Mold Springs
Heat-resistant mold springs for injection mold ejection and stripper plate return — ISO 10243 color-coded coil springs (SWF–SWY, 30–65% deflection grades), SiCr alloy wire rated to 200°C, plus gate cut springs and SGAMK spring guide pins, MOQ 1, 3–7 day delivery.
- ISO 10243 interchangeable coil springs, SWF–SWY color-coded load grades
- Heat-resistant SiCr alloy wire (JIS G3561 SWOSC-V), continuous service to 200°C
- Round and flat wire types with 30–65% rated deflection grades
- Gate cut springs for automated runner stripper plates and SGAMK spring guide pins
- Springs sized in 24h DFM review to actual ejector stroke and force
- MOQ 1 piece, 3–7 day standard delivery, custom dimensions supported
Fast Response within 2 HoursSupport STEP, IGES, DWG, PDF Files
Technical Specifications
Mold Springs Technical Parameters & Material Specs
Standard Material
SiCr Alloy Wire (JIS G3561 SWOSC-V)
Oil-tempered, heat-resistant to 200°C continuous
Load Grades
SWF – SWY, 6 color-coded grades
ISO 10243: Yellow → Brown / flat wire
Max Deflection
30% – 65% by load grade
Round wire 35–60%, flat wire 60–65%
Operating Temperature
Up to 200°C continuous
< 5% load loss over 1 million cycles
| Parameter | Technical Details / Standard Values |
|---|---|
| Diameter (OD) Range | Ø 6 mm – Ø 63 mm (ISO 10243 standard series; custom sizes per CAD drawing) |
| Free Length (L) | 25 mm – 152 mm standard lengths (custom lengths supported) |
| Compression Ratio / Max Deflection | 20% – 65% by grade — SWF 60% / SWL 50% / SWM 40% / SWH 35% / SWU 60% / SWY 65% |
| Material & Wire Type | Oil-tempered SiCr alloy steel, round & flat wire; chrome silicon per ISO 10243 |
| Precision & Tolerance | Spring rate ±10% (ISO 10243); length/diameter machining to ±0.005 mm, critical ±0.002 mm |
| Surface Finish | E-coat / powder coating, shot-peened & preset; color-coded per load grade |
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 Mold Springs 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 mold springs 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 mold springs 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.
QUALITY ASSURANCE & INSPECTION
Rigorous Precision Inspection & Quality Control Standards
🔬 Inspection HardwareHigh-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 StandardsZero-Defect Quality Assurance
- 100% critical dimension inspection before packaging & shipment
- Concentricity & runout verification under optical magnifiers
- Surface micro-scratch & polish quality double-check
📜 Material ComplianceFull 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 Mold Springs for Demanding Mold Applications
🚗 Automotive
Automotive Connector & Deep-Draw Molds
SWH/SWU heavy and super-heavy springs for connector housings, sensor bodies and deep-draw panels where return force is critical, PPAP-ready.
🩺 Medical
Medical & Cleanroom Molds
Heat-resistant springs for high-cycle syringe and micro-fluidic tooling running continuous 24/7 operation without load sag.
🔌 Electronics
3C Electronics & Micro-Connectors
SWF/SWL light-grade springs for small-cavity ejector return in high-density pin header and connector molds.
📦 Packaging
Thin-Wall & High-Speed Packaging Molds
Gate cut springs for automated runner stripper plates and flat-wire springs for ultra-high-cycle caps and closures.
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 Mold Springs & 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 mold springs?
We support 1-piece prototyping! Whether you need a single replacement mold springs 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 mold springs 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 mold springs 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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