| Type of spacer | washer |
| Kind of washer | round |
| DIN standard | DIN 125A |
| ISO standard | ISO 7089 |
| Manufacturer | BOSSARD |
| Material | brass |
| Plating material | nickel |
| BN standard | BN 561 |
| Symbol | Thread | Internal diameter | Outside diameter | Height |
|---|---|---|---|---|
| [mm] | [mm] | [mm] | ||
| B2.5/BN561 | M2,5 | 2.5 | 6 | 0.5 |
| B4/BN561 | M4 | 4.3 | 9 | 0.8 |
| B5/BN561 | M5 | 5.3 | 10 | 1 |