Single screw

[ 01 ]

Single screws

We can supply a complete range of extrusion screws. Based on our extensive experience, we can recommend the proper type of steel and surface treatment to minimize wear. According to customers’ 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 productivity and the quality of the molded parts. For this reason, we can deliver screws with a Maxi Melt design to help you optimize your production.

[ 03 ]

Deliver better surface

Our screws can be delivered with various treatments to improve surface conditions and plasticization. A better surface finish will improve plasticizing and reduce the reject rate. All these improvements are standard for us, so we can link the fulfillment 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

Modifying the screw profile 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 for achieving the right plasticizing performance to reduce wear and corrosion problems.

MM Code

Base Material

Treatment

Abrasion resistance

(x good) to (xxxxx excellent)

Corrosion resistance

(x good) to (xxxxx excellent)
MM31

Quenced and Tempered

Nitriding

+

+
MM41

Quenced and Tempered

Nitriding

+

+
MM34

Quenced and Tempered

Nitriding

+

+
MM39

Quenced and Tempered

Hardening

+

+++
KPM1

Powder Metallurgy Steel

Hardening

+++++

+++
KPM2

Powder Metallurgy Steel

Hardening

++++

++++++

MM31

MM Code

MM31
Base Material

Quenced and Tempered
Treatment

Nitriding
Abrasion resistance

+
Corrosion resistance

+

MM41

MM Code

MM41
Base Material

Quenced and Tempered
Treatment

Nitriding
Abrasion resistance

+
Corrosion resistance

+

MM34

MM Code

MM34
Base Material

Quenced and Tempered
Treatment

Nitriding
Abrasion resistance

+
Corrosion resistance

+

MM39

MM Code

MM39
Base Material

Quenced and Tempered
Treatment

Hardening
Abrasion resistance

+
Corrosion resistance

+
+
+

KPM1

MM Code

KPM1
Base Material

Powder Metallurgy Steel
Treatment

Hardening
Abrasion resistance

+
+
+
+
+
Corrosion resistance

+
+
+

KPM2

MM Code

KPM2
Base Material

Powder Metallurgy Steel
Treatment

Hardening
Abrasion resistance

+
+
+
+
Corrosion resistance

+
+
+
+
+
+

Welding materials for the screw flights

For larger screw sizes, we often use nitrided materials, with the flight tips welded from different material options. This creates wear/corrosion protection or improves friction/lubrication.

MM CODE

FLIGHT ARMORING

TECHNOLOGY

ABRASIVE WEAR RESISTANCE

CORROSIVE WEAR RESISTANCE
MM120

Cobalt Base Alloy

PTA

+++

+++
MM50

Iron Base Alloy

TIG

++++

++
MM560

Nickel Base Alloy

PTA

++++

++++
MM570

Nickel Base Alloy

PTA

++++++

+++++
MM830

Nickel Base Alloy

PTA

+++++

+++++
MM4900

Molybdenum

HVOF

+++++

++++
MM6000

Tungsten Carbide

HVOF

++++++

++++++

MM120

MM CODE

MM120
FLIGHT ARMORING

Cobalt Base Alloy
TECHNOLOGY

PTA
ABRASIVE WEAR RESISTANCE

+
+
+
CORROSIVE WEAR RESISTANCE

+
+
+

MM50

MM CODE

MM50
FLIGHT ARMORING

Iron Base Alloy
TECHNOLOGY

TIG
ABRASIVE WEAR RESISTANCE

+
+
+
+
CORROSIVE WEAR RESISTANCE

+
+

MM560

MM CODE

MM560
FLIGHT ARMORING

Nickel Base Alloy
TECHNOLOGY

PTA
ABRASIVE WEAR RESISTANCE

+
+
+
+
CORROSIVE WEAR RESISTANCE

+
+
+
+

MM570

MM CODE

MM570
FLIGHT ARMORING

Nickel Base Alloy
TECHNOLOGY

PTA
ABRASIVE WEAR RESISTANCE

+
+
+
+
+
+
CORROSIVE WEAR RESISTANCE

+
+
+
+
+

MM830

MM CODE

MM830
FLIGHT ARMORING

Nickel Base Alloy
TECHNOLOGY

PTA
ABRASIVE WEAR RESISTANCE

+
+
+
+
+
CORROSIVE WEAR RESISTANCE

+
+
+
+
+

MM4900

MM CODE

MM4900
FLIGHT ARMORING

Molybdenum
TECHNOLOGY

HVOF
ABRASIVE WEAR RESISTANCE

+
+
+
+
+
CORROSIVE WEAR RESISTANCE

+
+
+
+

MM6000

MM CODE

MM6000
FLIGHT ARMORING

Tungsten Carbide
TECHNOLOGY

HVOF
ABRASIVE WEAR RESISTANCE

+
+
+
+
+
+
CORROSIVE WEAR RESISTANCE

+
+
+
+
+
+

Screw coatings

In most cases, these coatings reduce friction, improve plasticizing, or protect against corrosion.

Coatings

Surface Coating

Technology

Hardness µm

Thickness

Color

Friction Coefficient Ra
MMFC

Flash Chromium

Plating

58/60 HRC

0,02/0,03 MM

High Polishing

0,17
MMTC

Thickness Chromium

Plating

58/60 HRC

0,10/0,15MM

High Polishing

0,17
MMCRN

ALCRN

Pvd

2800-3200 HV

2-8 µm

Violet

0,35
MMZRN

ZRN

Pvd

2600-3100 HV

2-4 µm

Clear Yellow

0,45
MMTIN

TIN

Pvd

2000-2500 HV

2-4 µm

Gold Yellow

0,45
MMNOX

CRNOX

Pvd

2000-2500 HV

2-4 µm

Iridescent Rainbow

0,25
MMHDLC

HDLC

Pvd

5000 HV

1-3 µm

Black Rainbow

0,05/0,15
MMEXT

HDLC

Arco

2500 HV

2-6 µm

Grey

0,3/0,4