Strontium Ferrite Ring Magnet 20 x 5 x 10 mm with Countersunk Hole for Screw Mounting
The strontium ferrite (SrFe) magnet offers an economical, robust solution where resistance to moisture, corrosion and temperature is more important than maximum strength for a given size. Unlike neodymium, ferrite does not require a protective coating and can be used at temperatures up to 250 °C, although its magnetic strength is lower for the same volume. The ring shape is useful for mounting centred on a shaft or screw and for technical assemblies where positioning is important. The countersunk design for screw mounting suits the application's specific installation requirements.
The The 20 x 10 x 5 mm size suits mounting on a shaft, screw or magnetic spacer and simplifies centring. Allows more secure mechanical installation. Suitable for outdoor use, damp environments, high-temperature applications and uses where low cost and operating stability are important.
Warning: The material is ceramic and brittle. Impacts or excessive clamping pressure can cause the magnet to chip or break. This is not a toy. Keep away from children and electronic equipment and devices sensitive to magnetic fields.
Strontium Ferrite Ring Magnet 20 x 5 x 10 mm Countersunk
| Shape | Ring |
| Size | 20 x 5 x 10 mm |
| Outer diameter | 20 mm |
| Inner diameter | 5 mm |
| Height | 10 mm |
| Material | Strontium ferrite (SrFe12O19 / SrFe) |
| Magnetic grade | Y35 |
| Surface protection | Uncoated |
| Dimensional tolerance | Dext 0,4 mm / Dint 0,2 mm / h 0,1 mm |
| Approx. weight | 5,71 g |
| Holding force | approx. 0,71 kg (6,97 N) |
| Maximum operating temperature | 250 °C |
| Curie temperature | 450 °C |
| Magnetisation direction | Axial |
| Remanence Br | 0,40 - 0,41 T (4000 - 4100 G) |
| Coercivity bHc | 175 - 195 kA/m (2,20 - 2,45 kOe) |
| Intrinsic coercivity iHc | 180 - 200 kA/m (2,26 - 2,51 kOe) |
| Maximum energy product BHmax | 30,0 - 32,0 kJ/m³ (3,8 - 4,0 MGOe) |
| Corrosion resistance | Very good |
| Design | Countersunk, screw-mounted |
| Fastening | Mechanical fastening / installation into a structure |
| Note | Brittle material; avoid excessive clamping |
