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Precision Screws & Barrels for Injection Molding & Extrusion

GEM Precision Machinery Corp specializes in manufacturing and rebuilding bimetallic barrels, screws, screw tips, and plastification components for injection molding machines and extruders. Trusted by global manufacturers since 2001.

Injection Molding Screw and Barrel

About GEM Precision Machinery Corp

A leader in wear-resistant components for plastic processing machinery, delivering high-performance solutions for injection molding and extrusion applications worldwide.

GEM Precision Factory

Engineered for Performance & Longevity

GEM Technic manufactures screws, barrels, screw tips, end caps, nozzles, tie bars, and other critical components for injection molding machines across various industries. We also produce single screw extrusion systems for extruders and blow molding machines.

Our expertise includes rebuilding worn screws back to OEM specifications and manufacturing new screws based on customer-supplied designs. With fast turnaround times and strict quality control, we ensure minimal downtime for your operations.

  • Specialized in bimetallic and nitrided components
  • PTA welding and advanced hardfacing technologies
  • Custom design and engineering support
  • Global client base with ISO-level quality standards

Our Core Capabilities

Advanced manufacturing and engineering solutions for demanding plastic processing environments.

Precision Machining

CNC milling, turning, deep hole boring, and honing with micron-level accuracy.

Wear Technology

PTA welding, ion/gas nitriding, chrome plating, and Stellite/Colmonoy hardfacing.

Technical Design

Custom screw profiles, barrier screws, mixing zones, and application-specific geometries.

Quality Control

Rigorous inspection protocols, material certification, and dimensional verification.

Our Product Range

High-performance components engineered for durability, efficiency, and consistent output.

Injection Screw

Injection Screws

Custom and standard designs for GP, PVC, thermoset, and engineering resins. Available in nitrided or bimetallic variants.

  • • L/D ratios from 18:1 to 25:1
  • • Base materials: 38CrMoAlA, 4140, H13, D2
  • • Hardfacing: Stellite, Colmonoy, PTA
Injection Barrel

Injection Barrels

Precision-bored and honed barrels with bimetallic liners or nitrided surfaces for extended service life.

  • • Standard and custom diameters
  • • Bimetallic options: Xaloy, Bimetal, CDS
  • • Deep hole boring & honing to ±0.01mm
Screw Tip Assembly

Screw Tip Assembly

Valve tips, mixers, filters, and non-return assemblies for optimal melt control and backflow prevention.

  • • Spring-loaded and check ring designs
  • • Mixing and homogenizing tips
  • • Wear-resistant alloys and coatings
End Cap System

End Cap System

Robust end caps and adapters for secure nozzle attachment and thermal efficiency.

  • • High-strength alloy steel construction
  • • Precision-machined sealing surfaces
  • • Compatible with major machine brands

Nozzles & Tips

Shut-off, open, and valve nozzles with wear-resistant tips for consistent injection performance.

  • • PVD-coated and nitrided options
  • • Custom tip geometries
  • • Leak-proof sealing design

Single Screw & Barrel

Complete extrusion systems for single-screw extruders and blow molding machines.

  • • Designed for recycling, film, and pipe lines
  • • Corrosion and wear-resistant materials
  • • High output and energy efficiency

Tie Bars & Spare Parts

Replacement tie bars, feed throats, and other critical spare parts for injection molding machines.

  • • High-tensile strength steel
  • • Precision-threaded ends
  • • OEM-compatible dimensions

Rebuild & Repair Services

Full restoration of worn screws and barrels to like-new condition with extended lifespan.

  • • Resurfacing, re-cutting, and re-nitriding
  • • PTA rebuild with wear alloys
  • • Fast turnaround and cost savings

Applications

Engineered solutions for the most demanding plastic processing applications.

Engineering Grade Resins

PA, PBT, PET, PC, PPS, and other high-temp engineering plastics requiring wear-resistant components.

Recycled Plastics Material

Abrasive regrind and post-consumer materials demand robust screw and barrel protection.

Flexible & Rigid PVC

Corrosion-resistant materials and precise temperature control for PVC processing.

TPE & LSR

Low-shear, high-homogenization designs for elastomers and liquid silicone rubber.

Bakelite & Thermosets

Short residence time, non-stick surfaces, and precise metering for cross-linking materials.

Powder Injection Molding (PIM)

High wear resistance and consistent feeding for metal and ceramic powder feedstocks.

Blown Film & Pipe Extrusion

High-output single screw systems with superior melt quality and stability.

Fluoropolymers

Special alloys and coatings for processing aggressive fluorinated resins like PTFE.

Structural Foam Molding

Precision gas injection and mixing zones for low-density, high-strength parts.

Our Services

Comprehensive support from design to delivery and beyond.

Repair & Rebuilding

Restore worn screws and barrels to OEM specs with PTA, nitriding, and precision machining.

Design & Engineering

Custom screw profiles, material selection, and process optimization consulting.

Field Service

On-site installation, troubleshooting, and maintenance support worldwide.

Stocking Program

Keep critical spares in stock for rapid replacement and reduced downtime.

MRO Supplies

Genuine replacement parts, wear components, and consumables.

Contract Manufacturing

Precision machining and assembly services for OEMs and integrators.

Get in Touch

For inquiries, technical support, or custom solutions, reach out to our team today.

Location: Meixu, Yinzhou, Ningbo, China

Phone: +86 158 2437 8196

Email: sales@gempmcorp.com

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