Flat Plain ANSI Washer Size Dimension Chart
Size, dimensional and tolerance data given is for Type B Plain Flat Washers, ANSI/ASME B18.22.1 (R1998).
N = Narrow, R = Regular, W = Wide series
Nominal Washer Sizea |
Seriesb |
Inside Dia. |
Outside Dia. |
Thickness |
|||||||
Nom. |
Tolerance |
Nom. |
Tolerance |
||||||||
Nom. |
Max. |
Min. |
|||||||||
Plus |
Minus |
Plus |
Minus |
||||||||
No. 0 |
0.060 |
N |
0.068 |
0.000 |
0.005 |
0.125 |
0.000 |
0.005 |
0.025 |
0.028 |
0.022 |
R |
0.068 |
0.000 |
0.005 |
0.188 |
0.000 |
0.005 |
0.025 |
0.028 |
0.022 |
||
W |
0.068 |
0.000 |
0.005 |
0.250 |
0.000 |
0.005 |
0.025 |
0.028 |
0.022 |
||
No. 1 |
0.073 |
N |
0.084 |
0.000 |
0.005 |
0.156 |
0.000 |
0.005 |
0.025 |
0.028 |
0.022 |
R |
0.084 |
0.000 |
0.005 |
0.219 |
0.000 |
0.005 |
0.025 |
0.028 |
0.022 |
||
W |
0.084 |
0.000 |
0.005 |
0.281 |
0.000 |
0.005 |
0.032 |
0.036 |
0.028 |
||
No. 2 |
0.086 |
N |
0.094 |
0.000 |
0.005 |
0.188 |
0.000 |
0.005 |
0.025 |
0.028 |
0.022 |
R |
0.094 |
0.000 |
0.005 |
0.250 |
0.000 |
0.005 |
0.032 |
0.036 |
0.028 |
||
W |
0.094 |
0.000 |
0.005 |
0.344 |
0.000 |
0.005 |
0.032 |
0.036 |
0.028 |
||
No. 3 |
0.099 |
N |
0.109 |
0.000 |
0.005 |
0.219 |
0.000 |
0.005 |
0.025 |
0.028 |
0.022 |
R |
0.109 |
0.000 |
0.005 |
0.312 |
0.000 |
0.005 |
0.032 |
0.036 |
0.028 |
||
W |
0.109 |
0.008 |
0.005 |
0.406 |
0.008 |
0.005 |
0.040 |
0.045 |
0.036 |
||
No. 4 |
0.112 |
N |
0.125 |
0.000 |
0.005 |
0.250 |
0.000 |
0.005 |
0.032 |
0.036 |
0.028 |
R |
0.125 |
0.008 |
0.005 |
0.375 |
0.008 |
0.005 |
0.040 |
0.045 |
0.036 |
||
W |
0.125 |
0.008 |
0.005 |
0.438 |
0.008 |
0.005 |
0.040 |
0.045 |
0.036 |
||
No. 5 |
0.125 |
N |
0.141 |
0.000 |
0.005 |
0.281 |
0.000 |
0.005 |
0.032 |
0.036 |
0.028 |
R |
0.141 |
0.008 |
0.005 |
0.406 |
0.008 |
0.005 |
0.040 |
0.045 |
0.036 |
||
W |
0.141 |
0.008 |
0.005 |
0.500 |
0.008 |
0.005 |
0.040 |
0.045 |
0.036 |
||
No. 6 |
0.138 |
N |
0.156 |
0.000 |
0.005 |
0.312 |
0.000 |
0.005 |
0.032 |
0.036 |
0.028 |
R |
0.156 |
0.008 |
0.005 |
0.438 |
0.008 |
0.005 |
0.040 |
0.045 |
0.036 |
||
W |
0.156 |
0.008 |
0.005 |
0.562 |
0.008 |
0.005 |
0.040 |
0.045 |
0.036 |
||
No. 8 |
0.164 |
N |
0.188 |
0.008 |
0.005 |
0.375 |
0.008 |
0.005 |
0.040 |
0.045 |
0.036 |
R |
0.188 |
0.008 |
0.005 |
0.500 |
0.008 |
0.005 |
0.040 |
0.045 |
0.036 |
||
W |
0.188 |
0.008 |
0.005 |
0.625 |
0.015 |
0.005 |
0.063 |
0.071 |
0.056 |
||
No. 10 |
0.190 |
N |
0.203 |
0.008 |
0.005 |
0.406 |
0.008 |
0.005 |
0.040 |
0.045 |
0.036 |
R |
0.203 |
0.008 |
0.005 |
0.562 |
0.008 |
0.005 |
0.040 |
0.045 |
0.036 |
||
W |
0.203 |
0.008 |
0.005 |
0.734c |
0.015 |
0.007 |
0.063 |
0.071 |
0.056 |
||
No. 12 |
0.216 |
N |
0.234 |
0.008 |
0.005 |
0.438 |
0.008 |
