Machined parts ship in 3 days, order your metal & plastic parts today. Contact us now

Machined parts ship in 3 days, order your metal & plastic parts today. Contact us now

Injection Molding Services

Our injection molding services help you save time and money on product development. The turnaround time for design feedback is only a few hours, and we offer free injection molding quotes.

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Lead time
Surface Finishes

Your Reliable Plastic Injection Molding Services

Want to turn creativity into tangible products? We are your reliable supplier of plastic injection molding services. Through our professional technology and high-quality service, we will help you achieve unique plastic products. Whether you need personal customization or mass production, we can meet your needs.

plastic injection molding

Plastic Injection Molding

Plastic injection molding is the injection of molten resin into a mold, a process that can efficiently produce large quantities of plastic parts and can manufacture complex geometric shapes.

plastic injection molds

Plastic Injection Molds

Our professional mold design and manufacturing team has strong design and engineering capabilities, and can design and manufacture various injection molds according to customer requirements.

insert molding

Insert Molding

Insert molding is the use of thermoplastic materials to mold materials around preformed parts into finished parts. This process is often used to create composite parts that contain multiple materials


Overmolding is an advanced manufacturing process that involves covering one material, such as plastic, with another material, such as metal or rubber, through a chemical bonding process.

Start Your Project With A Free Quote

Our plastic injection molding process produces custom prototypes and end-use production plastic parts with delivery times of up to 3 days. And stock about 100 different thermoplastic resins. Our goal is to help you finish quickly and provide quality plastic parts.

Gallery of Injection Molding Parts

Check out our extensive gallery, which showcases some of our finished injection molding parts, and trust us to create your plastic injection molding project according to your strict specifications.

Our Injection Molding Processes

Check out our efficient injection molding process and learn how we deliver your high-quality plastic parts on time within 3 days.

Request parts quotation

By uploading your design file to request a quote, our engineers will provide a response within 2 hours and start your project.

DFM Feedback

Conduct a feasibility review of your design to ensure that I, Moen, can produce functional molds that meet your requirements.

Mold Flow Analysis

Using mold flow analysis software to predict the flow and mode of action of molten materials within the mold can help improve and ensure the quality of the parts.

Part Mold Production

Start producing mold tools according to your requirements.

T1 Sample Verification

Before starting the production of plastic parts, we provide T1 samples for customer inspection to ensure the accuracy and quality of the parts.

Low Volume Production

After the sample trial production is completed, small batch production will begin. We utilize advanced processing technology to efficiently produce plastic parts.

Quality Control

We conduct strict inspections on the functionality, size, and appearance of plastic parts to ensure that they meet your specifications and requirements.


After strict inspection, we will deliver your injection molded parts to you as soon as possible.

From Tooling to Prototyping Production

Rapid Tooling

Create prototype molds within 3 days to ensure that your injection molded plastic parts can quickly undergo functional testing and be launched into the market.

Prototyping Production

Creating injection molds for manufacturing prototypes can help you validate design and material selection before formal production, reducing potential design errors and production issues.

Injection Molding Capabilities

Please check our injection molding parts manufacturing capabilities, For custom tolerances, mark them clearly on your drawing.

Types Size Tolerance
Maximum Part Size 1000 × 800 × 300 mm
39.37 × 31.49 × 11.81 inch
Minimum Part Size 1 × 1 × 1 mm
0.039 × 0.039 × 0.039 inch
Mold Cavity Tolerances +/- 0.1 mm
+/- 0.0039 inch
Part to Part Repeatability +/- 0.15 mm or less
+/- 0.0059 inch or less
Surface Finishing Options Mirror polishing, electroplating, spraying, screen printing, etc
Available Mold Types Steel and aluminum tooling
Production Grades Available From 105 grade (prototype tools) to 101 grade (high production tools)
Tool Ownership Customer-owned with mold maintenance
Lead Time Starts at 3 business days, including fast quote responses with design-for-manufacturing (DFM) feedback

* Tolerance: Typically, Longsheng can maintain a machining tolerance of+/-0.01 millimeters (+/-0.0039 inches).

Class of Injection Molding Mold

Please check our injection molding parts manufacturing capabilities, For custom tolerances, mark them clearly on your drawing.

