Screws

[ 01 ]

Injection screws

We can supply a complete range of injection 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 design

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 parts. For this reason we can deliver screws with a Maxi Melt design that can help you to optimize your production.

[ 03 ]

Deliver better surface

Our screws can be delivered with all kind of treatments 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 fulfillment of these objectives to the purchase of the screw.

[ 04 ]

The advantage of our Injection 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.

Optional we can use coatings to reduce friction.

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

The modification of the screwprofile can improve the plasticizing process.

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.

MM code

Base Material

Treatment

Abrasive wear resistance

Corrosive wear resistance
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
Abrasive wear resistance

+
Corrosive wear resistance

+

MM41

MM code

MM41
Base Material

Quenced and Tempered
Treatment

Nitriding
Abrasive wear resistance

+
Corrosive wear resistance

+

MM34

MM code

MM34
Base Material

Quenced and Tempered
Treatment

Nitriding
Abrasive wear resistance

+
Corrosive wear resistance

+

MM39

MM code

MM39
Base Material

Quenced and Tempered
Treatment

Hardening
Abrasive wear resistance

+
Corrosive wear resistance

+
+
+

KPM1

MM code

KPM1
Base Material

Powder Metallurgy Steel
Treatment

Hardening
Abrasive wear resistance

+
+
+
+
+
Corrosive wear resistance

+
+
+

KPM2

MM code

KPM2
Base Material

Powder Metallurgy Steel
Treatment

Hardening
Abrasive wear resistance

+
+
+
+
Corrosive wear 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 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

MMFC

Coatings

MMFC
Surface Coating

Flash Chromium
Technology

Plating
Hardness µm

58/60 HRC
Thickness

0,02/0,03 MM
Color

High Polishing
Friction Coefficient Ra

0,17

MMTC

Coatings

MMTC
Surface Coating

Thickness Chromium
Technology

Plating
Hardness µm

58/60 HRC
Thickness

0,10/0,15MM
Color

High Polishing
Friction Coefficient Ra

0,17

MMCRN

Coatings

MMCRN
Surface Coating

ALCRN
Technology

Pvd
Hardness µm

2800-3200 HV
Thickness

2-8 µm
Color

Violet
Friction Coefficient Ra

0,35

MMZRN

Coatings

MMZRN
Surface Coating

ZRN
Technology

Pvd
Hardness µm

2600-3100 HV
Thickness

2-4 µm
Color

Clear Yellow
Friction Coefficient Ra

0,45

MMTIN

Coatings

MMTIN
Surface Coating

TIN
Technology

Pvd
Hardness µm

2000-2500 HV
Thickness

2-4 µm
Color

Gold Yellow
Friction Coefficient Ra

0,45

MMNOX

Coatings

MMNOX
Surface Coating

CRNOX
Technology

Pvd
Hardness µm

2000-2500 HV
Thickness

2-4 µm
Color

Iridescent Rainbow
Friction Coefficient Ra

0,25

MMHDLC

Coatings

MMHDLC
Surface Coating

HDLC
Technology

Pvd
Hardness µm

5000 HV
Thickness

1-3 µm
Color

Black Rainbow
Friction Coefficient Ra

0,05/0,15

MMEXT

Coatings

MMEXT
Surface Coating

HDLC
Technology

Arco
Hardness µm

2500 HV
Thickness

2-6 µm
Color

Grey
Friction Coefficient Ra

0,3/0,4

Examples screws

We have five different alloy solutions listed in the tables below. We qualified the quality of the different alloys according abrasion and or corrosion resistance to enable a quick selection.