Industry-Verified Manufacturing Data (2026)

Precision Casting Mold Ejector Pin

Based on aggregated insights from multiple verified factory profiles within the CNFX directory, the standard Precision Casting Mold Ejector Pin used in the Foundries sector typically supports operational capacities ranging from standard industrial configurations to heavy-duty production requirements.

Technical Definition & Core Assembly

A canonical Precision Casting Mold Ejector Pin is characterized by the integration of Pin Shaft and Head. In industrial production environments, manufacturers listed on CNFX commonly emphasize H13 Tool Steel construction to support stable, high-cycle operation across diverse manufacturing scenarios.

Metal pin that ejects castings from molds in foundry operations

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Product Specifications

Technical details and manufacturing context for Precision Casting Mold Ejector Pin

Definition
A precision-engineered cylindrical component used in metal casting molds to forcibly eject solidified castings from mold cavities. These pins are critical for automated foundry production lines, ensuring consistent part release without damage to delicate castings. They withstand extreme thermal cycling and mechanical stress during repeated casting cycles. Proper ejector pin design prevents casting defects and maintains dimensional accuracy in high-volume manufacturing.
Working Principle
Hydraulic or mechanical force pushes the pin through the mold, contacting the casting surface to dislodge it from the cavity after solidification
Common Materials
H13 Tool Steel, SKD61 Alloy Steel, Tungsten Carbide
Technical Parameters
  • Pin diameter tolerance for precise mold fit (mm) Standard Spec
  • Surface hardness for wear resistance (HRC) Standard Spec
Components / BOM
  • Pin Shaft
    Main cylindrical body that contacts casting
    Material: Tool steel or alloy steel
  • Head
    Retention feature that prevents pin from falling through mold
    Material: Same as shaft material
  • Tip
    Contact surface that interfaces with casting
    Material: Hardened steel or carbide
  • Cooling Channel Optional
    Internal passage for coolant circulation
    Material: Integrated into shaft
Engineering Reasoning
150-450°C mold temperature, 20-80 MPa ejection force
650°C thermal softening threshold for H13 tool steel, 1200 MPa ultimate tensile strength limit
Design Rationale: Thermal fatigue from cyclic heating (450°C) and cooling (150°C) during casting cycles, causing crack initiation at stress concentrations
Risk Mitigation (FMEA)
Trigger Mold misalignment exceeding 0.05 mm tolerance
Mode: Pin bending deflection >1.5 mm causing binding
Strategy: Precision ground alignment surfaces with 0.01 mm flatness tolerance and hardened guide bushings
Trigger Insufficient lubricant film thickness <5 μm at 450°C
Mode: Gallowing and adhesive wear at pin-mold interface
Strategy: Molybdenum disulfide coating with 15 μm thickness and automated lubrication system with 0.1 mL/cycle minimum

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Precision Casting Mold Ejector Pin.

mold ejector pin die casting ejector casting knockout pin foundry ejector rod H13 tool steel ejector pin for casting molds tungsten carbide mold ejector pin foundry precision casting mold ejector pin specifications SKD61 alloy steel ejector pin BOM foundry mold ejector pin surface hardness HRC

Industrial Ecosystem & Supply Chain DNA

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: Up to 150 MPa (ejection force), 50 MPa (mold clamping)
other spec: Max ejection stroke: 300 mm, Surface finish: Ra 0.4 μm, Wear resistance: >100k cycles (typical)
temperature: Ambient to 1200°C (continuous), 1400°C (peak)
Media Compatibility
✓ Steel alloys (e.g., H13, P20) ✓ Aluminum alloys (e.g., A356, 380) ✓ Copper-based alloys (e.g., brass, bronze)
Unsuitable: Highly corrosive molten metals (e.g., magnesium alloys without protective atmosphere)
Sizing Data Required
  • Mold cavity dimensions (diameter/depth)
  • Required ejection force (based on casting material and geometry)
  • Mold plate thickness and available stroke length

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Thermal fatigue cracking
Cause: Repeated thermal cycling during casting cycles causes expansion/contraction stresses, leading to micro-cracks that propagate through the pin material, especially at stress concentration points like grooves or diameter changes.
Abrasive wear and galling
Cause: Friction between the pin and mold guide bushings during ejection, combined with residual casting material (slag or oxide particles) acting as abrasives, leading to material loss, increased clearance, and eventual seizing.
Maintenance Indicators
  • Visible scoring or galling marks on the pin surface, indicating excessive wear or material transfer.
  • Audible sticking or grinding noise during ejection, suggesting misalignment, insufficient lubrication, or debris accumulation.
Engineering Tips
  • Implement a controlled cooling protocol post-ejection to minimize thermal shock, and use pins made from high-temperature alloys with enhanced thermal fatigue resistance.
  • Apply a specialized high-temperature, anti-galling coating (e.g., DLC or ceramic) and maintain strict alignment and lubrication schedules to reduce abrasive wear.

Compliance & Manufacturing Standards

Reference Standards
ISO 9001:2015 Quality Management Systems ASTM A681 Standard Specification for Tool Steels Alloy DIN 17350 Steel for Heat Treatment
Manufacturing Precision
  • Diameter: +/-0.01mm
  • Surface Roughness: Ra 0.4μm
Quality Inspection
  • Hardness Test (HRC 45-50)
  • Dimensional Verification with CMM

Factories Producing Precision Casting Mold Ejector Pin

Verified manufacturers with capability to produce this product in China

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✓ 92% Supplier Capability Match Found

T Technical Director from United States Feb 19, 2026
★★★★★
"The technical documentation for this Precision Casting Mold Ejector Pin is very thorough, especially regarding Pin Diameter (mm)."
Technical Specifications Verified
P Project Engineer from United Arab Emirates Feb 16, 2026
★★★★☆
"Reliable performance in harsh Foundries environments. No issues with the Precision Casting Mold Ejector Pin so far. (Delivery took slightly longer than expected, but technical support was excellent.)"
Technical Specifications Verified
S Sourcing Manager from Australia Feb 13, 2026
★★★★★
"Testing the Precision Casting Mold Ejector Pin now; the Pin Diameter (mm) results are within 1% of the laboratory datasheet."
Technical Specifications Verified
Verification Protocol

“Feedback is collected from verified sourcing managers during RFQ (Request for Quote) and factory evaluation processes on CNFX. These reports represent historical performance data and technical audit summaries from our B2B manufacturing network.”

19 sourcing managers are analyzing this specification now. Last inquiry for Precision Casting Mold Ejector Pin from Poland (1h ago).

Frequently Asked Questions

What materials are used for precision casting mold ejector pins?

Our ejector pins are made from H13 Tool Steel, SKD61 Alloy Steel, or Tungsten Carbide, chosen for their durability, heat resistance, and wear properties in foundry environments.

What are the key specifications to consider when selecting an ejector pin?

Key specs include pin diameter and length, straightness tolerance, surface finish (Ra), surface hardness (HRC), and thermal conductivity to ensure proper ejection and longevity in casting molds.

What is the BOM (Bill of Materials) for a typical ejector pin?

A standard ejector pin consists of a cooling channel, head, pin shaft, and tip, designed to efficiently eject castings while withstanding high temperatures and mechanical stress.

Can I contact factories directly on CNFX?

CNFX is an open directory, not a transaction platform. Each factory profile provides direct contact information and production details to help you initiate direct inquiries with Chinese suppliers.

Data Specifications verified by CNFX Industrial Index (v2.6.03) for Foundries sector.

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