0.005 |
0.040 |
0.045 |
0.036 |
R |
0.234 |
0.008 |
0.005 |
0.625 |
0.015 |
0.005 |
0.063 |
0.071 |
0.056 |
||
W |
0.234 |
0.008 |
0.005 |
0.875 |
0.015 |
0.007 |
0.063 |
0.071 |
0.056 |
||
1⁄4 |
0.250 |
N |
0.281 |
0.015 |
0.005 |
0.500 |
0.015 |
0.005 |
0.063 |
0.071 |
0.056 |
R |
0.281 |
0.015 |
0.005 |
0.015 |
0.007 |
0.063 |
0.071 |
0.056 |
|||
W |
0.281 |
0.015 |
0.005 |
1.000 |
0.015 |
0.007 |
0.063 |
0.071 |
0.056 |
||
5⁄16 |
0.312 |
N |
0.344 |
0.015 |
0.005 |
0.625 |
0.015 |
0.005 |
0.063 |
0.071 |
0.056 |
R |
0.344 |
0.015 |
0.005 |
0.875 |
0.015 |
0.007 |
0.063 |
0.071 |
0.056 |
||
W |
0.344 |
0.015 |
0.005 |
1.125 |
0.015 |
0.007 |
0.063 |
0.071 |
0.056 |
||
3⁄8 |
0.375 |
N |
0.406 |
0.015 |
0.005 |
0.015 |
0.007 |
0.063 |
0.071 |
0.056 |
|
R |
0.406 |
0.015 |
0.005 |
1.000 |
0.015 |
0.007 |
0.063 |
0.071 |
0.056 |
||
W |
0.406 |
0.015 |
0.005 |
1.250 |
0.030 |
0.007 |
0.100 |
0.112 |
0.090 |
||
7⁄16 |
0.438 |
N |
0.469 |
0.015 |
0.005 |
0.875 |
0.015 |
0.007 |
0.063 |
0.071 |
0.056 |
R |
0.469 |
0.015 |
0.005 |
1.125 |
0.015 |
0.007 |
0.063 |
0.071 |
0.056 |
||
W |
0.469 |
0.015 |
0.005 |
0.030 |
0.007 |
0.100 |
0.112 |
0.090 |
|||
1⁄2 |
0.500 |
N |
0.531 |
0.015 |
0.005 |
1.000 |
0.015 |
0.007 |
0.063 |
0.071 |
0.056 |
R |
0.531 |
0.015 |
0.005 |
1.250 |
0.030 |
0.007 |
0.100 |
0.112 |
0.090 |
||
W |
0.531 |
0.015 |
0.005 |
1.750 |
0.030 |
0.007 |
0.100 |
0.112 |
0.090 |
||
9⁄16 |
0.562 |
N |
0.594 |
0.015 |
0.005 |
1.125 |
0.015 |
0.007 |
0.063 |
0.071 |
0.056 |
R |
0.594 |
0.015 |
0.005 |
0.030 |
0.007 |
0.100 |
0.112 |
0.090 |
|||
W |
0.594 |
0.015 |
0.005 |
2.000 |
0.030 |
0.007 |
0.100 |
0.112 |
0.090 |
||
5⁄8 |
0.625 |
N |
0.656 |
0.030 |
0.007 |
1.250 |
0.030 |
0.007 |
0.100 |
0.112 |
0.090 |
R |
0.656 |
0.030 |
0.007 |
1.750 |
0.030 |
0.007 |
0.100 |
0.112 |
0.090 |
||
W |
0.656 |
0.030 |
0.007 |
2.250 |
0.030 |
0.007 |
0.160 |
0.174 |
0.146 |
Nom. Washer Size |
Series |
Inside Diameter |
Outside Diameter |
Thickness |
|||||||
Nom. |
Tolerance |
Nom. |
Tolerance |
Nom. |
Max. |
Min. |
|||||
Plus |
Minus |
Plus |
Minus |
||||||||
3/4 |
0.750 |
N |
0.812 |
0.030 |
0.007 |
1.375 |
0.030 |
0.007 |
0.100 |
0.112 |
0.090 |
R |
0.812 |
0.030 |
0.007 |
2.000 |
0.030 |
0.007 |
0.100 |
0.112 |
0.090 |
||
W |
0.812 |
0.030 |
0.007 |
2.500 |
0.030 |
0.007 |
0.160 |
0.174 |
0.146 |
||
7/8 |
0.875 |
N |
0.938 |
0.030 |
0.007 |
1.469 |
0.030 |
0.007 |
0.100 |
0.112 |
0.090 |
R |
0.938 |
0.030 |
0.007 |
2.250 |
0.030 |
0.007 |
0.160 |
0.174 |
0.146 |
||
W |
0.938 |
0.030 |
0.007 |
2.750 |
0.030 |
0.007 |
0.160 |
0.174 |
0.146 |
||
1 |
1.000 |
N |
1.062 |
0.030 |
0.007 |
1.750 |
0.030 |
0.007 |
0.100 |
0.112 |
0.090 |
R |
1.062 |
0.030 |
0.007 |
