Explore All Our Bushings
Overview
The Polyshot Heated Sprue Bushing product line was meticulously designed to meet the requirements of precision injection molders processing both engineered and commodity resins. Our integrally heated sprue bushing features a distinct construction with a single heater that ensures a more uniform heat profile, with a thermocouple sensing directly at the point of melt flow control within the bushing body.
The robust, hardened tool steel body of our hot sprue bushings guarantees longer heater life, even under demanding molding cycles. This design helps reduce heat loss, improve heat transfer, and contribute to a streamlined flow channel that enhances overall performance.
The performance and reliability of our Hot Sprue Bushings have set the standard in the industry for over 30 years. To date, our hot sprue bushings technology has facilitated the production of hundreds of millions of parts for the medical, consumer, automotive, and recreation industries. The integrally heated sprue bushing plays a crucial role in ensuring superior heat transfer and maintaining the efficiency of the molding process. The bushing is specifically designed to handle high temperatures and demanding environments.
The profile-wound single heater, encased in a removable, tapered stainless steel sleeve, forms an integral part of the hot sprue. This fits over the hot sprue nozzle body and is also tapered. Tightening the interface cap forces the assembly together, creating a very tight fit between the hot sprue heater and nozzle body. This precise fit contributes to longer heater life and rapid nozzle response time. The design also minimizes heat loss during the process, which is critical in maintaining efficiency.
Polyshot’s Hot Sprue Bushings excel in processing Liquid Crystal Polymers (LCPs), such as Vectra, in addition to other high-temperature materials like PEEK and Ultem. Their melt flow control is paramount for these demanding molding cycles where superior heat transfer is necessary. This technology is considered the standard for those requiring streamlined flow channels and optimal performance in restricted areas. Our sprue bushings are also compatible with various molds, ensuring versatility in application.
Find our Hot Sprue Bushings Data Sheet here.
Description
The Polyshot bushing length will be shorter at room temperature than when at operating temperature due to thermal expansion. The heated sprue bushing length will be +.000 to -.010 from the stated dimensions. More exact length requirements can easily be achieved by machining material off the contact surface of the collar face.
For a non-standard “A” length to be finished by Polyshot, specify the special “A” length. For a non-standard “A” length to be modified in the field by the customer, order the Polyshot Heated Sprue Bushing with the “blank collar #109” in place of the standard collar.
The heaters in the Polyshot bushing will operate at 208–240 single-phase volts AC only. The heated sprue bushing controls temperature by sensing directly at the point of melt flow control, ensuring a more uniform heat profile. This allows the settings on the controller (Firebox) to be approximately 120 °F cooler than the nozzle on the molding machine.
The thermocouple plays a critical role in this setup, ensuring precise control over the temperature to improve heat transfer and maintain a consistent streamlined flow channel.
Additionally, the thermocouple ensures accurate temperature readings, which are essential for maintaining the integrity and performance of the sprue bushing. These features are integral in ensuring that our sprue bushings meet industry standard specifications.
All dimensions are in inches. Metric Polyshot heated sprue bushings are available upon request. You can also obtain Polyshot Heated Sprue Bushing drawings at no charge. These drawings include every part number and specification required for assembly. Our sprue bushings are built to match the exact part number specifications, ensuring compatibility with your existing molds. Each part number is meticulously cataloged, allowing for easy reference and reordering. When placing an order, please reference the specific part number to ensure accuracy and prompt service.
The thermocouple design in these integrally heated sprue bushings allows for highly efficient heat transfer, making them ideal for use in restricted areas where space is limited but precision is required.
Get in touch for further information about any part number or technical specification.
Conan Microbushing
Description
The Conan Version of the Polyshot Microbushing will allow the molding of very small electrical connectors and the like, with materials including glass filled LCPs and nylons. It is most often used to gate into a cold runner system, which feeds parts through a sub-gate system.
It can be installed directly into the mold with the mold maker machining the gate well detail into the cavity. It can also be furnished with a Conan R gate interface cap to allow installation into a .625″ diameter hole machined into the “A” half of the mold. The Conan R configuration will leave a slight “ring” witness line if gated directly into a molded part surface.
Bushing Body Section
Click on the part number below to download the files.
| Part Number | Heated "A" Length |
|---|---|
| Conan-Micro-875 | 0.875" |
| Conan-Micro-1.375 | 1.375" |
| Conan-Micro-1.875 | 1.875" |
To order a Conan Microbushing Heated Sprue Bushing, please submit a request for the quote below.
