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Kuteno Kunststoff Messe, Gemany — May 14 - 16, 2024
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Kunstoffenbeurs Brabenthallen 2024, Nederland — September 18 - 19, 2024
The K Show at Stand A03 in Hall 10- Dusseldorf, Germany — October 08 - 15, 2025
[ 01 ]
Single screws

We can supply a complete range of extrusion screws. Based on our large experience we can recommend the proper type of steel and surface treatment to minimize wear. According to customer’s needs we can propose nitriding steel, stainless steel, tool steel and also sintered steels (CPM/PM).

[ 02 ]
Screws according to OEM’s specifications

We deliver screws according to OEM’s specification.A screw is the heart of the process and determines the the productivity and the quality of the molded parta. For this reason we can deliver screws with a Maxi Melt design that can help you to optimise your production.

[ 03 ]
Deliver better surface

Our screws can be delivers with all kind of treatmenst to improve surface conditions and to improve plasticizing. A beter surface finish will improve plasticizing and reduce reject rate. All these improvements are just standard for us, so that we can bind the fulfilment of these objectives to the purchase of the screw.

[ 04 ]
The advantage of our extrusion screws

Up to date machinery and CAD CAM facilities make it possible to manufacture high quality complex products with tight tolerances from different kind of materials to be selected from case to case with a high surface finish suitable to withstand wear and or corrosion conditions

The modification of the screwprofile can improve the plasticizing process.

Improved durability by using hardened, powder metallurgical materials and welding with tungsten carbide alloys on the flight-tops.

Optional we can use coatings to reduce friction.

Materials for plasticizing screws

Choosing the right screw material is important to have the right plasticizing performance in order to reduce wear and corrosion problems

  • DIN standard
    Material
    Type steel
    Treatment
    Hardness
    Abrasion resistance
    (x good) to (xxxxx excellent)
    Corrosion resistance
    (x good) to (xxxxx excellent)
  • 1.8509
    41CrAIMo7
    Nitriding steel
    Nitrided
    >850 HV1
    +
    +
  • 1.8519
    31CrMoV9
    Nitriding steel
    Nitrided
    >700 HV1
    +
    +
  • 1.8550
    34CrAINi7
    Nitriding steel
    Nitrided
    >850 HV1
    +
    +
  • 1.4122
    X35CrMo17
    Stainless Steel
    Ionitrided
    950-1100 HV1
    +
    +++
  • 1.2379
    X155CrVMo121
    Tool steel
    Hardened
    59 - 63 HRC
    +++
    ++
  • -
    KPM1
    PM material
    Hardened
    58 - 63 HRC
    ++++
    +++
  • -
    KPM2
    PM material
    Hardened
    55 - 60 HRC
    ++++
    +++++
1.8509
  • Din standard
    1.8509
  • Material
    41CrAIMo7
  • Type steel
    Nitriding steel
  • Treatment
    Nitrided
  • Hardness
    >850 HV1
  • Abrasion resistance
    +
  • Corrosion resistance
    +
1.8519
  • Din standard
    1.8519
  • Material
    31CrMoV9
  • Type steel
    Nitriding steel
  • Treatment
    Nitrided
  • Hardness
    >700 HV1
  • Abrasion resistance
    +
  • Corrosion resistance
    +
1.8550
  • Din standard
    1.8550
  • Material
    34CrAINi7
  • Type steel
    Nitriding steel
  • Treatment
    Nitrided
  • Hardness
    >850 HV1
  • Abrasion resistance
    +
  • Corrosion resistance
    +
1.4122
  • Din standard
    1.4122
  • Material
    X35CrMo17
  • Type steel
    Stainless Steel
  • Treatment
    Ionitrided
  • Hardness
    950-1100 HV1
  • Abrasion resistance
    +
  • Corrosion resistance
    +
    +
    +
1.2379
  • Din standard
    1.2379
  • Material
    X155CrVMo121
  • Type steel
    Tool steel
  • Treatment
    Hardened
  • Hardness
    59 - 63 HRC
  • Abrasion resistance
    +
    +
    +
  • Corrosion resistance
    +
    +
-
  • Din standard
    -
  • Material
    KPM1
  • Type steel
    PM material
  • Treatment
    Hardened
  • Hardness
    58 - 63 HRC
  • Abrasion resistance
    +
    +
    +
    +
  • Corrosion resistance
    +
    +
    +
-
  • Din standard
    -
  • Material
    KPM2
  • Type steel
    PM material
  • Treatment
    Hardened
  • Hardness
    55 - 60 HRC
  • Abrasion resistance
    +
    +
    +
    +
  • Corrosion resistance
    +
    +
    +
    +
    +

Welding materials for the screw flights

For larger screw sizes we often use nitrided materials with the flighttips welded welded with different materials options. This done to create wear/corrosion protecting or improve friction/lubrication

