The Ferrite Ring Magnet 55mm OD × 25mm ID × 12mm is a ceramic ferrite ring magnet with 55mm outer diameter, 25mm inner diameter, and 12mm thickness, offering excellent corrosion resistance and axial or radial magnetization for DIY and robotics builds. These ferrite ring magnets are the larger variant compared to the 37mm ring covered separately — with 49% greater outer diameter and 33% more thickness, this ring contains significantly more magnetic material, generating a proportionally stronger magnetic field through its larger body for more demanding applications.
The circular ferrite magnets 25mm inner diameter defines the voice coil diameter in DIY speaker builds — this larger bore suits mid-range speaker drivers and small woofers where a wider voice coil assembly is needed compared to the smaller 19mm bore of the 37mm variant. This large ferrite ring magnet’s 12mm thickness also provides a deeper axial field reach through the voice coil gap, improving magnetic coupling between the ring and the pole piece in speaker motor assemblies. The 55mm OD is also large enough to pass a substantial bolt or shaft through the center for magnetic rotor and coupling applications.
One practical trade-off: this ferrite magnet 55mm is heavier and bulkier than the smaller 37mm ring — builders need to account for the larger mounting footprint and weight in enclosure and chassis designs. Available from StemVolt, offering quality robotics parts and DIY kits at competitive prices. This ferrite ring magnet is ideal for DIY projects, robotics applications and STEM models.
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Features:
- 55mm OD ferrite ring in lineup for stronger field builds
- 25mm ID suits mid-range speaker and woofer voice coil diameters
- 12mm thickness gives deeper axial field for speaker gap coupling
- Excellent corrosion resistance — no coating required for ceramic ferrite
- Axial or radial magnetization suits speaker, motor, and rotor builds
Technical Specifications:
Applications:
- Ferrite Ring used for DIY mid-range speaker driver motor assembly
- College project uses ferrite ring magnets for large speaker field demo
- Motor project uses large ferrite ring magnet for magnetic rotor coupling
- Ferrite magnet 55mm for large ring field experiment
Package Includes:
- 1 × Ferrite Ring Magnet
Puja Chakraborty –
Best purchase for my final year project.
Kartik Rane –
Quick shipping and the magnet arrived intact without any issues.
Piyush Birla –
Used this ring magnet in a DIY engineering project. The dimensions were accurate, magnetic strength was consistent, and expert guidance from the support team helped me choose the right magnet for my application.
Maulik Choksi –
Original product received exactly as shown on the website.