ISO 4033 hexagon nut, M20, Article number 40331220. Property class / material: steel class 12, surface finish plain. Hexagon Nut manufactured to ISO 4033 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 | ISO 4033 |
| Property class / grade | CL.12 |
| Class (detailed) | CL.12 |
| Thread type | M |
| Thread diameter | 20 mm |
| Pitch | 2.5 mm |
| Thread pitch class | Coarse |
| Thread direction | Right |
| Threading | Fully Threaded |
| Key width (across flats) | 30 mm |
| Surface treatment | Plain (no plating) |
| Surface treatment code | PLAIN |
| Nut thickness | 20.3 mm |
| Thread standard | ISO metric (M) |
| Article number | 40331220 |
| Category | Nuts / Hexagon Nuts |
| Material | Steel class 12 |
| Primary standard | ISO 4033 |
| Standard size | M20 |
| Thread standard | ISO metric (M) |
| MOQ | 1 |