BS 3410 Table 1 Washers

Dimensions for Small Diameter Bright Washers to BS 3410 Table 1

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.
8	2	0.099	0.094	0.185	0.180	25	0.020
7	3	0.111	0.106	0.208	0.203	24	0.022
6	4	0.123	0.118	0.233	0.228	23	0.024
5	5	0.140	0.135	0.268	0.263	23	0.024
4	6	0.157	0.152	0.301	0.296	22	0.028
3	8	0.177	0.172	0.341	0.336	22	0.028
2	10	0.202	0.197	0.391	0.386	21	0.032
1	12	0.228	0.223	0.443	0.438	20	0.036
0	-	0.256	0.251	0.500	0.495	19	0.040

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.