Metric External Tooth Lockwashers
Metric External Tooth Lockwasher
DIN 6797 A;
JIS B 1255
Nominal Size A B C Preferred Number of Teeth*
Inside Diameter Outside Diameter Thickness
Max Min Max Min Max Min
M3 3.4 3.2 6.5 6.1 0.485 0.415 8
M3.5 3.9 3.7 7.5 7.1 0.485 0.415 8
M4 4.5 4.3 8.5 8.1 0.485 0.415 9
M5 5.5 5.3 10 9.6 0.64 0.56 10
M6 6.7 6.4 11 10.5 0.64 0.56 12
M8 8.7 8.4 15 14.5 0.85 0.75 12
M10 10.9 10.5 18 17.5 0.95 0.85 12
M12 12.9 12.5 21 20.4 1.055 0.945 12
M14 14.9 14.5 23 22.4 1.055 0.945 12
M16 16.9 16.5 26 25.4 1.265 1.135 14
M20 21.5 21 32 31.2 1.47 1.33 14
* Slight deviation from the preferred number of teeth is permitted.