INDUSTRY COMPONENT

Ejector Pins

Ejector pins are precision components in die casting dies that push solidified castings out of the mold cavity after injection.

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Component Specifications

Definition
Ejector pins are cylindrical rods installed in the ejector plate assembly of a die casting die. They contact the casting surface at designated points and apply mechanical force to separate the solidified part from the mold cavity during the ejection phase of the casting cycle. Their precise positioning and smooth operation are critical for part quality and cycle efficiency.
Working Principle
Ejector pins operate through hydraulic or mechanical actuation of the ejector plate. When the die opens after casting solidification, the ejector plate moves forward, pushing the pins against the casting. The pins transfer force to eject the part from the cavity, then retract as the die closes for the next cycle.
Materials
Typically made from high-grade tool steels like H13 (AISI), SKD61 (JIS), or 1.2344 (DIN) with hardness of 45-52 HRC. Surface treatments like nitriding or TiN coating may be applied for wear resistance.
Technical Parameters
  • Length Customized to die design
  • Diameter 3-20 mm (standard range)
  • Tolerance h6 or tighter
  • Head Types Shoulder, straight, stepped
  • Surface Finish Ra ≤ 0.4 μm
Standards
ISO 9181, DIN 1530

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Ejector Pins.

ejector pins die casting components mold ejection tool steel pins casting ejection system industrial tooling Ejector Pins in Machinery and Equipment Manufacturing

Parent Products

This component is used in the following industrial products

Die Casting Die

A precision tool used in high-pressure die casting to shape molten metal into complex components.

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Ejection Mechanism

A mechanical system that removes solidified castings from the die cavity after the high-pressure die casting process.

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Moving Die Half (Ejector Die)

The movable half of a die casting die that contains ejector mechanisms to remove castings

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Engineering Analysis

Risks & Mitigation
  • Pin breakage due to fatigue
  • Sticking from inadequate lubrication
  • Part marking from pin impressions
  • Misalignment causing ejection failure
FMEA Triads
Trigger: Thermal stress and cyclic loading
Failure: Pin fracture during ejection
Mitigation: Use fatigue-resistant materials, optimize pin diameter, implement predictive maintenance
Trigger: Lubrication breakdown
Failure: Pin seizure or scoring
Mitigation: Apply high-temperature lubricants, schedule regular maintenance, monitor ejection force

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
Diameter tolerance per ISO 286 h6, straightness ≤ 0.02 mm/100 mm
Test Method
Dimensional inspection with micrometers, hardness testing (Rockwell C), and surface roughness measurement

Buyer Feedback

★★★★☆ 4.9 / 5.0 (8 reviews)

"Reliable performance in harsh Machinery and Equipment Manufacturing environments. No issues with the Ejector Pins so far."

"Testing the Ejector Pins now; the technical reliability results are within 1% of the laboratory datasheet."

"Impressive build quality. Especially the technical reliability is very stable during long-term operation."

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Frequently Asked Questions

What causes ejector pin wear in die casting?

Wear results from thermal cycling, abrasive aluminum or zinc alloys, misalignment, insufficient lubrication, or material fatigue at high temperatures (200-400°C).

How are ejector pins maintained?

Regular inspection for scoring or bending, proper lubrication with high-temperature grease, alignment checks, and timely replacement of worn pins prevent downtime.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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Ejector Pin Hole Ejector Plate