Stavax Core & Ejector Pins for Plastic Injection Molds
Stavax core pins and ejector pins are precision mold components used in plastic injection molds where corrosion resistance, surface stability, and consistent ejection performance are required. Stavax® is a premium stainless mold steel (commonly in the S136 / 1.2083 stainless class) known for its ability to maintain clean surfaces and resist rust in humid environments or molds that require frequent cleaning.
We manufacture custom Stavax core pins, core pin assemblies, ejector pins, stepped ejectors, and pin sets according to customer drawings. These pins often involve long, slender geometries and tight tolerance requirements—especially at forming tips, sealing lands, and guiding diameters—so we focus on controlled machining, straightness management, and reliable inspection.
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Product Description
Core pins and ejector pins may look similar, but they perform different functions inside an injection mold:
Core Pins (Forming Pins)
Core pins form internal features of the molded part—such as holes, bores, thin channels, and precision inner details. They must maintain accurate geometry and surface quality to avoid molding defects and ensure repeatable part dimensions.
Ejector Pins (Ejection Pins)
Ejector pins push the molded part off the core side after cooling. Their performance affects cycle stability, part deformation risk, and cosmetic marking. Proper pin fit and surface finish help prevent sticking, galling, and abnormal wear.
Why Stavax for Pins
Stavax is specified when pin surfaces must stay clean and stable over long runs, especially in environments where corrosion or surface oxidation can cause sticking or surface defects. Typical reasons include:
- Strong corrosion resistance compared with non-stainless tool steels
- Good surface stability for consistent ejection behavior
- Reliable heat-treatment response to achieve practical working hardness
- Good finishing capability for functional pin surfaces
Pins are functional parts—final design, hardness, and finishing must match the mold's ejection system, resin, and production conditions. We manufacture to your drawings and requirements.
Applications
Stavax core and ejector pins are used in plastic injection molds for:
- Forming internal details with core pins
- Stable, repeatable ejection with ejector pins
- Pin sets for multi-cavity molds requiring consistency
- Replacement pins for mold maintenance and refurbishment
- Molds operating in humid environments or requiring frequent cleaning, where stainless pins reduce rust-related issues
Precision & Manufacturing Capabilities
Pin-type components are sensitive to straightness, runout, and tip accuracy. We manufacture pins with processes and controls designed for slender precision parts.
Manufacturing Processes
- Precision CNC turning and micro-feature machining
- Grinding for diameters, guide sections, and critical fits
- Tip forming for stepped, tapered, or profile features
- Heat treatment coordination (per specified hardness)
- Surface finishing / polishing for sliding and contact surfaces
Typical Controls for Core & Ejector Pins
- Straightness control for long pins to reduce binding and uneven ejection
- Diameter tolerance and fit control (guide section vs. bushing/plate)
- Concentricity/runout control for stepped designs
- Surface finish management to reduce galling and sticking
- Tip geometry verification to minimize cosmetic marking and part damage
Inspection & Documentation
- Dimensional inspection reports available upon request
- Material certificates and heat treatment records (upon request)
- Part marking/traceability options for pin set management
Customer Value
- More stable ejection, fewer production interruptions – Accurate pin fits and smooth surfaces reduce sticking, uneven ejection, and cycle instability.
- Lower risk of rust-related defects – Stavax stainless performance helps prevent corrosion that can cause pin seizure, surface marks, or unexpected maintenance.
- Reduced wear and better repeatability – Proper hardness and finish help minimize galling and extend pin service life—especially for high-cycle molds.
- Consistent results for multi-cavity molds – Matched pin sets with controlled variation help maintain cavity-to-cavity consistency and predictable performance.
What We Need for Quotation
To quote Stavax core & ejector pins accurately, please provide:
- 3D CAD (STEP/IGES) and/or 2D drawing (PDF/DWG)
- Pin type: core pin, ejector pin, stepped ejector, sleeve ejector (if applicable)
- Material requirement: Stavax (confirm accepted equivalents if any)
- Target hardness and heat treatment specification
- Critical tolerances (diameters, straightness, runout, tip dimensions)
- Surface finish requirement (especially for sliding/guide sections)
- Quantity (single pieces or matched sets) and lead time
- Inspection/document needs (FAI, CMM report format, traceability)
If you're replacing existing pins, sharing the mating hole/bushing dimensions helps ensure correct fit.
Frequently Asked Questions
Are you a manufacturer or trading company?
We are a custom precision mold components manufacturer, producing parts with CNC machining, grinding, EDM (when needed), and finishing.
Do you manufacture strictly to drawings and tolerances?
Yes. We produce to your drawings, GD&T, and datum references. If tolerances are not specified, we can propose a practical tolerance plan for approval.
Can you provide inspection reports and material certificates?
Yes. Inspection reports and material/heat treatment certificates are available upon request.
Pins-Specific Questions
What's the difference between a core pin and an ejector pin?
A core pin forms part geometry (internal features). An ejector pin pushes the molded part out after cooling. They require different tip geometry, fit, and surface finish considerations.
Why do pins often stick or wear quickly?
Common causes include poor straightness, incorrect fit clearance, rough surface finish, inadequate hardness, or corrosion/oxidation on pin surfaces. Stainless pin materials and controlled finishing can reduce these risks.
Can you supply matched pin sets for multi-cavity molds?
Yes. We can manufacture pin sets with controlled dimensional variation and provide inspection data for key sizes.
Send your drawings and specify critical pin fits (guide diameter, clearance, straightness, tip geometry). We'll review manufacturability and provide a production plan for Stavax core and ejector pins optimized for stable mold performance.
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