Square Coil Heater for Hot Runner Nozzles & Injection Molding

Square Coil Heater is a precision heating element designed for hot runner nozzles, injection molds and continuous-production heating applications. Its square cross-section provides a larger contact surface compared with conventional round coil designs, improving heat transfer efficiency and helping maintain stable temperature performance.

Available in 3.0×3.0 mm, 3.3×3.3 mm, 3.5×3.5 mm and 4.0×4.0 mm cross-sections, this heating element can be customized according to heating length, inner diameter, voltage, wattage and lead-wire requirements.

Square Coil Heater Features

• Square cross-section available in 3.0×3.0 mm, 3.3×3.3 mm, 3.5×3.5 mm and 4.0×4.0 mm
• Larger contact surface for efficient heat transfer
• Suitable for continuous-production hot runner systems
• Inner diameter tolerance of ±0.20 mm
• Minimum bending radius of ≥10 mm
• Maximum actual working temperature up to 520°C
• Maximum actual watt density up to 8 W/cm²
• Standard 300 mm lead length, customizable
• PTFE high-temperature lead wire with optional stainless steel braided sleeve
• K-type or J-type thermocouple available as an option
• Custom heating length, voltage, wattage and lead configuration available

Product Specifications

Square Coil Heater Applications

This configuration is especially suitable for applications where stable contact, efficient heat transfer and consistent thermal performance are required.

• Medium-size hot runner nozzles
• Continuous-production injection molds
• Packaging machinery nozzle heating
• Plastic injection molding equipment
• Hot runner systems requiring higher watt density
• Industrial heating assemblies with cylindrical installation areas

Coil Heater Series

The square configuration is one of five coil heater designs available from EaseWise. Selection depends on the required contact area, installation space, flexibility and thermal performance.

• 
  Round Coil Heater
  
  – flexible cylindrical heating for hot runner nozzles and manifold sleeves.
• 
  Flat Rectangular Coil Heater
  
  – designed for narrow installation gaps and applications requiring a larger contact area.
• 
  Micro Mini Coil Heater
  
  – compact heating for miniature hot runner systems and limited installation spaces.
• 
  Pressed-in Brass Coil Heater
  
  – rigid close-contact installation for precision molds and repeatable thermal performance.
• 
  Hot Runner Spring Coil Heater
  
  – flexible spring-style heating with brass sleeve and thermocouple options for hot runner nozzles.

Coil Heater Selection Guide

Choosing the right coil heater depends on nozzle size, installation space, required heat transfer performance and production requirements.

Coil Heater Series Comparison Guide

provides a comparison of different coil heater structures, including round, square, flat rectangular, micro mini and pressed-in brass designs.

Request a Square Coil Heater Quote

Need a standard configuration or a custom heating element?

Send us your required cross-section, inner diameter, heating length, voltage, wattage and quantity. Our engineering team can recommend a suitable square coil heater configuration and provide a quotation.

Custom square coil heaters are available for hot runner nozzles, injection molding systems and precision industrial heating applications.