DIN 439-B hexagon nut (form B), M42 x 3, left-hand thread, Article number 439L42300. Property class / material: steel class 4, surface finish plain. Hexagon Nut manufactured to DIN 439 with ISO metric (M) thread, fine 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 439 |
| Standard description | B |
| Property class / grade | CL.04 |
| Class (detailed) | CL.04 |
| Thread type | M |
| Thread diameter | 42 mm |
| Pitch | 3 mm |
| Thread pitch class | Fine |
| Thread direction | Left |
| Threading | Fully Threaded |
| Surface treatment | Plain (no plating) |
| Surface treatment code | PLAIN |
| Nut thickness | 21 mm |
| Width across flats | 65 mm |
| Thread standard | ISO metric (M) |
| Article number | 439L42300 |
| Category | Nuts / Hexagon Thin Nuts |
| Material | Steel class 4 |
| Primary standard | DIN 439 |
| Standard size | M42 x 3 |
| Thread standard | ISO metric (M) |
| MOQ | 1 |