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Overmolding Services

Our Overmolding Services

Our over-molding services help custom quality parts from prototypes to on-demand production with competitive prices and fast turnaround.

Advanced Equipment & Cost-Effective Price

ISO 9001 & ISO13485 Certified Factory

10+ years experience in Overmolding

Delivery time As Fast As 3 Days

24/7 Engineering Support


Our Robust Overmolding Capabilities

  • 30t-1800t

    Molding Machine

  • 12

    Surface Finishes

  • 0Pcs


  • 0.005mm


With professional project managers and engineers in overmolding, we help to make your project come true from design to production. NOBLE’s overmolding service is dedicated to ensuring your product's better performance.


Metric Units

Imperial Units

Maximum Part Size


7. 87×15. 75×3. 94in.

Minimum Part Size


0. 08×0. 08×0. 08in.

Substrate Wall Thickness

From 0. 5 to 3mm

From 0. 20 to 0. 12 in.


+/- 0. 025 mm

+/- 0. 00098 in.


0. 1mm

0. 0039in.


100mm from the parting line

3. 94in. from the parting line

Mold Validation

Provide T0, T1, T2 samples before mass production

Inspection and Certification Options

First Article Inspection, ISO 9001, ISO13485

Lead Time

From mold making to sample delivery: 15-45 business days

Advantages of Overmolding Process

Reliable Product Performance: Overmolded components are tightly connected, protecting themselves from moisture, and dust. Combining the excellent properties of multiple materials into one, overmolded components ensure better performance.

Slash Production Cost: By overmolding, multiple parts are combined into one. No need to do the assembly. Save time and labor costs, making production more efficient. Therefore, it helps to reduce overall manufacturing costs.

Enhanced design and aesthetics: Overmolding adds one material to another. Some designs and optimations can be made in materials and surface machining.

Materials for Overmolding

These are common molded plastics offered by our injection molding services. After knowing the basics of materials such as common grades, brands, advantages, and disadvantages, choose the appropriate injection molding material according to your application requirements.

Tooling Materal:

Before injection molding process starts low or high-volume production, a high tolerance CNC machined tooling is needed. Most commonly used materials include:

Tool Steel:P20, H13, S7, NAK80, S136, S136H, 718, 718H, 738
Stainless Steel:420, NAK80, S136, 316L, 316, 301, 303, 304
Aluminum:6061, 5052, 7075
Plastic Materials:

Plastic injection molding service comes with a wide range of materials with different properties, including impact strength, rigidity, thermal resistance, chemical resistance, etc.

Additives and Fibers

Standard plastic materials may not meet custom injection molding parts requirement. In this case, additives and fibers can be added to improve aesthetic and functional properties, providing additional features for your injection molded parts.

FlameretardantsGlass fibers

Surface Finishes of Overmolding

Improve the quality of your overmolded parts with excellent surface finishes. NOBEL offers a long list of surface finishing options to improve the cosmetic quality of your products. We provide exceptional secondary operations to improve the overall quality of products.




A grade finishes are made using a diamond buffing process and yield shiny and glossy surfaces on injection molded parts.


B grade finishes use grit sandpaper to produce parts with a slightly rougher finish than grade A parts. Custom molded plastic parts that undergo B grade finishing have a matte surface texture.


C grade finishes use grit sanding stones to produce a rough, uneven surface. Injection plastic parts that undergo C grade finishing have a matte surface texture.


D grade finishes use grit and dry glass beads or oxide to produce a very rough textured finish. Depending on the type of material used, products can have a satin or dull finish.

Why Choose NOBLE for Custom Overmolding Services?

At Noble, we take an approach designed to meet your custom overmolding needs. Our aim is to provide engineering specialists and project managers with long-term prototype overmolding solutions from design to production. NOBLE combines cost-effective mold machining with technology-driven overmolding services, which will improve quality parts, reduce part costs, and escort your machining projects.

  • Optical MOQ

    No restrictive MOQ is needed, which is beneficial for you to make a flexible cash flow. And make sure molded parts are efficient from prototype to production.

  • service03
    Rapid Lead Times

    Abundant raw materials supply and adequate machines to speed up production.

  • 质量
    Reliable Quality

    Owing fully furnished certification and a complete quality inspection process, NOBLE guarantees every component is in good and high precision.

  • 专业队
    Professional Overmolding Team

    Equipped with 10+ Senior Engineers and a well-structured team, making an effective turnaround from prototype to production.

