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Preferred Sizes of Type A Plain Washers [Table 1A] (ASTM A325 / ANSI 1060)

ANSI B 18.22.1 - 1965 (R1998)

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Nominal Diameter

10#

3/16

12#

1/4
N

1/4
W

5/16
N

5/16
W

3/8
N

3/8
W

7/16
N

Nominal Size
Series
d	Nominal Size
	max
	min
d_c	Nominal Size
	max
	min
h	Nominal Size
	max
	min

-	-	-	0.138	0.164	0.190	0.188	0.216	0.250	0.250	0.312	0.312	0.375	0.375	0.438
-	-	-	-	-	-	-	-	N	W	N	W	N	W	N
0.078	0.094	0.125	0.156	0.188	0.219	0.250	0.250	0.281	0.312	0.344	0.375	0.406	0.438	0.469
0.078	0.094	0.133	0.164	0.196	0.227	0.265	0.265	0.296	0.327	0.359	0.390	0.421	0.453	0.484
0.073	0.089	0.120	0.151	0.183	0.214	0.245	0.245	0.276	0.307	0.339	0.370	0.401	0.433	0.464
0.188	0.250	0.312	0.375	0.438	0.500	0.562	0.562	0.625	0.734*	0.688	0.875	0.812	1.000	0.922
0.188	0.250	0.320	0.390	0.453	0.515	0.577	0.577	0.640	0.749	0.703	0.905	0.827	1.030	0.937
0.183	0.245	0.307	0.370	0.433	0.495	0.557	0.557	0.620	0.727	0.681	0.868	0.805	0.993	0.915
0.020	0.020	0.032	0.049	0.049	0.049	0.049	0.065	0.065	0.065	0.065	0.083	0.065	0.083	0.065
0.025	0.025	0.040	0.065	0.065	0.065	0.065	0.080	0.080	0.080	0.080	0.104	0.080	0.104	0.080
0.016	0.016	0.025	0.036	0.036	0.036	0.036	0.051	0.051	0.051	0.051	0.064	0.051	0.064	0.051

Nominal Diameter

7/16
W

1/2
N

1/2
W

9/16
N

9/16
W

5/8
N

5/8
W

3/4
N

3/4
W

7/8
N

7/8
W

1
N

1
W

1-1/8
N

1-1/8
W

Nominal Size
Series
d	Nominal Size
	max
	min
d_c	Nominal Size
	max
	min
h	Nominal Size
	max
	min

0.438	0.500	0.500	0.562	0.562	0.625	0.625	0.750	0.750	0.875	0.875	1.000	1.000	1.125	1.125
W	N	W	N	W	N	W	N	W	N	W	N	W	N	W
0.500	0.531	0.562	0.594	0.625	0.656	0.688	0.812	0.812	0.938	0.938	1.062	1.062	1.250	1.250
0.515	0.546	0.577	0.609	0.640	0.686	0.718	0.842	0.842	0.968	0.968	1.092	1.092	1.280	1.280
0.495	0.526	0.557	0.589	0.620	0.649	0.681	0.805	0.805	0.931	0.931	1.055	1.055	1.243	1.243
1.250	1.062	1.375	1.156*	1.469*	1.312	1.750	1.469*	2.000	1.750	2.250	2.000	2.500	2.250	2.750
1.280	1.092	1.405	1.186	1.499	1.342	1.780	1.499	2.030	1.780	2.280	2.030	2.530	2.280	2.780
1.243	1.055	1.368	1.149	1.462	1.305	1.743	1.462	1.993	1.743	2.243	1.993	2.493	2.243	2.743
0.083	0.095	0.109	0.095	0.109	0.095	0.134	0.134	0.148	0.134	0.165	0.134	0.165	0.134	0.165
0.104	0.121	0.132	0.121	0.132	0.121	0.160	0.160	0.177	0.160	0.192	0.160	0.192	0.160	0.192
0.064	0.074	0.086	0.074	0.086	0.074	0.108	0.108	0.122	0.108	0.136	0.108	0.136	0.108	0.136

Nominal Diameter

1-1/4
N

1-1/4
W

1-3/8
N

1-3/8
W

1-1/2
N

1-1/2
W

1-5/8

1-3/4

1-7/8

2-1/4

2-1/2

2-3/4

Nominal Size
Series
d	Nominal Size
	max
	min
d_c	Nominal Size
	max
	min
h	Nominal Size
	max
	min

1.250	1.250	1.375	1.375	1.500	1.500	1.625	1.750	1.875	2.000	2.250	2.500	2.750	3.000
N	W	N	W	N	W	-	-	-	-	-	-	-	-
1.375	1.375	1.500	1.500	1.625	1.625	1.750	1.875	2.000	2.125	2.375	2.625	2.875	3.125
1.405	1.405	1.530	1.545	1.655	1.670	1.795	1.920	2.045	2.170	2.420	2.670	2.940	3.190
1.368	1.368	1.493	1.490	1.618	1.615	1.740	1.865	1.990	2.115	2.365	2.615	2.865	3.115
2.500	3.000	2.750	3.250	3.000	3.500	3.750	4.000	4.250	4.500	4.750	5.000	5.250	5.500
2.530	3.030	2.780	3.295	3.030	3.545	3.795	4.045	4.295	4.545	4.795	5.045	5.315	5.565
2.493	2.993	2.743	3.240	2.993	3.490	3.740	3.990	4.240	4.490	4.740	4.990	5.240	5.490
0.165	0.165	0.165	0.180	0.165	0.180	0.180	0.180	0.180	0.180	0.220	0.238	0.259	0.284
0.192	0.192	0.192	0.213	0.192	0.213	0.213	0.213	0.213	0.213	0.248	0.280	0.310	0.327
0.136	0.136	0.136	0.153	0.136	0.153	0.153	0.153	0.153	0.153	0.193	0.210	0.228	0.249

①,Preferred size are for the most part from series previously designated "Standard Plate" and "SAE." Where common sizes existed in the two series, the SAE size is designated "N" (narrow) and the Standard Plate "W" (wide). These sizes as well as all other sizes of Type A Plain Washers are to be ordered by ID, OD and thickness dimensions.
②,The 0.734 in., 1.156 in., and 1.469 in. outside diameters avoid washers which could be used in coin operated devices.

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Similar Standards

1	[DIN] DIN 125-1 - 1990	Product Grade A, up to Hardness 250 HV, Primarily for Hexagon Bolts and Nuts View Suppliers
2	[ASME/ANSI] ASME/ANSI B 18.21.1 - 2009	Plain Washers - Type B (ASTM F844)
3	[ISO] ISO 7091 - 1983	Plain Washers- Producte Grade C
4	[ASME] ASME B 18.21.1 - 2009 (R2016)	Plain Washers - Type B (ASTM F844)
5	[ANSI] ANSI B 18.22.1 - 1965 (R1998)	Additional Selected Sizes of Type A Plain Washers [Table 1B] (ASTM A325 / ANSI 1060)
6	[DIN] DIN 126 - 1990	Product Grade C Washers Designed for use with Hexagon Head Bolts and Nuts
7	[ISO] ISO 887 - 2000 (R2006)	Plain Washers for Metric Bolts, Screws and Nuts for General Purposes
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