the right place. Xometry delivers high-quality, on-demand injection molding for prototypes and production parts.


Xometry takes a “have it your way” approach to molding, no matter your level of experience. We specialize in complex projects, including those requiring side action or hand loaded inserts. Our goal is to provide a long-term solution, moving beyond rapid prototyping, with dedicated project managers and engineering experts to communicate through all project stages from design to production. We offer molding solutions for every industry, including medical injection molding.


Injection molding, aka injection moulding, is the most cost-effective way to make a plastic part at scale and offers consistent quality for low-to-high volume manufacturing. Molding also has the highest variety of materials, colors, and configurations when compared to CNC machining or even 3D printing. Beyond materials, injection molded parts can have custom cosmetics, polishes, or surface textures.

injection molding parts

Xometry's Injection Molding Services

Our services are custom tailored for your needs:

  • Free online file upload and quote submssion
  • 24-hour quote responses with design for manufacturing (DFM) feedback
  • Large domestic partner network and international production options
  • Single point of contact per customer
  • Single-, multi-cavity, and family mold options
  • Most plastic materials, including custom sourcing and matching
  • Press availability from 50 to 1,100+ tons
  • Part inspection, including FAI and PPAP options
  • Customer-owned tooling
  • Injection molding capabilities for the medical device Industry
An injection molding machine at work

Insert Molding and Overmolding

Insert Molding

Insert Molding Service

Make Strong, Functional Prototypes and Production Parts With Insert Molding

Insert Molding Service
Overmolding part

Overmolding Service

High Quality Process for Pilot Runs, Low-Volume Production, and Bridge Tooling

Overmolding Service

Plastic Injection Molding Materials

Rigid And Flexible Plastic Varieties
Plastic Molding Resins
ABS | Acrylonitrile Butadiene StyrenePC-ABS | Polycarbonate-Acrylonitrile Butadiene StyrenePMMA | Polymethyl Methacrylate, Acrylic
ASA | Acrylonitrile Styrene AcrylatePC-PBT | Polycarbonate-Polybutylene Terephthalate, XenoyPOM | Acetal Polyoxymethylene, Delrin
CA | Cellulose AcetatePC-PET | Polycarbonate-Polyethylene TerephthalatePP | Polypropylene
COPO | CopolyesterPCT | Polycyclohexylenedimethylene TerephthalatePPA | Polyphthalamide
HDPE | High-Density PolyethylenePE | PolyethylenePPS | Polyphenylene Sulfide, Ryton
LCP | Liquid Crystal PolymerPE-PP | Polyethylene-PolypropylenePS | Polystyrene
LDPE | Low-Density PolyethylenePE-PS | Polyethylene-PolystyrenePS-PPE | Polystyrene-Polyphenyl Ethers, Noryl
PA 6 | Polyamide 6, Nylon 6PEBA | Polyether Block AmidePSU | Polysulfone, Udel
PA 6/6 | Polyamide 6/6, Nylon 6/6PEEK | Polyether Ether KetonePVC | Polyvinyl Chloride (Shore D)
PARA | Polyaryl AmidePEI | Polyetherimide, UltemPVDF | Polyvinylidene Fluoride
PBT | Polybutylene Terephthalate, ValoxPES | Polyether SulfoneSAN | Styrene Acrylonitrile
PBT-PET | Polybutylene Terephthalate-Polyethylene TerephthalatePET | Polyethylene Terephthalate, RyniteTPO | Thermoplastic Polyolefin
PC | PolycarbonatePLA | Polylactic AcidTPU | Thermoplastic Polyurethane (Shore D)

Check out more information our materials here.

Elastomers and Synthetic Rubbers for Molding

Rubber-Like Varieties
Elastomers and Rubber-Like Materials
EPDM | Ethylene Propylene Diene Monomer Rubber, VitonTPE | Thermoplastic Elastomer, Santoprene
MPR | Melt Processable RubberTPU | Thermoplastic Polyurethane (Shore A)
POE | Polyolefin ElastomerTPV | Thermoplastics Elastomer, Vulcanized Rubber
PVC | Polyvinyl Chloride (Shore A)LSR | Liquid Silicone Rubber

Check out more information our materials here.