Mold Class Purpose Shot Life Tolerance Lead Time
Class 101 Large-Scale Production Over 1,000,000 cycles +/- 0.01mm 13 days
Class 102 Medium-Batch Production High Volume +/- 0.01mm 10 days
Class 103 Medium to Small-Batch Production Less than 500,000 cycles +/- 0.01mm 10 days
Class 104 Medium to Small-Batch Production Less than 100,000 cycles +/- 0.01mm 9 days
Class 105 Advanced Prototype Testing Up to 500 cycles +/- 0.01mm 5 days

Materials for Injection Molding Parts

The following are common molded plastic materials provided by our injection molding services. You can wisely choose the injection molding materials that are suitable for your specific application needs.

Injection molding mold

Tooling Materials

Before starting the production of plastic parts, it is necessary to manufacture high tolerance CNC machining molds. 

Injection molded plastic parts

Plastic Materials

Our plastic injection molding services provide a variety of materials with their own characteristics and performance to meet different application needs. These materials include but are not limited to:

Why Choose LongSheng for Custom Injection Molding Services

Multi material machining

We have the ability to handle multiple materials, and we can provide professional solutions no matter what material of parts you need to process.


This unrestricted ordering method for plastic molded parts will help improve efficiency and reduce production costs, making your production process more competitive.

Customized services

Provide customized solutions based on customer design requirements and specifications to ensure that parts meet their unique needs.

Rapid delivery

We have efficient production processes and flexible production plans, which enable us to timely deliver customer orders and meet urgent project needs.

Our CNC Machining for Various Industrial Applications

Crossing numerous industries, Longsheng uses highly advanced technology, from prototype production to on-demand manufacturing, and then to large-scale production, to ensure the excellent quality and reliable performance of parts, ensuring the success of your project.

Advantages of Injection Molding

Injection molding is an efficient, precise and flexible manufacturing technology that produces plastic parts with great precision, speed and repeatability.

Applications of Injection Molding

Injection molding finds applications in a wide range of industries and products due to its versatility and efficiency in producing intricate parts.

Injection Molding Overview

What is injection molding?

Injection molding is used to manufacture plastic parts and products. During the injection molding process, melted plastic is injected into the mold, then cooled and hardened to form the required parts or products.

What is injection molding process steps?

Injection: Heat the plastic into a molten state and inject it into the mold.
Plastic filling: Ensure that the plastic fills the cavity of the mold to form the required parts.
Cooling: Allow plastic to cool and harden, usually using a cooling system to accelerate.
Mold opening and discharge: Open the mold and remove the formed parts, and then proceed with subsequent processing.

Why is injection molding used for plastic?

Efficient production: suitable for large-scale production and reducing costs.
High precision: Manufacturing precision parts to ensure consistency.
Strength and durability: Manufacturing parts with high strength and wear resistance.
Complex structure: Parts that can manufacture complex internal structures.

How does injection molding work?

Injection molding involves heating plastic materials to a molten state, then injecting them into a mold, allowing them to cool and solidify within the mold, ultimately forming the required parts or products. This process combines the plasticity of plastics with the precise shape of molds, allowing the manufacturing of various shapes and sizes of parts, from small parts to large components, to meet the needs of different industries and applications.

Frequently Asked Questions about Plastic Injection Molding

We provide new product developers with engine processing parts suitable for functional testing or final use of engineering -level materials. Get your required plastic injection molding service support by reading FAQ.

We can handle various types of plastic materials, including common ABS, PP, PE, PC, etc. Based on your needs and application scenarios, we will choose the most suitable material for you.

Yes, we can provide product design services. We have an experienced design team that can help you design and develop products from concept to reality.

Yes, we accept small batch orders. We understand that different customers have different needs, whether it's mass production or small batch customization, we can meet your requirements.

The production cycle varies based on project complexity and order volume. We will do our best to complete your order in the shortest possible time. After confirming the design and requirements, we will provide you with the estimated production cycle.

Yes, we can handle various design file formats, such as CAD, SolidWorks, etc. Please provide us with your design documents in an acceptable format.

In order to obtain an accurate quotation, we need you to provide the product's design drawings, size requirements, material selection, and estimated order quantity.

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