Shot Sleeve: Diameter 40-120 mm, Length 500-2000 mm

Component Specifications

Definition

The shot sleeve is a critical component in plastic injection molding systems, serving as the conduit through which molten plastic material is transferred from the hopper to the injection unit. It is typically a cylindrical tube made from high-grade steel, designed to withstand high temperatures and pressures while maintaining precise dimensional stability. The shot sleeve ensures consistent material flow and prevents contamination during the injection process.

Working Principle

The shot sleeve operates by receiving molten plastic from the hopper and guiding it through the injection system. As the injection screw rotates and moves forward, it pushes the molten material through the shot sleeve into the mold cavity. The sleeve's smooth interior surface minimizes friction and ensures uniform flow, while its thermal properties help maintain the material at optimal processing temperature.

Materials

Typically made from high-grade tool steel (such as H13 or P20), often hardened and chrome-plated for wear resistance and corrosion protection. Some applications use bimetallic linings for enhanced durability.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Length	500-2000 mm
Diameter	40-120 mm
Wall Thickness	10-30 mm
Pressure Rating	150-250 MPa
Surface Hardness	45-55 HRC
Operating Temperature	200-350°C

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 294, DIN 16742

Parent Products

This component is used in the following industrial products

Injection System

Component responsible for injecting molten metal into the die cavity under high pressure

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Engineering Analysis

Risks & Mitigation

Material degradation due to overheating
Wear and scoring from abrasive materials
Corrosion from certain plastic additives
Thermal stress cracking

FMEA Triads

Trigger: Inadequate temperature control
Failure: Material sticking or degradation
Mitigation: Implement precise temperature monitoring and control systems

Trigger: Abrasive plastic compounds
Failure: Premature wear and scoring
Mitigation: Use hardened or coated sleeves and implement regular inspection schedules

Trigger: Improper alignment
Failure: Uneven material flow and pressure variations
Mitigation: Ensure proper installation and periodic alignment checks

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±0.05 mm diameter, ±0.1 mm straightness

Test Method

Dimensional inspection with micrometers, surface roughness testing, pressure testing at 1.5x operating pressure

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

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Manufacturers of Shot Sleeve

Manufacturer profiles associated with Shot Sleeve.

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Frequently Asked Questions

What is the primary function of a shot sleeve?

The shot sleeve transfers molten plastic from the hopper to the injection unit while maintaining material temperature and ensuring consistent flow into the mold cavity.

How often should shot sleeves be inspected?

Shot sleeves should be inspected every 6-12 months for wear, scoring, or corrosion, with more frequent checks in high-volume production environments.

Can shot sleeves be repaired if damaged?

Minor surface damage can often be polished out, but significant wear or scoring typically requires replacement to maintain injection quality.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Shot Sleeve