Ejector Pin: Diameter Range 1mm to 25mm, Hardness 50-60 HRC

Component Specifications

Definition

Ejector pins are cylindrical rods used in the ejection system of injection molding machines to physically separate solidified plastic parts from mold cavities. They operate through hydraulic or mechanical force applied by the ejector plate assembly, ensuring consistent part release without damage to the mold or product. These components are critical for automated production cycles and require precise alignment with mold ejector holes.

Working Principle

Ejector pins function by transferring linear force from the ejector plate to the molded part. When the injection molding cycle completes and the mold opens, the machine's ejection system activates, pushing the ejector plate forward. This motion drives the pins against the part, overcoming adhesion forces between the plastic and mold surface. The pins retract when the mold closes for the next cycle, maintaining clearance during injection and cooling phases.

Materials

Typically made from hardened tool steels like H13, D2, or M2 for wear resistance. High-temperature applications may use stainless steel (e.g., 420SS) or carbide-tipped variants. Surface treatments like nitriding or titanium coating enhance durability.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Hardness	50-60 HRC
Straightness	0.01mm per 100mm
Diameter Range	1mm to 25mm
Surface Finish	Ra 0.2μm max
Length Tolerance	±0.02mm

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 9001, DIN 1530

Parent Products

This component is used in the following industrial products

Ejection System

A mechanism within injection molds that pushes finished plastic parts out of the mold cavity after cooling and solidification.

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Ejector System

A mechanical system within a die set that removes formed parts from the die cavity after the molding or stamping process.

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Engineering Analysis

Risks & Mitigation

Pin breakage due to misalignment
Part surface marks from pin contact
Reduced ejection efficiency from wear

FMEA Triads

Trigger: Improper pin alignment during installation
Failure: Pin binds or breaks, halting production
Mitigation: Use alignment tools and verify pin fit before operation

Trigger: Insufficient lubrication
Failure: Increased friction leads to premature wear
Mitigation: Apply high-temperature lubricant regularly and monitor wear patterns

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

ISO 2768-m for general dimensions, with critical fits to ISO 286 H7/g6

Test Method

Dimensional inspection via CMM, hardness testing per ASTM E18, and wear testing under simulated cycles

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 Ejector Pin

Manufacturer profiles associated with Ejector Pin.

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Frequently Asked Questions

What causes ejector pin wear?

Wear results from friction against mold surfaces, thermal cycling, and material abrasion from reinforced plastics. Regular lubrication and proper alignment reduce wear.

How do I select ejector pin diameter?

Choose based on part size and ejection force needed; larger diameters (e.g., 5mm+) prevent bending in high-stress applications, while smaller pins (1-3mm) suit delicate parts.

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.

Ejector Pin