Gate Well Detail
Conan 075SC Bushing
Description
The Polyshot Conan 075SC Bushing is installed into a gate well detail machined into the “A” half of the mold by the mold maker. This bushing can also be fitted with a gate interface cap, to allow installation into a .7500″ diameter hole machined into the “A” half of the mold. This configuration will leave a slight “ring” witness line if gated directly into the part surface.
Bushing Body Section
Click on the part number below to download the files.
| Part Number | Heated "A" Length |
|---|---|
| Conan-075-875 | 0.875" |
| Conan-075-1.375 | 1.375" |
| Conan-075-1.875 | 1.875" |
| Conan-075-2.375 | 2.375" |
| Conan-075-2.875 | 2.875" |
| Conan-075-3.375 | 3.375" |
To order a Conan 075SC Series Heated Sprue Bushing, please submit a request for the quote below.
Gate Well Detail
Conan 100C Bushing
Description
Polyshot Conan-100C Bushings are installed into a gate well detail machined into the “A” half of the mold by the mold maker. This bushing can also be fitted with a gate interface cap, to allow installation into a 1.0000″ diameter hole machined into the “A” half of the mold. This configuration will leave a slight “ring” witness line if gated directly into the part surface.
Bushing Body Section
Click on the part number below to download the files.
| Part Number | Heated "A" Length |
|---|---|
| Conan-100C-875 | 0.875" |
| Conan-100C-1.375 | 1.375" |
| Conan-100C-1.875 | 1.875" |
| Conan-100C-2.375 | 2.375 |
| Conan-100C-2.875 | 2.875" |
| Conan-100C-3.375 | 3.375" |
| Conan-100C-3.875 | 3.875" |
| Conan-100C-4.375 | 4.375" |
To order a Conan 100C Series Heated Sprue Bushing, please submit a request for the quote below.
Gate Well Detail
P Microbushing
Description
The Polyshot P Microbushing was designed to be installed in small molds such as those used in the Nissei HM7 injection molding machine and others. Its small size and flow path makes it very well suited to the very small shot sizes used in these applications.
Polyshot P-Microbushing is installed into a gate well detail machined in the “A” half of the mold by the mold maker. This bushing can also be fitted with a PR Gate Interface Cap, to allow installation into a .625″ diameter hole machined in the “A” half of the mold. The PR configuration will leave a slight “ring” witness mark if gated directly into the part surface.
Bushing Body Section
Click on the part number below to download the files.
| Part Number | Heated "A" Length |
|---|---|
| P-Micro-875 | 0.875" |
| P-Micro-1.375 | 1.375" |
| P-Micro-1.875 | 1.875" |
To order a P Microbushing Heated Sprue Bushing, please submit a request for the quote below.
Gate Well Detail
| Gate Ø | Gage Dimension |
|---|---|
| 0.0270 | 0.2178 |
| 0.0280 | 0.2173 |
| 0.0290 | 0.2168 |
| 0.0300 | 0.2163 |
| 0.0310 | 0.2158 |
| 0.0320 | 0.2153 |
| 0.0330 | 0.2148 |
| 0.0340 | 0.2143 |
| 0.0350 | 0.2138 |
| 0.0360 | 0.2133 |
| 0.0370 | 0.2128 |
| 0.0380 | 0.2123 |
| 0.0390 | 0.2118 |
| 0.0400 | 0.2113 |
| 0.0410 | 0.2108 |
| 0.0420 | 0.2103 |
PR Microbushing
Description
The Polyshot PR Microbushing was designed to be installed in small molds such as those used in the Nissei HM7 injection molding machine and others. Its small size and flow path makes it very well suited to the very small shot sizes used in these applications.
Polyshot PR-Microbushing is installed into a gate well detail machined in the “A” half of the mold by the mold maker. This bushing can also be fitted with a PR Gate Interface Cap, to allow installation into a .625″ diameter hole machined in the “A” half of the mold. The PR configuration will leave a slight “ring” witness mark if gated directly into the part surface.
Bushing Body Section
Click on the part number below to download the files.
| Part Number | Heated "A" Length |
|---|---|
| PR-Micro-875 | 0.875" |
| PR-Micro-1.375 | 1.375" |
| PR-Micro-1.875 | 1.875" |
To order a PR Microbushing Heated Sprue Bushing, please submit a request for the quote below.
