Washer (hardware) - Standard Metric Flat Washers Sizes

Standard Metric Flat Washers Sizes

Washers of standard metric sizes are listed in the table below. Measurements in the table refer to the dimensions of the washers as described by the drawing.

Nominal screw sizes M (mm)		Screw pitch thread P (mm)		Internal (Inside) diameter hole d1 (mm)	External (Outside) diameter d2 (mm)	thickness H (mm)
1st choice	2nd choice	coarse	fine
1		0.25		1.1	3	0.3
1.2		0.25		1.3	3.5	0.3
	1.4	0.3		1.5	4	0.3
1.6		0.35		1.7	4	0.3
	1.7			1.8	4.5	0.3
	1.8	0.35
2		0.4		2.2	5	0.3
2.5		0.45		2.7	6	0.5
	2.6			2.8	7	0.5
3		0.5		3.2	7	0.5
	3.5	0.6		3.7	8	0.5
4		0.7		4.3	9	0.8
5		0.8		5.3	10	1
6		1	0.75	6.4	12	1.6
	7	1		7.4	14	1.6
8		1.25	1	8.4	16	1.6
10		1.5	1.25 or 1	10.5	20	2
12		1.75	1.5 or 1.25	13	24	2.5
	14	2	1.5	15	28	2.5
16		2	1.5	17	30	3
	18	2.5	2 or 1.5	19	34	3
20		2.5	2 or 1.5	21	37	3
	22	2.5	2 or 1.5	23	39	3
24		3	2	25	44	4
	27	3	2	28	50	4
30		3.5	2	31	56	4
	33	3.5	2	34	60	5
36		4	3	37	66	5
	39	4	3	40	72	6
42		4.5	3	43	78	7
	45	4.5	3	46	85	7
48		5	3	50	92	8
	52	5	4	54	98	8
56		5.5	4	58	105	9
	60	5.5	4	62	110	9
64		6	4	66	115	9
	68			70	120	10
72				74	125	10
	76			78	135	10
80				82	140	12
	85			87	145	12
90				93	160	12
	100			104	175	14

Read more about this topic: Washer (hardware)

Famous quotes containing the words standard and/or flat:

“There is a certain standard of grace and beauty which consists in a certain relation between our nature, such as it is, weak or strong, and the thing which pleases us. Whatever is formed according to this standard pleases us, be it house, song, discourse, verse, prose, woman, birds, rivers, trees, room, dress, and so on. Whatever is not made according to this standard displeases those who have good taste.”
—Blaise Pascal (1623–1662)

“They all see you when you least suspect.
Out flat in your p.j.’s glowering at T.V.
or at the oven gassing the cat
or at the Hotel 69 head to knee.”
—Anne Sexton (1928–1974)