BS 4464 Square Spring Washers

Basic dimensions for selected sizes

Size	M4	M5	M6	M8	M10	M12	M16	M20	M22	M24	M30	M36
d1 (min/max)	4.1-4.35	5.1-5.35	6.1-6.4	8.2-8.55	10.2-10.6	12.2-12.6	16.3-16.9	20.3-21.1	22.4-23.3	24.4-25.3	30.5-31.5	36.5-37.6
d2 (max)	6.95	8.55	9.6	12.75	15.9	17.9	24.3	30.5	32.7	35.7	43.9	52.1
s (min/max)	1.1-1.3	1.4-1.6	1.4-1.6	1.9-2.1	2.35-2.65	2.35-2.65	3.3-3.7	4.3-4.7	4.3-4.7	4.8-5.2	5.8-6.2	6.75-7.25