Magnetic Parting Lock Sets
Permanent magnet locking eliminates all mechanical wear, generating zero particulate and requiring zero maintenance. The highest-cost parting lock technology — but with the lowest total cost of ownership for high-volume, clean-room, or medical production.
Products (1 Series)
Magnet Lock Sets
Permanent Magnet | Zero Wear | ≤80°C
How Magnetic Locking Works
Permanent Magnet Attraction
Magnetic parting locks embed NdFeB (neodymium-iron-boron) permanent magnets (grade N35-N42) into one mold plate. The opposing plate contains a ferromagnetic steel target. When the mold closes, the magnet and target make contact, generating a holding force proportional to the magnet's remanence and surface area. There is zero physical friction — no sliding, no rolling, no wear. The holding force remains constant over the mold's entire lifetime.
Thermal Limitations
NdFeB magnets have a reversible temperature coefficient of approximately -0.12%/°C. At 80°C, holding force drops ~10% but recovers when cooled. Above 150°C (the irreversible demagnetization temperature for N35 grade), permanent strength loss occurs. For high-temperature applications, SmCo (samarium-cobalt) magnets with 300°C tolerance are available but at significantly higher cost.
Deep dive: For failure mode analysis, see our How Magnetic Parting Locks Eliminate Mechanical Wear in Injection Molds.
ROI: When Magnetic Locks Pay for Themselves
| Cost Factor | Resin Sleeve (Baseline) | Magnetic Lock |
|---|---|---|
| Initial Cost (4 locks) | $200-400 | $800-2,000 |
| Maintenance at 300K cycles | $60-120 + 1 hr downtime | $0 |
| 5-Year TCO (5M cycles) | $1,200-2,400 | $800-2,000 |
| Clean-room Compatible | ✗ (nylon debris) | ✓ |
Is Magnetic Locking Right for You?
✅ Choose magnetic locks when:
- Mold temperature stays below 80°C
- Zero particulate is required (medical, food, semiconductor)
- Maintenance-free operation is the top priority
- Production volume exceeds 2M cycles over the mold's lifetime
🔄 Consider alternatives when:
- Resin Sleeve Locks — mold temperature >80°C or budget is the primary constraint
- Roller Lock Sets — positioning accuracy ±0.02 mm is required (magnets don't provide precision alignment)
- Side Mounting Locks — bidirectional control or external access is needed
Application Scenarios
Medical Device Clean-Room Molding
ISO Class 7-8 clean rooms where any particulate from mold components can contaminate medical devices and fail regulatory audit.
Why it fits: Zero mechanical contact = zero particulate. No lubricants needed. Passes clean-room validation without exemptions for mold hardware.
Food-Contact Packaging Molds
High-speed packaging molds running 24/7 where any unscheduled downtime for lock maintenance directly impacts output and delivery schedules.
Why it fits: Zero maintenance eliminates all scheduled downtime for parting lock servicing. 100% uptime for the locking system over the mold's production life.
Frequently Asked Questions
How strong is the holding force of magnetic parting locks?+
What are the temperature and environmental limitations?+
How long do magnetic parting locks last compared to mechanical locks?+
Do magnetic locks affect sensitive electronics near the mold?+
Engineering Resources
How Magnetic Parting Locks Eliminate Mechanical Wear in Injection Molds
Engineering analysis of permanent magnet locking with wear elimination data.
What Are the Limitations of Magnetic Mold Locks — Temperature, Load, and Environment
Comprehensive guide to operating boundaries and workarounds for magnetic locking.
Need a Custom Quote?
Specify your holding force requirement, operating temperature, and mounting dimensions. Magnet grade and configuration options available for your application.