BS 3410 Table 2 Washers

Dimensions for Large Diameter Bright Washers to BS 3410 Table 2

B.A. No.¹	American No. size	Diameter of hole A		Outside diameter B		Thickness² C
		max.	min.	max.	min.	Thickness² C
		Inch.				S.W.G.	Inch.
14	-	0.049	0.044	0.097	0.092	27	0.016
12	-	0.061	0.056	0.130	0.125	27	0.016
10	0	0.078	0.073	0.176	0.171	27	0.016
9	1	0.086	0.081	0.197	0.192	27	0.016
8	2	0.099	0.094	0.228	0.223	25	0.020
7	3	0.111	0.106	0.257	0.252	22	0.028
6	4	0.123	0.118	0.288	0.283	20	0.036
5	5	0.140	0.135	0.335	0.330	20	0.036
4	6	0.157	0.152	0.378	0.373	19	0.040
3	8	0.177	0.172	0.432	0.427	19	0.040
2	10	0.202	0.197	0.500	0.495	18	0.348
1	12	0.228	0.223	0.565	0.560	18	0.048
0	-	0.256	0.251	0.625	0.620	17	0.056

Notes:
1) The sizes shown in bold type are those which are designated "Preferred" in BS 57, " B.A. screws, bolts, nuts and plain washers".
2) Subject to the normal manufacturing tolerances on the sheet or strip as specified in the appropriate British Standards.