SKU 8670 is an unmagnetized N35 neodymium ring blank measuring 4 mm OD × 1 mm ID × 4 mm long, with silver plating. It is supplied without magnetization. You will need a suitable magnetizer before using it as a working permanent magnet; this part is intended for processes that include a magnetization step.
Specifications and supplied condition
| Magnet Size: |
OD 4 mm × ID 1 mm × T 4 mm |
| Tolerances: |
±0.004" |
| Material: |
Rare Earth NdFeB |
| Grade: |
N35 |
| Coating: |
Silver plated |
| Br (typical): |
12,100 Gauss |
| BHmax (typical): |
35 MGOe |
| Max Temperature: |
80°C / 176°F |
| Magnetization: |
Unmagnetized; axial when magnetized |
| Pull Force when magnetized: |
1.87 lb |
| Approx. Weight: |
0.0125 oz |
Planning the magnetization and assembly process
The listed axial orientation describes the intended condition after magnetization, with the poles on the annular end faces. The listed 1.87 lb pull force applies when magnetized, not to the blank as supplied. Confirm the required field direction, magnetizing equipment and acceptance checks for your process before ordering production quantities.
Check the 1 mm center opening and dimensional tolerance against any locating feature or shaft. Provide clearance and support the brittle ring rather than forcing it into an interference fit. Protect the silver-plated surface from scratches during handling, and validate contact materials and environmental exposure for the intended assembly.
After magnetization, test performance with the actual target, working gap and loading direction. Listed pull force is a comparison value rather than a safe working load. The listed 80°C maximum is a material reference; evaluate the completed magnetic circuit and other assembly materials at the operating temperature.
Compare material grades using our neodymium grades chart. Read about field orientation in our ring magnetization guide, compare stock ring sizes, or specify your magnetization process and quantities in the Magnet RFQ Builder.
