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40mm Nissei Screws in Injection Molding - Call Now - 770-417-6983

  • megan15067
  • Feb 27
  • 3 min read

www.completeplastics.com, sales@completeplastics.com. Injection molding machines rely heavily on the precision and durability of their screws. For many Nissei machines, a 40mm diameter screw with a total length of approximately 34.50 inches (about 876mm) is a key component. This screw size fits a range of Nissei models, supporting clamping forces from 80 to 125 tons. Understanding the specifications and compatibility of these screws helps maintain machine performance and ensures quality production.


Close-up view of a 40mm Nissei injection molding screw showing detailed flight design
40mm Nissei injection molding screw with 34.5 inch length

40mm Nissei Screws in Injection Molding


The 40mm screw is common in several Nissei injection molding machines, especially those designed for mid-range tonnage. Here are some specific models where this screw size is frequently used:


  • FNX110-12A Series

This hybrid model, rated at 123 tons, often uses a 40mm general-purpose (GP) screw either as a standard or optional part. The screw supports a wide range of materials and processing conditions.


  • FN2000-25A and FN3000-25A

These hydraulic machines stock 40mm replacement screws regularly. Their design benefits from the screw’s balance of length and diameter, which helps maintain consistent melt quality.


  • NEX110 and NEX180

The all-electric NEX series uses 40mm screws for mid-range tonnage applications. These screws contribute to energy-efficient and precise molding cycles.


  • Older 80-Ton Models

Some vintage Nissei machines from around 1989 also use 40mm diameter screws. These older units require compatible replacement parts to extend their service life.


Technical Details That Matter


Understanding the technical specifications of the 40mm Nissei screw helps in selecting the right replacement or upgrade.


  • Length and L/D Ratio

The total length of 34.5 inches (876mm) typically corresponds to an L/D (length-to-diameter) ratio of 18:1 or 20:1. This ratio is standard for general-purpose screws in machines of this size, balancing melting efficiency and material throughput.


  • Overall Length vs Flighted Length

The 34.5-inch measurement usually refers to the overall length, including the shank. The flighted length, which is the portion of the screw with the helical grooves, is shorter. This distinction is important when matching screws to barrels.


  • Screw Tip Assembly

These screws often pair with a 40mm 3-piece screw tip assembly featuring a TR24 x 3.0mm left-hand thread. This design allows for easy replacement of worn tips without changing the entire screw.


Why Choose the 40mm Screw for Your Nissei Machine?


The 40mm screw size offers several advantages for injection molding operations:


  • Versatility

It fits a wide range of Nissei machines, from older 80-ton models to newer hybrid and electric units. This makes it a reliable choice for shops with mixed equipment.


  • Material Compatibility

The screw’s length and diameter support processing of various thermoplastics, including engineering resins and commodity plastics.


  • Performance Balance

The L/D ratio and screw design promote efficient melting and mixing, which improves part quality and reduces cycle times.


  • Availability

Replacement screws and tip assemblies are readily available, reducing downtime when maintenance is needed.


Tips for Maintaining Your 40mm Nissei Screw


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Proper care extends the life of your injection molding screw and keeps your machine running smoothly:


  • Regular Inspection

Check for wear on the flights and tip. Excessive wear can cause poor melt quality and inconsistent shot sizes.


  • Clean Thoroughly

Residue buildup affects screw performance. Use recommended cleaning agents and follow manufacturer guidelines.


  • Use Compatible Tips

When replacing tips, ensure they match the TR24 x 3.0mm LH thread specification to maintain proper fit and function.


  • Monitor Processing Conditions

Avoid running the machine outside recommended temperature and pressure ranges to prevent premature screw damage.


How to Order Replacement Screws


If you need a 40mm Nissei screw with a total length of 34.5 inches, contact suppliers who specialize in injection molding parts. For example, Complete Plastics offers these screws and related components. You can reach them at:


They provide expert advice to help you select the correct screw for your machine model and application.


Summary


A 40mm diameter screw with a 34.5-inch length is a vital part for many Nissei injection molding machines, especially those with clamping forces between 80 and 125 tons. This screw size fits models like the FNX110-12A, FN2000-25A, FN3000-25A, and the NEX series, as well as some older 80-ton units. Its design supports efficient melting and consistent molding performance.


 
 
 

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