2.500 |
0.030 |
0.007 |
0.160 |
0.174 |
0.146 |
||
W |
1.062 |
0.030 |
0.007 |
3.000 |
0.030 |
0.007 |
0.160 |
0.174 |
0.146 |
||
1-1/8 |
1.125 |
N |
1.188 |
0.030 |
0.007 |
2.000 |
0.030 |
0.007 |
0.100 |
0.112 |
0.090 |
R |
1.188 |
0.030 |
0.007 |
2.750 |
0.030 |
0.007 |
0.160 |
0.174 |
0.146 |
||
W |
1.188 |
0.030 |
0.007 |
3.250 |
0.030 |
0.007 |
0.160 |
0.174 |
0.146 |
||
1-1/4 |
1.250 |
N |
1.312 |
0.030 |
0.007 |
2.250 |
0.030 |
0.007 |
0.160 |
0.174 |
0.146 |
R |
1.312 |
0.030 |
0.007 |
3.000 |
0.030 |
0.007 |
0.160 |
0.174 |
0.146 |
||
W |
1.312 |
0.030 |
0.007 |
3.500 |
0.045 |
0.010 |
0.250 |
0.266 |
0.234 |
||
1-3/8 |
1.375 |
N |
1.438 |
0.030 |
0.007 |
2.500 |
0.030 |
0.007 |
0.160 |
0.174 |
0.146 |
R |
1.438 |
0.030 |
0.007 |
3.250 |
0.030 |
0.007 |
0.160 |
0.174 |
0.146 |
||
W |
1.438 |
0.030 |
0.007 |
3.750 |
0.045 |
0.010 |
0.250 |
0.266 |
0.234 |
||
1-1/2 |
1.500 |
N |
1.562 |
0.030 |
0.007 |
2.750 |
0.030 |
0.007 |
0.160 |
0.174 |
0.146 |
R |
1.562 |
0.045 |
0.010 |
3.500 |
0.045 |
0.010 |
0.250 |
0.266 |
0.234 |
||
W |
1.562 |
0.045 |
0.010 |
4.000 |
0.045 |
0.010 |
0.250 |
0.266 |
0.234 |
||
1-5/8 |
1.625 |
N |
1.750 |
0.030 |
0.007 |
3.000 |
0.030 |
0.007 |
0.160 |
0.174 |
0.146 |
R |
1.750 |
0.045 |
0.010 |
3.750 |
0.045 |
0.010 |
0.250 |
0.266 |
0.234 |
||
W |
1.750 |
0.045 |
0.010 |
4.250 |
0.045 |
0.010 |
0.250 |
0.266 |
0.234 |
||
1-3/4 |
1.750 |
N |
1.875 |
0.030 |
0.007 |
3.250 |
0.030 |
0.007 |
0.160 |
0.174 |
0.146 |
R |
1.875 |
0.045 |
0.010 |
4.000 |
0.045 |
0.010 |
0.250 |
0.266 |
0.234 |
||
W |
1.875 |
0.045 |
0.010 |
4.500 |
0.045 |
0.010 |
0.250 |
0.266 |
0.234 |
||
1-7/8 |
1.875 |
N |
2.000 |
0.045 |
0.010 |
3.500 |
0.045 |
0.010 |
0.250 |
0.266 |
0.234 |
R |
2.000 |
0.045 |
0.010 |
4.250 |
0.045 |
0.010 |
0.250 |
0.266 |
0.234 |
||
W |
2.000 |
0.045 |
0.010 |
4.250 |
0.045 |
0.010 |
0.250 |
0.266 |
0.234 |
||
2 |
2.000 |
N |
2.125 |
0.045 |
0.010 |
3.750 |
0.045 |
0.010 |
0.250 |
0.266 |
0.234 |
R |
2.125 |
0.045 |
0.010 |
4.500 |
0.045 |
0.010 |
0.250 |
0.266 |
0.234 |
||
W |
2.125 |
0.045 |
0.010 |
5.000 |
0.045 |
0.010 |
0.250 |
0.266 |
0.234 |
a Nominal washer sizes are intended for use with comparable nominal screw or bolt sizes.
b N indicates Narrow; R, Regular; and W, Wide Series.
c The 0.734-inch and 1.469-inch outside diameter avoids washers which could be used in coin operated devices.
All dimensions are in inches. Inside and outside diameters shall be concentric within at least the inside diameter tolerance.
Washers shall be flat within 0.005-inch for basic outside diameters up through 0.875-inch and within 0.010 inch for larger outside diameters.
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