DIN 931 hexagon head screw, M20 x 55, Article number 9311020055. Property class / material: steel 10.9, surface finish plain. Hexagon Head Screw manufactured to DIN 931 with ISO metric (M) thread, coarse pitch, partially threaded. Standard parts to the same standard, property class, dimensions and surface finish are interchangeable between manufacturers; confirm the controlling standard revision, any class-society or application approval, and the mating thread before substitution.
| Standard | DIN 931 |
| Type | Hexagon Head Screw |
| Property class / grade | 10.9 |
| Class (detailed) | 10.9 |
| Thread type | M |
| Thread diameter | 20 mm |
| Pitch | 2.5 mm |
| Thread pitch class | Coarse |
| Thread direction | Right |
| Length | 55 mm |
| Thread length | 46 mm |
| Threading | Partially Threaded |
| Fully threaded | No |
| Head type | Hexagon Head |
| Drive type | Hex Drive |
| Key width (across flats) | 30 mm |
| Head height | 12.5 mm |
| Surface treatment | Plain (no plating) |
| Surface treatment code | PLAIN |
| Length | 55 mm |
| Thread standard | ISO metric (M) |
| Article number | 9311020055 |
| Category | Bolts and Screws / Hexagon Head Screws |
| Material | Steel 10.9 |
| Primary standard | DIN 931 |
| Standard size | M20 x 55 |
| Thread standard | ISO metric (M) |
| MOQ | 1 |