5Pcs Ring Magnets 40×6mm Black | Strong Round Ferrite Magnets for Crafts, DIY, Speaker, Motor, Science Projects BD

Product Description:

This set of 5 black ring magnets (40 mm outer diameter × 6 mm thickness) is made from ferrite material, offering high magnetic strength and durability. Perfect for DIY electronics, loudspeakers, motors, educational kits, magnetic tools, or creative crafting. Their non-coated black surface resists demagnetization, making them a versatile and affordable solution for a wide range of household and industrial applications.

⚙️ Specifications:

Parameter Details

Product Type Ring Magnet (Donut Shape)

Outer Diameter 40 mm

Inner Hole Diameter Approx. 20–25 mm (varies by batch)

Thickness 6 mm

Material Ferrite (Ceramic)

Color Black (Uncoated)

Magnetization Axial (flat face N–S poles)

Temperature Range –40 °C to +250 °C

Quantity in Pack 5 Pieces

Key Features:

✅ Strong Ferrite Ring Magnets – 40mm diameter, 6mm thick

✅ Ideal for Speakers, Motors, and Magnetic Tools

✅ Black Ceramic Finish – Rust-resistant and long-lasting

✅ Multi-use: DIY crafts, school science projects, generators

✅ Cost-effective pack of 5 pieces

✅ Reusable & high-temperature resistant

Applications:

Loudspeakers & microphone coil systems

Electric motor & wind turbine DIY

Magnetic therapy and educational science models

Fridge magnets, magnetic locks, and catches

Home and industrial magnetic tools and projects

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• Product Type Ring Magnet (Donut Shape)
• Outer Diameter 40 mm
• Inner Hole Diameter Approx. 20–25 mm (varies by batch)
• Thickness 6 mm
• Material Ferrite (Ceramic)
• Color Black (Uncoated)
• Magnetization Axial (flat face N–S poles)
• Temperature Range –40 °C to +250 °C
• Quantity in Pack 5 Pieces