100% Customization per Drawing

Sprue Bushings & Gates

Precision sprue bushings, pinpoint gate bushings and runner components in SKD61, H13, M2/P21 and carbide — bolt-fixing and shoulder types, ISO 10072 / HASCO / DME / MISUMI interchange, precision-ground bores Ra 0.02, ±0.002 mm on critical seats, 3–7 day delivery.

Bolt-fixing and shoulder sprue bushings, 8–20 mm flange thickness
Pinpoint gate bushings in steel and carbide for three-plate molds
M2/P21 extension bushings, runner lock pins & rolling gate-cut units
ISO 10072 / HASCO / DME / MISUMI interchangeable dimensions
Precision-ground, mirror-polished bores (Ra 0.02–0.4) with PVD coating options
MOQ 1 piece — standard 3–7 days, custom 7–10 days, 24–72h express

Download CAD / Specs

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

Technical Specifications

Sprue Bushings & Gates Technical Parameters & Material Specs

Standard Materials

SKD61 / H13 / M2 / P21 / Carbide

High thermal fatigue & wear resistance for abrasive resins

Bushing Types

Bolt-Fixing & Shoulder Types

8–20 mm flange thickness, ISO 10072 / HASCO / DME / MISUMI

Precision Tolerance

±0.002 – ±0.005 mm

Critical nozzle seat & bore diameters jig-ground

Surface Finish

Ra 0.02 – Ra 0.4 µm

Mirror-polished bore for clean sprue release

Parameter	Technical Details / Standard Values
Sprue Bore / Orifice (O) Range	Ø 4.0 – Ø 9.0 mm standard orifice sizes (custom bore per CAD, reamed & polished)
Nozzle Seat Radius (SR)	SR 12.5 / 15.5 / 20 mm — Type A spherical seat matched to machine nozzle
Internal Taper (Included Angle)	Standard 2.39° (½ in/ft); custom 1° – 2.5° for reduced sprue mass & cycle time
Head / Flange Dimensions	Head Ø 20 – Ø 64 mm, flange thickness 8 – 20 mm, shoulder & bolt-fixing styles
Gate & Runner Component Types	Pinpoint gate bushings, M2/P21 extension bushings, runner lock pins, rolling gate-cut units
Surface Coating Options	Nitriding, TiN, TiAlN, DLC, CrN — for glass-filled and abrasive resins

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

APPLICATION & INDUSTRY SOLUTIONS

High-Performance Sprue Bushings & Gate Systems for Mold Applications

🚗 Automotive

Automotive Connectors & Interior Molds

Multi-cavity PA66+GF connector molds with carbide pin-point gates and hard-lock runner pins that survive abrasive glass-filled resins, PPAP-ready.

🔌 Electronics

3C Electronics & Thin-Wall Housings

Pin-point gates down to Ø 1.2 mm tips for near-invisible gate vestige on ABS/PC cosmetic surfaces; rolling gate-cut units trim in-mold.

🩺 Medical

Medical Device & High-Cavity Molds

Flow-rate adjustment pins balance multi-cavity filling for syringes and device housings, with clean gate separation and zero flash.

📦 Packaging

High-Cycle Packaging & Closure Molds

Cooling-circuit sprue bushings cut cycle time on caps and containers running millions of shots per year, eliminating sprue sticking.

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.

CUSTOM MACHINING CAPABILITIES

Tailored Sprue Bushings & Gate Components 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 sprue bushings 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 sprue bushings 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).

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 Sprue Bushings & Gates & 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 sprue bushings?

We support 1-piece prototyping! Whether you need a single replacement sprue bushings 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 sprue bushings 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 sprue bushings 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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