Nord-Lock wedge-locking washer pair NL-20. Pair of two washers with cams on outside (mate to fastener) and radial teeth on inside faces (grip mating surfa. Used in general machinery assembly, structural steelwork and pressure-boundary flanged joints per DIN, ISO and ASME B18 dimensional standards.
| Thread | M20 |
| Material | Steel zinc-flake |
| Dimensions (ID×OD×T) | 20.7×37.0×4.5 mm |
| Standard | DIN 25201 / Junker DIN 65151 tested |
| Finish | Zinc-flake Delta-Protekt |
| Pack | Pair (2 washers = 1 unit) |
| Usable with | DIN 912 / DIN 933 / ISO 4014 hex-head + socket-head bolts |
| Material | Steel zinc-flake |
| Primary standard | DIN 25201 |
| Thread standard | M20 |
| MOQ | 1 |
Install with cam faces against each other (marked side out). Do not reuse after removal. Pair up-sizes bolt-head contact area — verify counterbore clearance.