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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 EN ISO] DIN EN ISO 7091 - 2000	Plain washers - Normal series, Product grade C
2	[ASME/ANSI] ASME/ANSI B 18.21.1 - 2009	Plain Washers - Type A (ASTM F844)
3	[ASME] ASME B 18.21.1 - 2009 (R2016)	Plain Washers - Type B (ASTM F844)
4	[DIN EN] DIN EN 28738 - 1992	Plain Washers for Clevis Pins; Product Grade A;
5	[DIN EN ISO] DIN EN ISO 7089 - 2000	Plain washers - Normal series - Product grade A
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8	[ANSI] ANSI B 18.22.1 - 1965 (R1998)	Type B Plain Washers [Table 2] (ASTM A325 / ANSI 1060)
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