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Screws

  • For all machine manufacturers.
  • Original screw equivalent or according to your specifications.
  • Special versions for abrasion resistance.

VN Series

Nitrided Screws

Application: Recommended for unfilled plastics.

  • Classic manufacturing from steel 1.8509 with 96 hours of nitriding and a 0.5 mm deep nitrided layer.
  • Suitable for general applications.

Options :

  • PVD coating
  • Chrome

VT Series

Bimetal & Through-Hardened Screws

Application: Recommended for filled plastics.

  • Bimetal screws: armored core screws with a 10% tungsten carbide alloy.
  • Through-hardened screws: made from high-alloy tool steel 1.2379 and fully hardened.
  • Hardness: 58–60 HRC.
  • Excellent wear resistance for processing filled plastics.

Options:

  • PVD coating
  • Chrome

VH9 Series

Carbide Screws

Application: Recommended for reinforced plastics with over 30% glass fiber content.

  • Screws fully coated with tungsten carbide.
  • The tungsten carbide coating is applied using HVOF (High-Velocity Oxygen Fuel) thermal spraying.
  • Thickness of tungsten carbide armor layer: 0.15 mm or 0.3 mm on the diameter.
    The base material of the screw is made of through-hardened tool steel.
  • Currently the most successful process worldwide.

Options:

  • PVD coating
  • Chrome

High Wear-Resistant Screw VH9

  • Screws with a 90% tungsten carbide alloy.
  • Hardness: 1400 HV (Vickers) or 70–75 HRC.
  • Three to five times longer service life compared to bimetal and through-hardened screws when processing materials with at least 15% glass fiber content.

What is the composition of this alloy?

The microstructure consists of fine tungsten carbide particles measuring 2 to 5 microns, embedded in a cobalt-based alloy.

Is there a risk of coating breakage?

The hard metal is embedded in an elastic alloy and is characterized by high impact resistance. The risk of breakage is low. However, depending on the application, occasional breakage may occur, especially during high-temperature cleaning or if the screw is subjected to excessive bending stress.
Additionally, polycarbonate and other adhesives are not suitable.

Will this screw wear the barrel faster?

Contrary to expectations, alloys made from fine tungsten carbide powder particles are less aggressive on the barrel.
See abrasion tests performed according to ASTM G77.

Download the quotation request form below and send it completed to the email address commercial@abcdirect.eu

Quotation request form (PDF)

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