Gate Well Detail
| Gate Ø | Gage Dimension |
|---|---|
| 0.0270 | 0.2178 |
| 0.0280 | 0.2173 |
| 0.0290 | 0.2168 |
| 0.0300 | 0.2163 |
| 0.0310 | 0.2158 |
| 0.0320 | 0.2153 |
| 0.0330 | 0.2148 |
| 0.0340 | 0.2143 |
| 0.0350 | 0.2138 |
| 0.0360 | 0.2133 |
| 0.0370 | 0.2128 |
| 0.0380 | 0.2123 |
| 0.0390 | 0.2118 |
| 0.0400 | 0.2113 |
| 0.0410 | 0.2108 |
| 0.0420 | 0.2103 |
P-075SC Bushing
Description
The Polyshot P-075SC Bushing is installed into a gate well detail machined in the “A” half of the mold by the mold maker. This bushing can also be fitted with a PR Gate Interface Cap, to allow installation into a .7500″ diameter hole machined in the “A” half of the mold. The PR configuration will leave a slight “ring” witness mark if gated directly into the part surface.
Bushing Body Section
Click on the part number below to download the files.
| Part Number | Heated "A" Length |
|---|---|
| P-075SC-875 | 0.875" |
| P-075SC-1.375 | 1.375" |
| P-075SC-1.875 | 1.875" |
| P-075SC-2.375 | 2.375" |
| P-075SC-2.875 | 2.875" |
| P-075SC-3.375 | 3.375" |
To order a P-075SC Series Heated Sprue Bushing, please submit a request for the quote below.
Gate Well Detail
| Gate Ø | Gage Dimension |
|---|---|
| .0270 | .2178 |
| .0280 | .2173 |
| .0290 | .2168 |
| .0300 | .2163 |
| .0310 | .2158 |
| .0320 | .2153 |
| .0330 | .2148 |
| .0340 | .2143 |
| .0350 | .2138 |
| .0360 | .2133 |
| .0370 | .2128 |
| .0380 | .2123 |
| .0390 | .2118 |
| .0400 | .2113 |
| .0410 | .2108 |
| .0420 | .2103 |
PR-075SC Bushing
Description
The Polyshot PR-075SC Bushing is installed into a gate well detail machined in the “A” half of the mold by the mold maker. This bushing can also be fitted with a PR Gate Interface Cap, to allow installation into a .7500″ diameter hole machined in the “A” half of the mold. The PR configuration will leave a slight “ring” witness mark if gated directly into the part surface.
Bushing Body Section
Click on the part number below to download the files.
| Part Number | Heated "A" Length |
|---|---|
| PR-075SC-875 | 0.875" |
| PR-075SC-1.375 | 1.375" |
| PR-075SC-1.875 | 1.875" |
| PR-075SC-2.375 | 2.375" |
| PR-075SC-2.875 | 2.875" |
| PR-075SC-3.375 | 3.375" |
To order a PR-075SC Series Heated Sprue Bushing, please submit a request for the quote below.
Gate Well Detail
| Gate Ø | Gage Dimension |
|---|---|
| .0270 | .2178 |
| .0280 | .2173 |
| .0290 | .2168 |
| .0300 | .2163 |
| .0310 | .2158 |
| .0320 | .2153 |
| .0330 | .2148 |
| .0340 | .2143 |
| .0350 | .2138 |
| .0360 | .2133 |
| .0370 | .2128 |
| .0380 | .2123 |
| .0390 | .2118 |
| .0400 | .2113 |
| .0410 | .2108 |
| .0420 | .2103 |
P-100C Bushing
Description
Polyshot P-100C Bushings are installed into a gate well detail machined into the “A” half of the mold by the mold maker. This bushing can also be fitted with a PR gate interface cap, to allow installation into a 1.0000″ diameter hole machined into the “A” half of the mold. The PR configuration will leave a slight “ring” witness line if gated directly into the part surface.
Bushing Body Section
Click on the part number below to download the files.
| Part Number | Heated "A" Length |
|---|---|
| P-100C-875 | 0.875" |
| P-100C-1.375 | 1.375" |
| P-100C-1.875 | 1.875" |
| P-100C-2.375 | 2.375" |
| P-100C-2.875 | 2.875" |
| P-100C-3.375 | 3.375" |
| P-100C-3.875 | 3.875" |
| P-100C-4.375 | 4.375" |
To order a P-100C Series Heated Sprue Bushing, please submit a request for the quote below.
