DIN 981 slotted round lock nut, M20 x 1, Article number 981A2020100. Made in stainless steel a2. Slotted Round Lock Nut manufactured to DIN 981 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 981 |
| Property class / grade | A2 |
| Class (detailed) | A2 |
| Thread type | M |
| Thread diameter | 20 mm |
| Pitch | 1 mm |
| Thread pitch class | Fine |
| Thread direction | Right |
| Threading | Fully Threaded |
| Key width (across flats) | 4 mm |
| Key depth | 2 mm |
| Surface treatment | Plain (no plating) |
| Surface treatment code | PLAIN |
| Lock Nut Symbol | KM4 |
| Nut height | 6 mm |
| Nut Inner Diameter | 26 mm |
| Nut Outer Diameter | 32 mm |
| Thread standard | ISO metric (M) |
| Article number | 981A2020100 |
| Category | Nuts / Lock Nuts |
| Material | Stainless A2 |
| Primary standard | DIN 981 |
| Standard size | M20 x 1 |
| Thread standard | ISO metric (M) |
| MOQ | 1 |