Precision Manufacturing of Hot Runner System Components-FU

Precision Manufacturing of Hot Runner System Components

Hot runner systems are essential components of modern, high speed, efficient, injection molding. The  quality of your hot runner system components determines the improvement to productivity and quality of manufacturing. JC Machining manufactures high precision hot runner components to exacting quality standards that ensure the smooth operation and clean, efficient, throughput you want for your injection molding processes.

What is a hot runner system?

A hot runner system is made up of heated components that guide the molten plastic as it flows into the injection mold, and keep the plastic molten between injection molding cycles. This is different from traditional injection molding, which creates sprue and runners that cool and set with every production cycle and have to be removed in an additional production stage.

Hot runner system components are fed with molten plastic through a heated manifold. The molten plastic is directed into the cavities of the mold through channels. Hot runner channels have gates to control the flow, and shut off the flow when the cavity has been filled. The result is that the injection molded product is completed without remaining attached to a sprue.  

The injection molding machine is programmed to open and close the hot runner gates and adjust the temperature of the hot runner system to ensure the plastic remains molten between cycles and exactly the right volume of plastic is injected at the correct pressure before the gates are closed. High precision hot runner components enable injection molding of complex and intricate products without leaving visible marks that show where the plastic was injected into the mold.

What are three advantages of hot runner injection molding?

  1. Shorter cycle times increase productivity
  2. No waste from sprues and runners
  3. Clean products with minimal finishing

Hot runner systems enable faster throughput, reduce plastic waste and regrinding, and can produce a very clean result that does not require additional finishing work. This makes them ideal for high volume production, especially of complex parts, and for production of delicate and intricate designs that are difficult to detach from a cold sprue without damage or distortion.

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JC Machining Hot Runner System Component Manufacturing

We are experts in the manufacture of high quality hot runner system components, customized to meet any specific application. Our efficient CNC machining services are all in-house, ensuring rapid fulfillment of your order for hot runner system components, all backed by our zero defect guarantee.

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  • nozzle tips
  • nozzle tip insulators
  • valve pins
  • ejector pins
  • nozzle housings
  • valve bushings
  • heating elements
  • Thermocouples
  • Retainers 
  • seal nuts

The hot runner nozzle tip shown here was manufactured by us in SDK61 using CNC turning and cylindrical grinding to a +/- 0.02mm tolerance. This example is shown as machined with no additional finishing or surface treatments. 

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This copper heating element shows the excellent results possible in non-ferrous metals, with additional sandblasting after CNC turning, CNC grinding and surface grinding to achieve a +/- 0.01mm tolerance for our client.


There is no compromise in manufacturing hot runner system pistons, which must be machined to very exact tolerances and finishes. This example has been CNC turned from SUS40 stainless steel to a +/- 0.01mm tolerance, and finished using cylindrical and surface grinding to achieve ARa 0.5-0.8 to ensure long life and reliable operation.

Experienced & efficient hot runner system component manufacturing

We maintain a comprehensive, modern suite of advanced CNC machines, and carry out all CNC machining processes in-house with no outsourcing. When you work with JC Machining you can expect the increased efficiency and quality control that comes from a team of experienced technicians who are dedicated to all stages of your project.

Hot runner systems must be easy for mold makers to repair and maintain, with swift identification of necessary replacement parts. We manufacture all types of hot runner components as well as replacement spare parts for all hot runner systems to keep your production running smoothly.

Contact our expert technicians to discuss how we can satisfy your requirements. You can also upload a  2D or 3D design (CAD) file online, send us your drawings or samples to duplicate. We make it as easy as possible for you to get the results you want, and our zero defects guarantee ensures your complete satisfaction.

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Frequently Asked Questions
  • Parts machined will follow ISO 2768-m (medium) or ISO 2768-f (fine).
  • We guarantee on following ISO 2768 standards for all CNC machined parts and other components  that do not include specific tolerance requirements.
  • For even tighter tolerances on shafts, we offer custom quotes as a free service.

In our current facilities, we have:

  • 6 CNC milling machines
  • 12 CNC lathe machines
  • 15 High-variant grinding machines
  • 46 Grinding machines
  • 11 Types of Wire-EDM Sandblaster
  • Knurling Machine

Other advanced manufacturing equipment.

There is no MOQ. We offer solutions such as one-off rapid prototypes, custom low-volume CNC machining, and mass production with short lead times.

Even though our in-house machines can machine larger parts, we recommend these sizes:

  • Maximum Turning Diameter: 250 mm
  • Maximum Turning Length: 300 mm
  • Maximum Grinding Diameter: 250 mm
  • Maximum Grinding Length: 400 mm
  • Maximum EDM Length Hole: 50mm
  • Maximum EDM Length: 250mm
  • Maximum Wire-EDM Thru hole Height: 100mm
  • Maximum Wire-EDM Length & Width Capacity: 300*500mm

Lead times will vary depending on your project complexity and our capacity:

For larger projects, in general, you can expect shipment 2-3 weeks after sending in your confirmed order.

With rapid one-off CNC prototypes, global delivery can be within 10 days.

Our sales office operates from 8:00 am to 6:00 pm local time (GMT+8)

Our factory operates 24/7 Monday to Sunday.

As Machined, Polishing, Sand Blasted, Black Oxide, TiN, TiCN, TiALN, AlCrN, DLC and Chrome Plated.

We offer free ground shipping limited to customers in Taiwan and China. For other locations, our sales and fulfillment team will work with the carriers of your choice.

We understand that your 3D data and designs are invaluable to your business. Therefore, we take the protection of your intellectual property rights (IPR) very seriously. We encrypt all files that are transferred using SSL, ensuring that they can’t be intercepted while being uploaded to our servers.All the information and any files which you upload onto our platform are stored securely, and only ever shared within our organization with those employees who need access to it in order to manufacture your parts.

We ensure confidentiality across the entirety of your order; original drawings are not shared with 3rd party suppliers as all our production is done in-house.If you would like some additional reassurance, we can sign a Non-Disclosure Agreement.

JC Machining has a CNC manufacturing team of professional engineers and machinists to reduce manufacturing redundancy, optimize CNC programming, shorten machining time, improve surface finish, and deliver the best quality machined parts.We take each project personally and carefully examine each drawing, we can then enhance the 2D/3D designs by adding clarity and detailed information and further analyze your design to accommodate any special fixturing and machining strategies used to produce your parts at a very reasonable cost.

Our manufacturing team follows strict quality control standards, delivering 100% accuracy at strict tolerances. You can also call or email us at any time, and we’ll help with ordering parts, design feedback, material recommendations, and answer any questions.