Custom Sourced Materials

A variety of injection-molded plastic part options are available for an online quote. If you do not see the material stock you are looking for, please choose "Custom" under the material drop-down on your quote page and submit for an expert engineering review once you have specified features, tolerances, inspection needs, and quantities required. Xometry can also use customer-source or customer-supplied resin for production projects!

Injection Molding Finishes
Standard Finish

Moldmaker's choice of finish. Typically SPI B-3 to D-3 depending on geometry and drafts. Interior, non-cosmetic faces, are typically as-machined.

SPI Finishes

Range of finishes from Grade 3 diamond / high polish to 320 stone low polish. Finishes include: SPI A-1 , SPI A-2, SPI A-3, SPI B-1, SPI B-2, SPI B-3, SPI C-1, SPI C-2, SPI C-3, SPI D-1, SPI D-2, and SPI D-3

MoldTech Finishes (Mold Texturing)

Range of finishes including matte, swirls, lines, and patterns. Our most common texture finishes include: MoldTech MT11010, MoldTech MT11020, and MoldTech MT11030. Other textured finishes can be added by request.

As Molded

No secondary polishing or grinding. Part will show tooling marks.

Threaded Inserts

We can install most commonly used standard inserts in UNF and metric sizes.

Pad Printing

Transfer a 2D image onto a 3D part. All images are subject to review.

Laser Engraving

Engrave part numbers, logos, and more onto your parts.

Assembly

Xometry has the ability to assemble & label molded parts. Discuss your needs with your salesperson.

Injection molding services

Ready to get started on your custom injection molding quote?

Injection Molding Applications

Injection Molded Part
Rapid Prototyping
Injection Molded Part

Low-cost tooling allows molded parts to be produced very rapidly and cost-effectively.

Production Parts
Injection molding parts with pass thru coring

Molding is best known for its unmatched production capabilities from thousands to millions of identical parts.

Range of Industries and Certifications
plastic pellets used for molding

We offer ISO 9001, AS9100, ISO 13485, UL, ITAR, and ISO 7 & 8 Medical Clean Room molding.

Advantages of Injection Molding

Scalability

Scalability

Molding can be the ideal process for custom production runs of 250 to 250,000+ parts.

Efficiency

Efficiency

In higher volumes, custom molding with Xometry produces significantly less waste than other manufacturing processes.

Rapid Turnaround

Rapid Turnaround

High quality molded parts in as little as 10 business days.

Part Production

Part Production

Piece price is significantly lower with injection molding vs other processes, particularly as production quantities increase into the thousands.

Strength

Strength

Molded parts will generally perform better than the same part CNC Machined or 3D printed using the same material. Careful selection of the resins allow for a wide range of properties and solvent compatibility.

Precision

Precision

Molds are CNC machined to high precision, high tolerances and are able to produce thousands of identical parts with very small and intricate details.

Injection Molding Tolerances

DescriptionTolerance Notes
Mold Cavity TolerancesTypical tolerances are +/- 0.005" when machining the mold and an additional +/- 0.002"/in when calculating for shrink rate.
Part to Part Repeatability+/- 0.004" or less.
Critical Feature TolerancesTighter tolerances can be requested and may increase the cost of tooling. Additionally, many tight tolerances require the mold to be manufactured, sampled, and then groomed. Xometry will mill to a steel-safe condition on critical features.

This table is based on the assumption that designs have an adequate draft, radii, and coring for manufacturability. Please check out Xometry's Manufacturing Standards for more information on tolerances per process.