Gate Well Detail
| Gate Ø | Gage Dimension |
|---|---|
| 0.0270 | 0.2178 |
| 0.0280 | 0.2173 |
| 0.0290 | 0.2168 |
| 0.0300 | 0.2163 |
| 0.0310 | 0.2158 |
| 0.0320 | 0.2153 |
| 0.0330 | 0.2148 |
| 0.0340 | 0.2143 |
| 0.0350 | 0.2138 |
| 0.0360 | 0.2133 |
| 0.0370 | 0.2128 |
| 0.0380 | 0.2123 |
| 0.0390 | 0.2118 |
| 0.0400 | 0.2113 |
| 0.0410 | 0.2108 |
| 0.0420 | 0.2103 |
| 0.0430 | 0.2098 |
| 0.0440 | 0.2093 |
| 0.0450 | 0.2088 |
| 0.0460 | 0.2083 |
| 0.0470 | 0.2078 |
| 0.0480 | 0.2073 |
| 0.0490 | 0.2068 |
| 0.0500 | 0.2063 |
PL-100-C Gate Well Detail
| Gate Ø | Gage Dimension |
|---|---|
| .0270 | .2178 |
| .0280 | .2173 |
| .0290 | .2168 |
| .0300 | .2163 |
| .0310 | .2158 |
| .0320 | .2153 |
| .0330 | .2148 |
| .0340 | .2143 |
| .0350 | .2138 |
| .0360 | .2133 |
| .0370 | .2128 |
| .0380 | .2123 |
| .0390 | .2118 |
| .0400 | .2113 |
| .0410 | .2108 |
| .0420 | .2103 |
P-100DL Bushing
Description
Polyshot P-100DL Bushings are installed into a gate well detail machined into the “A” half of the mold by the mold maker. This bushing can also be fitted with a PR gate interface cap, to allow installation into a 1.0000″ diameter hole machined into the “A” half of the mold. The PR configuration will leave a slight “ring” witness line if gated directly into the part surface.
Bushing Body Section
Click on the part number below to download the files.
| Part Number | Heated "A" Length |
|---|---|
| P-100DL-0.875 | 0.875" |
| P-100DL-1.375 | 1.375" |
| P-100DL-1.875 | 1.875" |
| P-100DL-2.375 | 2.375" |
| P-100DL-2.875 | 2.875" |
| P-100DL-3.375 | 3.375" |
| P-100DL-3.875 | 3.875" |
| P-100DL-4.375 | 4.375" |
To order a P-100DL Series Heated Sprue Bushing, please submit a request for the quote below.
Gate Well Detail
| Gate Ø | Gage Dimension |
|---|---|
| 0.0270 | 0.2178 |
| 0.0280 | 0.2173 |
| 0.0290 | 0.2168 |
| 0.0300 | 0.2163 |
| 0.0310 | 0.2158 |
| 0.0320 | 0.2153 |
| 0.0330 | 0.2148 |
| 0.0340 | 0.2143 |
| 0.0350 | 0.2138 |
| 0.0360 | 0.2133 |
| 0.0370 | 0.2128 |
| 0.0380 | 0.2123 |
| 0.0390 | 0.2118 |
| 0.0400 | 0.2113 |
| 0.0410 | 0.2108 |
| 0.0420 | 0.2103 |
| 0.0430 | 0.2098 |
| 0.0440 | 0.2093 |
| 0.0450 | 0.2088 |
| 0.0460 | 0.2083 |
| 0.0470 | 0.2078 |
| 0.0480 | 0.2073 |
| 0.0490 | 0.2068 |
| 0.0500 | 0.2063 |
PR-100C Bushing
Description
Polyshot PR-100C Bushings are installed into a gate well detail machined into the “A” half of the mold by the mold maker. This bushing allows installation into a 1.0000″ diameter hole machined into the “A” half of the mold. The configuration will leave a slight “ring” witness line if gated directly into the part surface.
Bushing Body Section
Click on the part number below to download the files.
| Part Number | Heated "A" Length |
|---|---|
| PR-100C-875 | 0.875" |
| PR-100C-1.375 | 1.375" |
| PR-100C-1.875 | 1.875" |
| PR-100C-2.375 | 2.375" |
| PR-100C-2.875 | 2.875" |
| PR-100C-3.375 | 3.375" |
| PR-100C-3.875 | 3.875" |
| PR-100C-4.375 | 4.375" |
To order a PR-100C Series Heated Sprue Bushing, please submit a request for the quote below.