Work with Us in 4 Simple Steps Only

NOBLE has many years of manufacturing experience providing the best solution for all Overmolding and low-volume manufacturing needs. We've simplified the innovation cycle into four simple but effective steps.

  • Upload Your Design

    Just simply upload your CAD files and submit RFQs with clear information online.

  • Receive Design Analysis

    We'll send you design for manufacturability analysis and transparent pricing.

  • Start Manufacturing

    Our experts will produce your parts with the required technologies and materials.

  • Receive Your Parts

    Your parts will be delivered to your door directly with stringent deadlines.

Custom Overmolded Parts Display

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See What Our Customers Say About Us

Tooling Engineer --- Aaron Nave

We have cooperated with NOBLE for 3 years. NOBLE helped us with auto parts. Their professional service from design to the final product meets our quantity. We will build a long-term partnership with NOBLE.

Senior Engineer ---- Dave Stashko

Thanks to all of the staff in NOBLE. Their staff has professional knowledge and is responsible and patient so that we have a smooth process from ideas to manufacturing. This is also one reason we have business with NOBLE for many years.

29.Karen Tsang
Designer ---- Andy Mandarino

NO is our top supplier of injection molded parts. We have good communication about design. When we received the final product, they are so lovely and pretty. I recommend NOBLE to anyone who wants to custom parts.

Project Engineer ---- Greg Reginelli

We have been working with NOBLE for 4 years. They help us with many products. They will also provide suggestions for you in manufacturing. And we also are impressed with their skillful knowledge and swift response.

Applications of Overmolding

  • 医疗
    Medical Instrument

    Overmolding is critical to satisfying precision and safety,withstanding sophistication and storage in medical devices.Overmolding combines plastics and metal into one product.The common usage in surgical instruments, like syringes,dilators,soft-touch and more.

  • 五金
    Hardware tools

    Overmolding Improved the grip of hardware tools, making them safer and more ergonomic. Excellent examples are screwdrivers, pliers, wrenches, blades, and more.

  • 汽车
    Car Trims

    The overmolding’s aesthetic advantages are fully reflected in the application of car trims.Such as the door edge, side body, fender, bumper, wheel, and others. These not only reduce the weight of the car but also facilitates the customization of multiple colors in cars.

  • 家居
    Household items

    Overmolding could improve grip, cleanliness, chemical resistance, and more in products. Overmolded products also improve the consumers' quality of life. They are easy to use, clean, and prolong the shelf life. Like kitchen utensils, multi-port chargers, toothbrushes, and the like.

Overmolding FAQs

  • Q

    What is overmolding process?


    Overmolding is a manufacturing process in which a substrate or pre-existing part is encased in a second material to create a composite part with improved functionality, aesthetics, or durability. The process typically involves two or more stages of injection molding, in which the substrate or first material is molded first and then a second material is molded over it.

  • Q

    What is the difference between overmolding and 2K molding?


    Traditionally, overmolding involves placing a part formed in one tool/machine into a second tool to mold a second material over the original part. The result is a part with a strong bond between the two materials. Modern overmolding is now called 2K or overmolding.

  • Q

    What is the difference between overmolding and insert molding?


    Traditionally, overmolding involves two injections of material to form the substrate and overmolding. Insert molding involves only one injection of molten plastic, but metal inserts need to be purchased or fabricated separately.

  • Q

    What are the rules for overmolding?


    According to NOBLE's more than ten years of experience in injection molding, the thickness of the overmolding material should be less than or equal to the thickness of the substrate below it, and at the same time, the melting temperature of the overmolding material should be lower than that of the substrate. Of course, chemical bonding of overmolded materials is not feasible or successful.

  • Q

    What is the thickness of the overmolding?


    Based on the overmolding experience of NOBLE engineers, the overmolding design needs to pay attention to the following two major matters: 1. The wall thickness of the base material and secondary molding should be as uniform as possible to obtain cycle time. 2. Wall thickness should be controlled within the range of 0.711 to 3.81 mm to ensure good adhesion in most overmolding applications.

  • Q

    How does overmolding work?


    Overmolding is a manufacturing process that involves molding one material over another to create a composite part with improved functionality, aesthetics, or durability. The process typically involves two steps:

    1. First, a substrate material is molded into a specific shape using injection molding or another molding process. The substrate material can be made of metal, plastic, or any other material that can withstand the molding process.

    2. Next, a second material, called the overmold material, is molded over the substrate material to create a composite part. The overmold material is chosen for its compatibility with the substrate material, its mechanical properties, and its processing characteristics. The overmold material can be a thermoplastic or thermosetting material, depending on the specific requirements of the application.

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