Mold Class Glossary

Mold Class Glossary
NameCyclesDescription
Class 105Under 500Prototype only. This mold will be constructed in the least expensive manner possible to produce a very limited quantity of prototype parts. Also known as a Class V tool. Example: a one-and-done market test of 100 molded units.
Class 104Under 100,000Low production mold. Use only for limited production preferably with non-abrasive materials. Low to moderate price range. Also known as a Class IV tool. Example: Aluminum or MUD tooling, SPI B-3 finish, hand-loaded cores and limited re-runs.
Class 103Under 500,000Medium production mold. This is a very popular mold for low to medium production needs. Most common price range. Also known as a Class III tool. Example: Aluminum or steel tooling, automated lifts or slides, multiple re-runs with batches between 1,000-5,000 units.
Class 102Under 1,000,000Medium to high production, good for abrasive materials and/or parts requiring close tolerance. This is a high quality, fairly high priced mold. Also known as a Class II tool. Example: Steel tooling with an SPI A-2 finish, automated slides, scheduled production cycles.
Class 101Over 1,000,000Built for extremely high production. This is the highest-priced mold and is made with only the highest quality materials. Also known as a Class I tool. Example: Multiple-cavity steel tooling with full automation and overnight production workcenters for dedicated part manufacturing.

The injection molding industry often defines molds by their class. This goes from Class 105, a prototype mold (e.g., a 100 piece one-and-done market test), to Class 101, which is built for extremely high production (e.g., making tens-of-millions contact lens cases). Xometry typically produces Class 104, 103, and 102 tools.

What is Injection Molding?

The Basics Of Injection Molding

Injection molding is one of the most often-used manufacturing processes for creating plastic parts. Thanks to its high-precision, repeatability, and cost efficiency at scale, injection molding is used to make a variety of products and parts from the smallest medical insert up to large automotive & aerospace and defense parts. The injection molding process requires an injection molding machine, raw plastic material, and a machined mold. The raw plastic material is first melted in the injection unit and is then injected into the mold — most often machined from steel or aluminum — where it cools and solidifies into the final plastic part. The key steps in the injection molding process are clamping, injection, cooling, and ejection.


Benefits Of Injection Molding

Custom injection molding offers a number of benefits not found in other manufacturing processes. Due to the high-pressure nature of the injection molding process, it is much easier to manufacture parts with detailed features or complex geometries that would be too costly for typical CNC machining processes. The ability to use your mold over and over again for a long period of time leads to an extremely high production output rate which is more cost effective and efficient than other manufacturing processes. Lastly, different injection molding processes, such as overmolding and insert molding, allow you to create plastic parts with unique characteristics such as enhanced strength, soft-grip surfaces, or added flexibility. Also beneficial is the ability to combine multiple assembly processes into one injection molding process.

Injection molding services graphic
Types of Injection Molding at Xometry
Thermoplastic Injection Molding

Xometry delivers top quality plastic injection molded parts in as little as 10 business days. Our Manufacturing Partner Network can help you design and manufacture tools, dies, and molds for rapid tooling for prototyping to advanced mold making for production runs. Full injection molding capabilities including insert molding, overmolding, unlimited undercuts, and internal/external threads are available.

Range of Mold Making Options

Our vetted network of partners allow us to quickly convert your 3D part data into a high-quality injection mold at top speed. We offer services from design and manufacturing for tools, dies, and molds for prototyping and production runs. Plastic blow molds, aluminum and steel tooling, 2-shot and 3-shot molding are also available. And with Xometry, you own your own tools, so our partner network also offers mold maintenance services.

Why Choose Xometry for Injection Molding?

Massive Network Capacity

Endless Options

Choose from millions of possible combinations of materials, finishes, tolerances, markings, and certifications for your order.

Instant Quoting Engine

Easy to Use

Get your parts delivered right to your door without the hassle of sourcing, project management, logistics, or shipping.

Guaranteed Quality

Vetted Network

Only the top 6% of shops that apply to become Partners make it through our multi-tiered qualification process, so you can be confident your parts will be made right.

Download our injection molding design guide today!

Download the injection molding design guide

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