Gate Well Detail
| Gate Ø | Gage Dimension |
|---|---|
| 0.0270 | 0.2178 |
| 0.0280 | 0.2173 |
| 0.0290 | 0.2168 |
| 0.0300 | 0.2163 |
| 0.0310 | 0.2158 |
| 0.0320 | 0.2153 |
| 0.0330 | 0.2148 |
| 0.0340 | 0.2143 |
| 0.0350 | 0.2138 |
| 0.0360 | 0.2133 |
| 0.0370 | 0.2128 |
| 0.0380 | 0.2123 |
| 0.0390 | 0.2118 |
| 0.0400 | 0.2113 |
| 0.0410 | 0.2108 |
| 0.0420 | 0.2103 |
| 0.0430 | 0.2098 |
| 0.0440 | 0.2093 |
| 0.0450 | 0.2088 |
| 0.0460 | 0.2083 |
| 0.0470 | 0.2078 |
| 0.0480 | 0.2073 |
| 0.0490 | 0.2068 |
| 0.0500 | 0.2063 |
G Microbushing
Description
Polyshot G Microbushings are installed into a .375″ diameter hole machined into the “A” half of the mold. This bushing is also a direct replacement for existing molds that have been constructed with a cold sprue bushing.
This bushing also allows a runner to be machined into the face of the bushing by Polyshot in any configuration, with a maximum radius size of .0625”
Bushing Body Section
Click on the part number below to download the files.
| Part Number | Heated "A" Length |
|---|---|
| G-Micro-875 | 0.875" |
| G-Micro-1.375 | 1.375" |
| G-Micro-1.875 | 1.875" |
To order a G Microbushing Heated Sprue Bushing, please submit a request for the quote below.
Gate Well Detail
G-075SC Bushing
Description
Polyshot G-075SC Bushings are installed into a .7500″ diameter hole machined in the “A” half of the mold. This bushing is also a direct replacement for existing molds that have been constructed with a cold sprue bushing.
This bushing also allows a runner to be machined by Polyshot into the face of the bushing in any configuration, with a maximum radius size of .2500″.
Bushing Body Section
Click on the part number below to download the files.
| Part Number | Heated "A" Length |
|---|---|
| G-075SC-875 | 0.875" |
| G-075SC-1.375 | 1.375" |
| G-075SC-1.875 | 1.875" |
| G-075SC-2.375 | 2.375" |
| G-075SC-2.875 | 2.875" |
To order a G-075SC Series Heated Sprue Bushing, please submit a request for the quote below.
G-100C Bushing
Description
Polyshot G-100C Bushings are installed into a 1.0000″ diameter hole machined into the “A” half of the mold. This bushing is also a direct replacement for existing molds that have been constructed with a cold sprue bushing.
This bushing also allows a runner to be machined into the face of the bushing by Polyshot in any configuration, with a maximum radius size of .2500″.
Bushing Body Section
Click on the part number below to download the files.
| Part Number | Heated "A" Length |
|---|---|
| G-100C-875 | 0.875" |
| G-100C-1.375 | 1.375" |
| G-100C-1.875 | 1.875" |
| G-100C-2.375 | 2.375" |
| G-100C-2.875 | 2.875" |
| G-100C-3.375 | 3.375" |
| G-100C-3.875 | 3.875" |
| G-100C-4.375 | 4.375" |
To order a G-100C Series Heated Sprue Bushing, please submit a request for the quote below.
G-150C Bushing
Description
Polyshot G-150C Bushings are installed into a 1.5000″ diameter hole machined into the “A” half of the mold. This bushing is also a direct replacement for existing molds that have been constructed with a cold sprue bushing.
This bushing also allows a runner to be machined into the face of the bushing by Polyshot in any configuration, with a maximum radius size of .2500″.
The G-150C bushing is an excellent choice for large parts. The G-150C can process engineering resins with a part or shot weight up to 2 lbs.
Bushing Body Section
Click on the part number below to download the files.
| Part Number | Heated "A" Length |
|---|---|
| G-150C-875 | 0.875" |
| G-150C-1.375 | 1.375" |
| G-150C-1.875 | 1.875" |
| G-150C-2.375 | 2.375" |
| G-150C-2.875 | 2.875" |
| G-150C-3.375 | 3.375" |
| G-150C-3.875 | 3.875" |
| G-150C-4.375 | 4.375" |
To order a G-150C Series Heated Sprue Bushing, please submit a request for the quote below.
