Hexagon socket countersunk head screws DIN7991, zink
| Manufacturer | BOSSARD |
| Type of mounting element | screw |
| Kind of head | countersunk |
| Kind of cut | hex key |
| DIN standard | DIN 7991 |
| ISO standard | ISO 10642 |
| Material | steel |
| Plating material | zinc |
| Strength class | 10.9 |
| BN standard | BN 21 |
| Symbol | Thread | Length | Head diameter | Head height | Cut size |
|---|---|---|---|---|---|
| [mm] | [mm] | [mm] | [mm] | ||
| B3X8/BN21 | M3 | 8 | 6 | 1.7 | HEX 2 |
| B3X12/BN21 | M3 | 12 | 6 | 1.7 | HEX 2 |
| B4X8/BN21 | M4 | 8 | 8 | 2.3 | HEX 2.5 |
| B4X10/BN21 | M4 | 10 | 8 | 2.3 | HEX 2.5 |
| B4X12/BN21 | M4 | 12 | 8 | 2.3 | HEX 2.5 |
| B4X16/BN21 | M4 | 16 | 8 | 2.3 | HEX 2.5 |
| B4X30/BN21 | M4 | 30 | 8 | 2.3 | HEX 2.5 |
