INDUSTRY COMPONENT

Ejector Pins

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

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
ParameterTypical rangeNotes & selection driver
LengthCustomized to die design
Diameter3-20 mm (standard range)
Toleranceh6 or tighter
Head TypesShoulder, straight, stepped
Surface FinishRa ≤ 0.4 μm

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 9181, DIN 1530

Parent Products

This component is used in the following industrial products

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

Typical Suppliers & Equivalents

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

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
Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Ejector Pins

1 company lists this product among what they make. Company figures are quoted from each company's own website; every card states where the relationship came from.

Dobeter Electronics (Suzhou) Co., Ltd.
Suzhou, Jiangsu, CN
Listed on the company's own website · profile compiled by CNFX from public sources

Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

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Main Frame
The main frame is the primary structural component of a hydraulic press, providing rigidity and stability to withstand high compressive forces during metal forming operations.

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.

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.

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