Ejector Pin Hole: Diameter Tolerance ±0.005 mm

Component Specifications

Definition

An ejector pin hole is a critical feature in precision casting mold cavity inserts, engineered to house ejector pins that facilitate the ejection of solidified castings from the mold. These holes are precisely machined to ensure proper alignment, minimal friction, and reliable operation during the ejection cycle, preventing damage to both the casting and the mold.

Working Principle

The ejector pin hole provides a guided pathway for the ejector pin to move linearly, applying force to the casting to separate it from the mold cavity after solidification. It ensures precise alignment and smooth operation, reducing wear and preventing part deformation.

Materials

Typically made from hardened tool steels (e.g., H13, P20, S7) or carbide for high-wear resistance, with surface treatments like nitriding or chrome plating to enhance durability and reduce friction.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Straightness	0.01 mm per 100 mm
Surface Finish	Ra 0.4 μm or better
Depth Tolerance	±0.01 mm
Perpendicularity	0.01 mm to reference plane
Diameter Tolerance	±0.005 mm

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 8015, DIN 16760

Engineering Analysis

Risks & Mitigation

Misalignment causing pin binding or breakage
Wear leading to increased clearance and ejection issues
Contamination from lubricants or debris affecting operation

FMEA Triads

Trigger: Improper machining tolerances
Failure: Pin jamming or excessive wear
Mitigation: Adhere to strict dimensional controls and regular inspection

Trigger: Inadequate material hardness
Failure: Rapid hole deformation
Mitigation: Use hardened tool steels with appropriate heat treatment

Trigger: Poor lubrication
Failure: Increased friction and overheating
Mitigation: Implement a scheduled maintenance and lubrication protocol

Industrial Ecosystem

Compatible With

Precision casting machines, injection molding machines

Typical Suppliers & Equivalents

DME, HASCO, Misumi, Progressive Components

Compliance & Inspection

Tolerance

Meets ISO 8015 geometric tolerancing standards

Test Method

Coordinate measuring machine (CMM) inspection, go/no-go gauge testing

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

Manufacturers of Ejector Pin Hole

Manufacturer profiles associated with Ejector Pin Hole.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

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Frequently Asked Questions

What is the primary function of an ejector pin hole?

To guide ejector pins for safe and efficient removal of castings from the mold cavity.

Why is surface finish critical for ejector pin holes?

A smooth surface reduces friction and wear, ensuring consistent ejection and extending mold life.

Can ejector pin holes be repaired if worn?

Yes, through processes like sleeving or re-machining, but prevention via proper material selection and maintenance is preferred.

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 Hole