  • Type
    Base Alloy
    Alloy components
    Hardness [HRC]
    (a) Hardness of matrix, tungsten carbides have a hardness of 89 HRC.
    Abrasion resistance
    (x good) to (xxxxx excellent)
    Corrosion resistance
    (x good) to (xxxxx excellent)
  • Stellite 1
    Cobalt
    C - Cr - W
    52 - 57
    +++
    +++
  • Stellite 12
    Cobalt
    C - Cr - W
    44 - 48
    ++
    +++
  • Colmonoy 56
    Nickel
    C - Si - Cr - B - Fe
    52 - 56
    +++
    ++++
  • Colmonoy 83
    Nickel
    Tungsten carbide
    56 - 60 [a]
    +++++
    ++++
  • CastoTIG 5
    Iron
    Cr - V
    58 - 62
    ++++
    ++
Stellite 1
  • Type
    Stellite 1
  • Base Alloy
    Cobalt
  • Alloy components
    C - Cr - W
  • Hardness [HRC]
    52 - 57
  • Abrasion resistance
    +
    +
    +
  • Corrosion resistance
    +
    +
    +
Stellite 12
  • Type
    Stellite 12
  • Base Alloy
    Cobalt
  • Alloy components
    C - Cr - W
  • Hardness [HRC]
    44 - 48
  • Abrasion resistance
    +
    +
  • Corrosion resistance
    +
    +
    +
Colmonoy 56
  • Type
    Colmonoy 56
  • Base Alloy
    Nickel
  • Alloy components
    C - Si - Cr - B - Fe
  • Hardness [HRC]
    52 - 56
  • Abrasion resistance
    +
    +
    +
  • Corrosion resistance
    +
    +
    +
    +
Colmonoy 83
  • Type
    Colmonoy 83
  • Base Alloy
    Nickel
  • Alloy components
    Tungsten carbide
  • Hardness [HRC]
    56 - 60 [a]
  • Abrasion resistance
    +
    +
    +
    +
    +
  • Corrosion resistance
    +
    +
    +
    +
CastoTIG 5
  • Type
    CastoTIG 5
  • Base Alloy
    Iron
  • Alloy components
    Cr - V
  • Hardness [HRC]
    58 - 62
  • Abrasion resistance
    +
    +
    +
    +
  • Corrosion resistance
    +
    +

Screw coatings

In most cases these coatings are used to reduce friction, and therefore improve the plasticizing, or protect against corrosion

  • Coatings
    Thickness of layer [MM]
    Hardness
    Abrasion resistance
    (x good) to (xxxxx excellent)
    Corrosion resistance
    (x good) to (xxxxx excellent)
  • Chrome plating
    0,020 – 0,035
    800 – 1100 HV 0,1
    ++++
    +++
  • Nickel plating
    0,015 – 0,025
    500 – 600 HV 0,1
    ++
    +++++
  • PVD, TiN
    0,004
    2500 HV 0,5
    +++
    ++
  • PVD, CrN
    0,004
    2100 HV 0,5
    +++
    +++
  • PVD, CrN-multi layer
    0,008
    2100 HV 0,5
    ++++
    ++++
Chrome plating
  • Coatings
    Chrome plating
  • Thickness of layer [MM]
    0,020 – 0,035
  • Hardness
    800 – 1100 HV 0,1
  • Abrasion resistance
    +
    +
    +
    +
  • Corrosion resistance
    +
    +
    +
Nickel plating
  • Coatings
    Nickel plating
  • Thickness of layer [MM]
    0,015 – 0,025
  • Hardness
    500 – 600 HV 0,1
  • Abrasion resistance
    +
    +
  • Corrosion resistance
    +
    +
    +
    +
    +
PVD, TiN
  • Coatings
    PVD, TiN
  • Thickness of layer [MM]
    0,004
  • Hardness
    2500 HV 0,5
  • Abrasion resistance
    +
    +
    +
  • Corrosion resistance
    +
    +
PVD, CrN
  • Coatings
    PVD, CrN
  • Thickness of layer [MM]
    0,004
  • Hardness
    2100 HV 0,5
  • Abrasion resistance
    +
    +
    +
  • Corrosion resistance
    +
    +
    +
PVD, CrN-multi layer
  • Coatings
    PVD, CrN-multi layer
  • Thickness of layer [MM]
    0,008
  • Hardness
    2100 HV 0,5
  • Abrasion resistance
    +
    +
    +
    +
  • Corrosion resistance
    +
    +
    +
    +

Example screws

Based on all material and treatment options we selected some examples screw configuration versus polymer processing.

Extrusion screw 1

Extrusion 3 Zone screw with mixer for processing PP profiles

Details
Extrusion screw 1
Contact us
  • Alloy
    1,8509
  • Alloy components
    Cr - AI
  • Hardness [HRC]
    950-1100 Hv (65-67 HRC)
  • Size [mm]
    Ø 60
  • Abrasion resistance
    +
  • Corrosion resistance
    +
Extrusion screw 2

Extrusion screw with 2 mixers for processing LLDPE with masterbatch. Blowfilmapplication.

Details
Extrusion screw 2
Contact us
  • Alloy
    1,8550
  • Alloy components
    Cr - AI
  • Hardness [HRC]
    950-1100 Hv (65-67 HRC)
  • Size [mm]
    Ø 75
  • Abrasion resistance
    +
  • Corrosion resistance
    +
Extrusion screw 3

Extrusion screw for processing rubber.

Details
Extrusion screw 3
Contact us
  • Alloy
    1,8509
  • Alloy components
    Cr - AI
  • Hardness [HRC]
    950-1100 Hv (65-67 HRC)
  • Size [mm]
    Ø 60
  • Abrasion resistance
    +
  • Corrosion resistance
    +
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