DIN 557 square nut, M8, Article number 557A408. Made in stainless steel a4. Square Nut manufactured to DIN 557 with ISO metric (M) thread, coarse pitch, fully 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 557 |
| Property class / grade | A4 |
| Class (detailed) | A4 |
| Thread type | M |
| Thread diameter | 8 mm |
| Pitch | 1.25 mm |
| Thread pitch class | Coarse |
| Thread direction | Right |
| Threading | Fully Threaded |
| Key width (across flats) | 13 mm |
| Surface treatment | Plain (no plating) |
| Surface treatment code | PLAIN |
| Nut Diameter | 18.4 mm |
| Nut height | 6.5 mm |
| Thread standard | ISO metric (M) |
| Article number | 557A408 |
| Category | Nuts |
| Material | Stainless A4 |
| Primary standard | DIN 557 |
| Standard size | M8 |
| Thread standard | ISO metric (M) |
| MOQ | 1 |