Dimensions of ASME B18.21.1 Countersunk External Tooth Lock Washers

Nominal Washers Size	Inside Diameter, A		Outside Diameter, B, Reference	Thickness, C		Length, D
	Max	Min		Max	Min	Max	Min
4	0.123	0.113	0.213	0.019	0.015	0.065	0.050
6	0.150	0.140	0.289	0.021	0.017	0.092	0.082
8	0.177	0.167	0.322	0.021	0.017	0.099	0.083
10	0.205	0.195	0.354	0.025	0.020	0.105	0.088
12	0.231	0.220	0.421	0.025	0.020	0.128	0.118
1/4	0.267	0.255	0.454	0.025	0.020	0.128	0.113
16	0.287	0.273	0.505	0.028	0.023	0.147	0.137
5/16	0.333	0.318	0.599	0.028	0.023	0.192	0.165
3/8	0.398	0.383	0.765	0.034	0.028	0.255	0.242
7/16	0.463	0.448	0.867	0.045	0.037	0.270	0.260
1/2	0.529	0.512	0.976	0.045	0.037	0.304	0.294

Notes : Dimensions are in inches.

• Suggested angle or mating components is 80-82 deg.
• Washers size are intended for use with comparable nominal screw sizes.
• For reference purposes only; not subject to inspection.