Standard--ANSI/ASME B 18.21.2M, DIN 6798 V, IFI 532
Countersunk External-Tooth Lock Washers The teeth firmly grip flat head countersunk screws to prevent joints from loosening under vibration.
| Size | 3 | 3.5 | 4 | 4.5 | 5 | 6 | 8 | ||||
| d | max | 3.4 | 3.9 | 4.5 | 5 | 5.5 | 6.7 | 8.7 | |||
| min | 3.2 | 3.7 | 4.3 | 4.8 | 5.3 | 6.4 | 8.4 | ||||
| dc | 6 | 7 | 8 | 9 | 10 | 12 | 16 | ||||
| h | Nominal Size | 0.4 | 0.4 | 0.4 | 0.5 | 0.5 | 0.5 | 0.6 | |||
| max | 0.43 | 0.43 | 0.43 | 0.535 | 0.535 | 0.535 | 0.64 | ||||
| min | 0.37 | 0.37 | 0.37 | 0.465 | 0.465 | 0.465 | 0.56 | ||||
| Number of Teeth | 8 | 8 | 8 | 9 | 9 | 10 | 12 | ||||