100% Customization per Drawing

Core Pins

Precision core pins for injection molds — straight, stepped and taperless types, high-wear steel grades, ±0.002 mm positional accuracy, standard and custom diameters with fast turnaround.

Straight, stepped and taperless core pin types
High-wear grades with optional coating
±0.002 mm positional accuracy from jig grinding
Interchange dimensions to international standards
Custom diameters and lengths per drawing
MOQ 1 piece with 3–7 day standard lead time

Download CAD / Specs

Fast Response within 2 HoursSupport STEP, IGES, DWG, PDF Files

Technical Specifications

Core Pins Technical Parameters & Material Specs

Standard Materials

SKD61 / H13 / SKH51 / Carbide

High thermal fatigue & wear resistance

Precision Tolerance

±0.002 mm – ±0.005 mm

Jig grinding & CNC precision ground

Surface Roughness

Ra 0.1 – Ra 0.4 µm

Optional mirror polishing available

Hardness Range

HRC 48–52 / HRC 58–62

Nitrided surface treatment supported

Parameter	Technical Details / Standard Values
Outer Diameter (OD) Range	Ø 0.5 mm – Ø 32.0 mm (custom sizes per CAD drawing)
Overall Length (L)	Up to 500 mm (custom length supported)
Concentricity / Coaxiality	≤ 0.003 mm
Perpendicularity	≤ 0.005 mm
Surface Coating Options	TiN, TiAlN, DLC, CrN, Nitriding
Applicable Mold Types	Precision injection molds, die casting molds, medical & automotive components

Need a non-standard size or special alloy core pin? We specialize in 100% custom machining according to your 2D/3D CAD drawings.

CUSTOM MACHINING CAPABILITIES

Tailored Core Pins Machining & Special Processing Limits

📏 Dimensional Limits

Micro & Complex Dimensions

Outer Diameter (OD): Min Ø 0.2 mm to Max Ø 50.0 mm
Pin Length: Up to 600 mm (ultra-long core pins supported)
Special Shapes: Stepped, tapered, flat D-cut, square head & eccentric pin tip

⚙️ Special Processes

Cooling & Deep Hole EDM

Cooling Channels: Internal water cooling holes & spiral baffle channels
Air Venting: Porous / vented core pins structures for gas release
Micro-EDM: Complex cavity contours, thread inserts and micro-grooves

🛡️ Surface Treatments

Advanced PVD Coatings

TiN / TiAlN: High-heat resistance for die casting molds
DLC (Diamond-Like Carbon): Ultra-low friction for dry / cleanroom molding
Nitriding Treatment: HV 900–1100 surface hardness for extended mold life

Support 100% Customization According to Your Drawings

Send us your CAD files for a free DFM (Design for Manufacturability) analysis and instant quotation.

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QUALITY ASSURANCE & INSPECTION

Rigorous Precision Inspection & Quality Control Standards

🔬 Inspection Hardware

High-Precision Testing Equipment

ZEISS CMM for complex 3D contours
Nikon optical projector & tool presetters (0.001 mm resolution)
Vickers hardness testers & surface roughness gauge

🎯 Quality Standards

Zero-Defect Quality Assurance

100% critical dimension inspection before packaging & shipment
Concentricity & runout verification under optical magnifiers
Surface micro-scratch & polish quality double-check

📜 Material Compliance

Full Material & Heat Treatment Traceability

Spectrometer material composition analysis report provided
Original Mill Test Certificate (MTC) & heat treatment logs
RoHS & REACH environmental compliance statements

Download Sample Quality Control & Inspection Reports

Review our standard CMM inspection sheet, Material Composition Certificate, and RoHS report templates.

MANUFACTURING PROCESS & LEAD TIME

Precision Machining Workflow & Reliable Delivery Timelines

Turning / Soft CNC

Precision rough turning & blank shaping

Heat Treatment

Vacuum quenching (HRC 48–62)

Rough Grinding

Centerless & OD precision grinding

Finish Grinding / EDM

Jig grinding & micro-EDM features

Surface Coating

PVD (TiN/DLC) or polishing (Ra 0.1)

100% CMM QC

Dimension check & safe packaging

📦 Standard Delivery

3–5 Working Days

For standard dimensions, off-the-shelf standard blanks, and standard SKD61/H13 materials.

🛠️ Custom Manufacturing

7–10 Working Days

For tailored CAD drawings, complex cooling channels, special coatings, or tight ±0.002 mm tolerances.

⚡ Fast-Track Option

24–72 Hours Express

Emergency mold repair green channel available for urgent downtime orders (upon CAD review).

