| Content: | 
| Typical values for allowable surface pressures for different materials Based on VDI 2230  | 
        
| Surface pressure under the head of a hexagon screw according to DIN 931/933 (ISO 4014/4017) with coarse thread  | 
        
| Surface pressure under the head of a socket head cap screw according to DIN 912 (ISO 4762/14759) and coarse thread  | 
        
| Surface pressure under the screw head | 
| Guide to the use of flat washers for screws and nuts according to ISO 887  |