Technical data for Flat washers according to British norm

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This product is regulated by the following standards:

Standard BS 4320

Metal washers for general engineering purposes. Metric series

BS 4320 Relates to bright metal and black metal washers for use with ISO metric bolts, screws and nuts. The washers are basically divided into 3 categories of size: 'normal', 'large' and 'extra large' diameter series and the bright washers are further divided by including a 'light range' which have thicknesses approximately 60 per cent of the 'normal range' thicknesses. The bright metal washers cover the range for bolts, M1 to M39, and the black metal washers cover the range M5 to M68.

Dimensions in mm - source BS 4320
Publication date: 05/1968
Thread size	Type	d min	d1 max	s nom	~Weight (7.85 Kg dm3) Kg/1000 Pcs
M 1	A	1.1	2.5	0.3
M 1.2	A	1.3	3	0.3
M 1.4	A	1.5	3	0.3
M 1.6	A	1.7	4	0.3
M 2	A	2.2	5	0.3
M 2.2	A	2.4	5	0.5
M 2.5	A	2.7	6.5	0.5
M 3	A	3.2	7	0.5	0.119
M 3.5	A	3.7	7	0.5
M 4	A	4.3	9	0.8	0.308
	B
	C	4.3	10	0.8	0.40
M 4.5	A	4.8	9	0.8
M 5	A	5.3	10	1	0.443
	B	5.3	10	0.8	0.36
	C	5.3	12.5	1	0.79
	D
	E	5.5	10	1	0.43
	F
	G	5.5	15	1.6	1.92
M 6	A	6.4	12.5	1.6	1.02
	B	6.4	12.5	0.8	0.57
	C	6.4	14	1.6	1.53
	D	6.4	14	0.8	0.77
	E	6.6	12.5	1.6	1.11
	F
	G	6.6	18	2	3.46
M 7	A	7.4	14	1.6
	B	7.4	14	0.8
	C
	D
	E
	F
	G
M 8
	B
	C
	D
	E
	F
	G
M 10
	B
	C
	D
	E
	F
	G
M 12
	B
	C
	D
	E
	F
	G
M 14
	B
	C
	D
	E
	F
	G
M 16
	B
	C
	D
	E
	F
	G
M 18
	B
	C
	D
	E
	F
	G
M 20
	B
	C
	D
	E
	F
	G
M 22
	B
	C
	D
	E
	F
	G
M 24
	B
	C
	D
	E
	F
	G
M 27
	B
	C
	D
	E
	F
	G
M 30
	B
	C
	D
	E
	F
	G
M 33
	B
	C
	D
	E
	F
	G
M 36
	B
	C
	D
	E
	F
	G
M 39
	B
	C
	D
	E
	F
	G
M 42
	B
	C
	D
	E
	F
	G
M 45
M 48
	B
	C
	D
	E
	F
	G
M 52
M 56
	B
	C
	D
	E
	F
	G
M 60
M 64
	B
	C
	D
	E
	F
	G
M 68

The definitive version for the implementation of this standard is the edition bearing the most recent date of issue, obtainable from BSI -The British Standards Institution, 389 Chiswick High Road, London, W4 4AL, UK.
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Technical data for Flat washers according to British norm

This product is regulated by the following standards:

Standard BS 4320

Flat washers according to British norm

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