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Essential Guide to 45mm Negri Bossi Tip Assembly and Compatible Molding Machines

  • Heat Tech
  • Feb 23
  • 3 min read

www.completeplastics.com, sales@completeplastics.com, 770-417-6983. Injection molding machines rely on precise components to deliver consistent, high-quality results. One such critical component is the 45mm Negri Bossi tip assembly. This part fits specific machine models that use a 45mm diameter screw, ensuring smooth material flow and proper nozzle function. Understanding the specifications, compatibility, and applications of this tip assembly helps operators and maintenance teams keep their molding processes efficient and reliable.


Close-up view of a 45mm Negri Bossi tip assembly showing thread pitch and tip angle
Detailed view of 45mm Negri Bossi tip assembly with thread pitch and tip angle

Essential Guide to 45mm Negri Bossi Tip Assembly and Compatible Molding Machines


The 45mm Negri Bossi tip assembly is a nozzle component designed for injection molding machines that use a 45mm diameter screw. The tip assembly controls the flow of molten plastic from the screw into the mold cavity. It features a tip angle of 15 degrees and an overall length (OAL) of approximately 6.15 inches. The thread pitch is specified as M32x2 Left Hand, which ensures secure attachment to the machine’s nozzle body.


Key dimensions include:


  • Check Ring Outer Diameter (OD): Approximately 2.753 to 2.754 inches

  • Overall Length: Roughly 8.22 inches


Essential Guide to 45mm Negri Bossi Tip Assembly and Compatible Molding Machines - These precise measurements guarantee compatibility and proper sealing during the injection process, preventing leaks and ensuring consistent molding cycles.


Why the 45mm Diameter Matters


The screw diameter in an injection molding machine affects the volume of material that can be melted and injected per cycle. A 45mm screw is common in medium-sized molding machines, balancing throughput and precision. The tip assembly must match this diameter to fit correctly and maintain the integrity of the melt flow path.


Using a tip assembly designed for a different screw size can cause poor sealing, material leakage, or uneven flow, leading to defects in molded parts. Therefore, selecting the correct 45mm Negri Bossi tip assembly is essential for machines with this screw size.


Compatible Machine Models


Several Negri Bossi injection molding machine series use the 45mm screw diameter and are compatible with this tip assembly. These include:


  • Canbio Series

The Canbio 160T model frequently uses a 45mm screw diameter. This series is popular for its reliability and precision in medium tonnage molding applications.


  • NB Series

The NB 150 is a legacy model that commonly features a 45mm screw. Despite its age, it remains in use in many facilities due to its robust design.


  • V Series

Certain configurations of the V160 Canbio utilize a 45mm screw and tip assembly, offering versatility for different molding needs.


  • TEC Series

Smaller tonnage models like the 150TEC and 210TEC are compatible with various 45mm nozzle and tip components, making them suitable for detailed molding tasks.


  • SV Series

The 80SV and 150SV models often overlap in screw sizing that includes 45mm options, providing flexibility for different production volumes.


Knowing which machines use this tip assembly helps maintenance teams source the right parts quickly and avoid downtime.

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How to Identify the Correct Tip Assembly


When replacing or ordering a 45mm Negri Bossi tip assembly, verify the following:


  • Thread Pitch: Confirm the M32x2 Left Hand thread matches your machine’s nozzle body.

  • Tip Angle: The 15-degree angle is standard for this assembly and affects how the molten plastic flows into the mold.

  • Dimensions: Check the overall length and check ring OD to ensure a proper fit.


If any of these specifications differ, the tip assembly may not seal correctly or could cause damage to the machine.


Maintenance Tips for Tip Assemblies


Proper care extends the life of your tip assembly and maintains molding quality:


  • Regular Cleaning: Residue buildup can block the nozzle and affect flow. Use recommended cleaning agents and tools.

  • Inspect for Wear: Look for signs of erosion or damage on the tip angle and threads. Replace if worn.

  • Check Seals: Ensure the check ring and sealing surfaces are intact to prevent leaks.

  • Use Genuine Parts: Always source tip assemblies from trusted suppliers like Complete Plastics to guarantee compatibility and quality.


Where to Buy 45mm Negri Bossi Tip Assemblies


Reliable suppliers provide genuine parts with technical support. For example, Complete Plastics offers 45mm Negri Bossi tip assemblies with detailed specifications and customer service. You can contact them via:


Ordering from reputable sources ensures you receive parts that meet exact standards and fit your machines perfectly.


Practical Example: Using the Tip Assembly in a Canbio 160T


A molding facility running a Canbio 160T machine noticed inconsistent part quality and occasional leaks around the nozzle. After inspection, the maintenance team found the tip assembly worn and slightly mismatched in thread pitch. Replacing it with a genuine 45mm Negri Bossi tip assembly restored proper sealing and improved cycle consistency. The team also adjusted cleaning schedules to prevent future buildup.


This example shows how matching the right tip assembly to the machine model and maintaining it can prevent costly production issues.


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