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(Non-preferred) dimensions in parentheses.

Double Coil Helical Spring Lock Washers - Type D

BS 4464 - 1969

Display drawing:

For thread diameter

(M2.2)

M2.5

(M3.5)

M10

M12

(M14)

M16

d	max
d	min
s	Nominal Size
	max
	min
d_c	max
b	Nominal Size
	max
	min
H	≈5s

2.4	2.6	2.9	3.6	4.1	4.6	5.6	6.6	8.8	10.8	12.8	15	17
2.1	2.3	2.6	3.3	3.8	4.3	5.3	6.3	8.4	10.4	12.4	14.5	16.5
0.5	0.6	0.7	0.8	0.8	0.8	0.9	1	1.2	1.2	1.6	1.6	2
0.55	0.65	0.8	0.9	0.9	0.9	1	1.1	1.3	1.3	1.7	1.7	2.1
0.45	0.55	0.6	0.7	0.7	0.7	0.8	0.9	1.1	1.1	1.5	1.5	1.9
4.4	4.8	5.5	6.2	7.5	8	9.8	12.9	15.1	18.2	20.2	25.4	27.4
0.9	1.0	1.2	1.2	1.6	1.6	2	3	3	3.5	3.5	5	5
1.0	1.1	1.3	1.3	1.7	1.7	2.1	3.15	3.15	3.7	3.7	5.2	5.2
0.8	0.9	1.1	1.1	1.5	1.5	1.9	2.85	2.85	3.3	3.3	4.8	4.8
2.5	3	3.5	4	4	4	4.5	5	6	6	8	8	10

For thread diameter

(M18)

M20

(M22)

M24

(M27)

M30

(M33)

M36

(M39)

M42

M48

M56

M64

d	max
d	min
s	Nominal Size
	max
	min
d_c	max
b	Nominal Size
	max
	min
H	≈5s

19	21.5	23.5	26	29.5	33	36	40	43	46	52	60	70
18.5	20.8	22.8	25	28	31.5	34.5	38	41	44	50	58	67
2	2	2.5	3.25	3.25	3.25	3.25	3.25	3.25	4.5	4.5	4.5	4.5
2.1	2.1	2.35	3.4	3.4	3.4	3.4	3.4	3.4	4.7	4.7	4.7	4.7
1.9	1.9	2.35	3.1	3.1	3.1	3.1	3.1	3.1	4.3	4.3	4.3	4.3
29.4	31.9	35.9	39.4	44	49.5	52.5	60.5	63.5	66.5	72.5	84.5	94.5
5	5	6	6.5	7	8	8	10	10	10	10	12	12
5.2	5.2	6.2	6.7	7.25	8.25	8.25	10.25	10.25	10.25	10.25	12.25	12.25
4.8	4.8	5.8	6.3	6.75	7.75	7.75	9.75	9.75	9.75	9.75	11.75	11.75
10	10	12.5	16.25	16.25	16.25	16.25	16.25	16.25	22.5	22.5	22.5	22.5

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