Hexalobular (6 Lobe) socket adjusting screws friction thread and cutting ribs under the head
BN 20923
| Headform | 
            Headform
            Countersunk with cutting ribs
 | 
| Drive | 
            Drive
            Hexalobular socket
 | 
| Material | 
            Material
            Steel
 | 
| Surface | 
            Surface
            zinc plated blue
 | 
All features
Features
| Headform | 
            Headform
            Countersunk with cutting ribs
 | 
| Drive | 
            Drive
            Hexalobular socket
 | 
| Material | 
            Material
            Steel
 | 
| Surface | 
            Surface
            zinc plated blue
 |