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Injection molding screw

Injection Molding Screw Barrel

Injection molding screw barrels are manufactured for plasticizing units used in injection molding machines. Available material and surface-treatment options include 38CrMoAlA, SKD61, Cr12MoV, SACM645, nickel-based alloys, nitriding, chrome plating and bimetallic treatments, depending on the processed material and working conditions. Custom manufacturing and technical matching can be reviewed according to machine models, drawings, photos, samples or measured dimensions.

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Product Overview

Injection molding screw barrels are core plasticizing components inside injection molding machines. They are responsible for material conveying, melting, mixing, plasticizing and injection preparation before the molten plastic enters the mold.

Nanhaiya manufactures custom injection molding screw barrels according to machine model, drawings, samples or measured dimensions. The screw barrel design can be reviewed based on processed material, screw diameter, L/D ratio, shot requirement, wear condition and injection molding application.

Our engineering team can review injection molding machine information, screw barrel photos, drawings, samples or measured dimensions to support quotation and technical evaluation. Whether the application involves general-purpose plastics, engineering plastics, recycled plastics or filled compounds, the final screw and barrel design should be matched to the processed material, plasticizing unit and working conditions.

Full Technical Specifications

Parameter Value
Product Type Screw and barrel for injection molding machines
Conventional Materials 38CrMoAlA, SKD61, Cr12MoV, SACM645, nickel-based alloy and GH113
Nitriding Hardness HV900–1000
Nitriding Depth 0.5–0.8 mm
Quenching Hardness HRC55–62, where applicable
Nitriding Brittleness ≤ Grade 2
Surface Roughness Ra0.4
Screw Straightness 0.015 mm
Chrome Plating Hardness ≥950 HV, where applicable
Chrome Plating Thickness 0.05–0.10 mm, where applicable
Alloy Layer Depth 0.8–2.0 mm, where applicable
Machine Matching Confirmed according to injection molding machine model, drawings, samples or measured dimensions
Final Specification Note Final specifications should be confirmed according to machine model, injection volume, processed material, screw and barrel dimensions and working conditions.

Final specifications should be confirmed by Nanhaiya engineering before production.

Suitable Applications

This product is commonly used for the following applications, depending on material, machine model and processing conditions. Explore related applications on our Screw Barrel Applications page.

Injection molded products
Engineering plastics
Glass-fiber-filled plastics
General plasticizing units

Common Processing Issues

1

Poor plasticizing quality

Solution: Uneven melting, unstable plasticizing or poor material mixing may require screw design review based on material and molding conditions.

2

Unstable injection volume

Solution: Screw wear, barrel wear, back pressure, material condition or plasticizing unit mismatch can affect shot consistency.

3

Black spots or material degradation

Solution: Material retention, overheating, screw design mismatch or barrel wear may contribute to processing defects.

4

High wear with filled materials

Solution: Glass fiber, mineral filler, flame-retardant or recycled materials may increase screw and barrel wear.

5

Specification confirmation

Solution: When original drawings are unavailable, machine information, photos, samples and measured dimensions can support specification review and manufacturing confirmation.

Material Options

Nanhaiya manufactures injection molding screw barrel components from the following materials:

38CrMoAlA Nitrided Steel (Standard)

38CrMoAlA is a commonly used material for injection molding screw and barrel components. After appropriate heat treatment and nitriding, the confirmed surface specifications include a nitriding hardness of HV900–1000, a nitriding depth of 0.5–0.8 mm and nitriding brittleness of ≤ Grade 2. Final material and treatment selection should be confirmed according to the processed material and working conditions.

SKD61 Hot Work Tool Steel

SKD61 is available as an optional hot-work tool steel. Its suitability should be reviewed according to processing temperature, material formulation, component design, heat-treatment process and working conditions.

Cr12MoV Cold Work Tool Steel

Cr12MoV is available as an optional cold-work tool steel. Its suitability should be reviewed according to wear requirements, component design, processed material and working conditions.

SACM645 Nitrided Steel

SACM645 is available as an optional nitriding steel. Material selection and final surface specifications should be confirmed according to the processed material, component design and working conditions.

Ni-Based Alloy

Nickel-based alloy options can be reviewed for screw surfaces or barrel inner-bore applications where additional wear, corrosion or temperature resistance may be required. Final alloy selection should be confirmed according to the processed material and working conditions.

GH113

GH113 is listed as an available material option for injection molding screw and barrel components. Its suitability, heat treatment and application conditions should be confirmed through engineering review before production.

