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.