APPLICATION & INDUSTRY SOLUTIONS

High-Performance Core Pins for Demanding Mold Applications

🚗 Automotive

Automotive Plastic & Die Casting Molds

Engineered for high thermal fatigue resistance in engine housings, structural die castings, and auto lighting connectors.

🩺 Medical Cleanroom

Medical & Precision Cleanroom Molds

Mirror-polished (Ra 0.1) core pins with DLC coating for oil-free, biocompatible injection molding of syringes and micro-fluidic parts.

🔌 Electronics

3C Electronics & Micro-Connectors

Ultra-small diameter core pins (down to Ø 0.2 mm) with ±0.002 mm accuracy for high-density electronic pin header molds.

📦 Thin-Wall Packaging

Thin-Wall & High-Speed Packaging Molds

High-hardness SKH51/Carbide pins designed for multi-cavity, ultra-high-cycle caps, closures, and container molding.

Key Mold Performance Challenges We Resolve:

Heat Fatigue & Thermal Cracking

Vacuum-quenched H13/SKD61 steel prevents thermal erosion in aluminum & zinc die casting.

High Wear & Galling Resistance

Advanced PVD coatings (TiAlN / DLC) extend pin service life by 3x–5x in abrasive glass-filled resins.

Mold Pin Bending & Flash Issues

Strict coaxiality (≤0.003 mm) and rigid alloy cores eliminate flash and core deflection during high-pressure injection.

MANUFACTURING CAPABILITY & DETAIL GALLERY

Precision Craftsmanship & Advanced Factory Hardware

Mirror Finish & Micro Polish

Ra 0.1 µm surface roughness, zero micro-burr or tool marks on pin tip.

Precision Chamfering & R-Angle

Smooth transition radii and precise lead-in chamfers per CAD specs.

PVD Coating & Nitriding Layers

Uniform TiAlN / DLC coating film thickness with high surface adhesion.

Complex Head & Tip Geometries

Precision stepped, D-cut flat, and eccentrically shaped pin profiles.

High-End Machining & Tooling Hardware:

⚡ Wire EDM

Seibu & Sodick Slow-Feed Wire Cut

Corner radius accuracy down to R0.02 mm
Surface roughness Ra 0.2 µm after wire cutting
Suitable for micro-slots, keyways, and complex pin contours

⚙️ Precision Grinding

Mitsui & WASINO Precision Grinders

Centerless & jig grinding for tight OD/length limits
Diameter tolerance controlled within ±0.001–±0.002 mm
Coaxiality & roundness ≤ 0.002 mm guaranteed

🛠️ CNC & EDM

Mikron High-Speed CNC & Sodick EDM

CNC high-speed turning & milling for blank preparation
Micro-cavity EDM for cooling channels and venting slots
Automated tool changers for high-volume consistency

ORDERING PROCESS & FREQUENTLY ASKED QUESTIONS

How to Order Custom Core Pins & Frequently Asked Questions

📁 Step 1

Submit CAD & Specs

Send 2D/3D drawings (STEP, DWG, PDF) with quantity, material, and tolerance requirements.

⏱️ Step 2

24H DFM & Quotation

Our engineering team conducts DFM analysis and provides a competitive quote within 24 hours.

⚙️ Step 3

Precision Manufacturing

CNC turning, vacuum heat treatment, jig grinding, and surface coating per your specifications.

✈️ Step 4

100% QC & Express Shipping

100% CMM dimensional verification, anti-rust packaging, and global air express delivery.

What is your Minimum Order Quantity (MOQ) for custom core pins?

We support 1-piece prototyping! Whether you need a single replacement core pins or bulk batch production of 10,000+ pieces, we accommodate all order volumes.

How do you guarantee material authenticity and heat treatment quality?

Every batch comes with original Mill Test Certificates (MTC) and spectral material analysis reports. Vacuum heat treatment logs (HRC hardness testing) are provided upon request.

What packaging and anti-rust protection do you apply for international shipping?

All finished core pins undergo ultrasonic cleaning, immersion in heavy-duty anti-rust oil, individual vacuum plastic sealing, and padded shockproof box packaging.

Can you machine non-standard custom shapes or internal cooling channels?

Yes! We specialize in complex core pins including stepped profiles, D-cuts, square heads, micro-EDM cavities, and internal/spiral water cooling channels per CAD specs.

Ready to Upgrade Your Mold Component Precision?

Send us your drawing today to receive a free DFM review and detailed quotation within 24 hours.

🔒 100% Confidential | NDA Protected | Instant DFM Assessment

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