100% Customization per Drawing

Ejector Sleeves & Center Pins

Precision ejector sleeves and center pins in SKD61, SKH51 and M2 — straight and stepped series, H7 bore / g6 OD tolerances, ≤0.015 mm concentricity, JIS B5009 / DIN 16756 / DME / MISUMI compatible, MOQ 1, 3–7 day lead time.

Thin-Wall Ejection — hollow sleeves release tubes, bottles and deep-drawn parts around the core without piercing or marking
Straight & Stepped Series — stepped OD sleeves for deep-boss and long-stroke ejection (150 mm+ strokes)
Matched Sleeve + Center Pin Sets — ground together with verified concentricity, CMM reported per pair
JIS B5009 / DIN 16756 compatible, with DME and MISUMI head and bore dimensions for drop-in replacement
SKD61, SKH51 and M2 steel grades — 48–64 HRC, nitriding and PVD coatings for abrasive resins
MOQ 1 piece — standard 3–7 days, custom 7–10 days, urgent 24–72 h

Download CAD / Specs

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

Technical Specifications

Ejector Sleeves & Center Pins Technical Parameters & Material Specs

Standard Materials

SKD61 / SKH51 / M2

48–64 HRC — vacuum hardened, nitriding available

Bore & OD Tolerance

ID H7 / OD g6

Straight & stepped series, matched sets

Concentricity

≤ 0.010 – 0.015 mm

Straight & stepped series, factory-aligned sets

Surface Finish

Ra 0.1 µm bore / Ra 0.4 µm OD

Mark-free ejection on thin walls

Parameter	Technical Details / Standard Values
Outer Diameter (OD)	g6 tolerance (-0.005 / -0.020 mm); custom diameters per CAD drawing
Inner Diameter (Bore)	H7 tolerance (+0.015 / 0 mm); ground bore, Ra 0.1 µm
Concentricity / Coaxiality	≤ 0.015 mm straight series; ≤ 0.010 mm stepped series
Length & Ejection Stroke	Up to 150 mm+ ejection stroke (stepped sleeve-pin sets)
Steel Grades & Hardness	SKD61 48–52 HRC (nitrided 900+ HV), SKH51 58–61 HRC, M2 61–64 HRC
Standards & Compatibility	JIS B5009 / DIN 16756, DME & MISUMI compatible; TiN / CrN / nitriding coatings

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 Ejector Sleeves & Center 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 ejector sleeves & center 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 ejector sleeves & center 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.

.STEP.IGES.DWG.DXF.PDF

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 Ejector Sleeves & Center Pins for Demanding Mold Applications

🚗 Automotive

Automotive Connector & Housing Molds

Stepped sleeve-pin sets hold concentricity over 150 mm+ strokes while nitrided SKD61 resists abrasion from glass-filled PA66 and PC/ABS compounds.

🔌 Electronics

Electrical Connector & 3C Molds

Two-step center pins provide delayed, dual-stage release for multi-cavity connector molds, preventing core damage on thin pins.

🩺 Medical Cleanroom

Medical & Precision Cleanroom Molds

Through-hardened SKH51 sleeves with mirror-ground bores deliver clean, gall-free ejection for syringes and micro-fluidic parts.

📦 Thin-Wall Packaging

Thin-Wall Packaging & Bottle Molds

Straight sleeves eject tubes, bottles and deep cups around the core — uniform 360° force with no pierce marks on thin walls.

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 Ejector Sleeves & Center 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 ejector sleeves & center pins?

We support 1-piece prototyping! Whether you need a single replacement ejector sleeves & center 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 ejector sleeves & center 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 ejector sleeves & center 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

Related Mold Components