Final material selection should be confirmed depending on processed material, machine model, screw design and working conditions.

Surface Treatment Options

Nitriding Treatment

Nitriding can be reviewed as a surface-treatment option for injection molding screw and barrel components. The confirmed catalog specifications include a nitriding hardness of HV900–1000, a nitriding depth of 0.5–0.8 mm, nitriding brittleness of ≤ Grade 2 and surface roughness of Ra0.4. Final treatment selection should be confirmed according to the component material, processed material and working conditions.

Hard Chrome Plating

Hard chrome plating can be reviewed where additional surface requirements apply. The confirmed catalog specifications include a chrome plating hardness of ≥950 HV and a chrome layer thickness of 0.05–0.10 mm. Final suitability should be confirmed according to the component material, processed material and working conditions.

Bimetallic Alloy Layer

A bimetallic alloy layer can be reviewed where additional wear or service-life requirements apply. The confirmed catalog alloy-layer depth is 0.8–2.0 mm. Final alloy selection, application area and manufacturing process should be confirmed according to the component design, processed material and working conditions.

Alloy Spray Welding

Alloy spray welding may be reviewed for selected screw surfaces where additional surface performance is required. The alloy material, treatment area and technical specification should be confirmed through engineering review according to the component design, processed material and working conditions. For additional information, see our alloy spray welding service page.

Final surface treatment selection should be confirmed depending on processed material, machine model, screw design and working conditions.

Customization Options

Nanhaiya can review injection molding screw barrel customization requirements according to machine model, processed material, application, drawings, samples or measured dimensions. Final specifications should be confirmed according to material characteristics, wear condition, plasticizing requirement and order details.

What Can Be Reviewed

  • Screw diameter, barrel dimensions and L/D ratio based on machine model or measured dimensions
  • Screw design review according to processed material, shot requirement and plasticizing condition
  • Material selection based on material abrasiveness, corrosion tendency and working conditions
  • Surface treatment options reviewed according to material and order requirements
  • Custom manufacturing based on machine models, drawings, samples, photos or measured dimensions
  • Quotation review based on machine information, processed material and current production issue

Custom Manufacturing and Machine Matching

Custom manufacturing can be reviewed according to injection molding machine models, drawings, existing components, photos, samples or measured dimensions. If original drawings are unavailable, clear photos, key dimensions and processed-material information can help our engineering team confirm manufacturing feasibility and technical details. For additional engineering support, visit our custom screw design service page.

What Information Do We Need for Quotation?

To support an accurate quotation and technical review for an injection molding screw barrel, please provide the following information when possible:

  • Injection molding machine model or plasticizing unit information
  • Screw diameter, barrel dimensions and L/D ratio if available
  • Processed material, such as PP, PE, ABS, PC, PA, recycled plastic or filled compound
  • Application requirement, such as general molding, engineering plastics, filled materials or recycled materials
  • Current production issue, wear condition or required specification
  • Drawings, samples, measured dimensions or screw barrel photos

Our team will review the information and follow up with pricing, manufacturing feasibility and technical support.

Frequently Asked Questions

What is an injection molding screw barrel used for?
An injection molding screw barrel is used inside the plasticizing unit of an injection molding machine. It helps convey, melt, mix and plasticize plastic material before injection into the mold.
Can you manufacture an injection molding screw barrel according to an existing machine or sample?
Yes. Nanhaiya can manufacture injection molding screw barrels according to machine models, drawings, samples, photos or measured dimensions.
What information is needed for an injection screw barrel quotation?
Please provide the injection molding machine model, screw diameter, barrel dimensions, processed material, application requirement, wear condition and any available drawings, photos, samples or measured dimensions.
Can the screw barrel be customized for engineering plastics or filled materials?
Yes. The screw barrel design, material selection and surface treatment can be reviewed according to the processed material, filler content, wear condition, plasticizing requirement and working conditions.
Do you provide injection molding screw barrels for PP, PE, ABS, PC and PA?
Yes. Injection molding screw barrels can be produced for common plastics and engineering plastics, including PP, PE, ABS, PC, PA and other materials depending on formulation and working conditions.
More technical FAQs (1)
Can you support projects without original drawings?
Yes. If original drawings are unavailable, machine information, photos, samples and measured dimensions can help our engineering team review the required specification and confirm manufacturing feasibility.

Request an Injection Molding Screw Barrel Quote

Send your machine model, processed material, application, drawings, photos or measured dimensions. Nanhaiya can review your injection molding screw barrel requirements and support custom manufacturing, engineering evaluation and quotation.

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