Blog
  2. Fasteners
  3. Washers
  4. ASME B18.22 1 Type A Plain Washers

ASME B18.22.1 Type A Plain Washers

ASME B18.22.1 standard covers two types of general purpose plain washers designated as Type A.
The inclusion of dimensional data in ASME B18.22.1 standard is not intended to imply that all of the products described herein are production items. Consumers are requested to consult with manufacturers concerning lists of stock production sizes.

ASME B18.22 1 Type A Plain Washers

ASME B18.22.1 Type A Plain Washers Dimensions (mm)

Nominal Size Series Inside Diameter, A Outside Diameter, B Thickness, C
Basic Max. Min. Basic Max. Min. Basic Max. Min.
#0 ... ... 1.981 4.775 4.648 4.775 1.143 0.101 0.508 0.635 0.406
#2 ... ... 2.387 6.35 6.223 6.35 1.143 0.101 0.508 0.635 0.406
#4 ... ... 3.175 8.128 7.797 7.924 1.828 0.177 0.812 1.016 0.635
#6 0.138 ... 3.962 9.906 9.398 9.525 2.895 0.33 1.244 1.651 0.914
#8 0.164 ... 4.775 11.506 10.998 11.125 2.895 0.33 1.244 1.651 0.914
#10 0.19 ... 5.562 13.081 12.573 12.7 2.895 0.33 1.244 1.651 0.914
3/16 0.188 ... 6.35 14.655 14.147 14.274 2.895 0.33 1.244 1.651 0.914
#12 0.216 ... 6.35 14.655 14.147 14.274 3.683 0.355 1.651 2.032 1.295
1/4 0.25 Narrow 7.137 16.256 15.748 15.875 3.683 0.355 1.651 2.032 1.295
1/4 0.25 Wide 7.924 19.024 18.465 18.643 3.683 0.355 1.651 2.032 1.295
5/16 0.312 Narrow 8.737 17.856 17.297 17.475 3.683 0.355 1.651 2.032 1.295
5/16 0.312 Wide 9.525 22.987 22.047 22.225 4.749 0.482 2.108 2.641 1.625
3/8 0.375 Narrow 10.312 21.005 20.447 20.624 3.683 0.355 1.651 2.032 1.295
3/8 0.375 Wide 11.125 26.162 25.222 25.4 4.749 0.482 2.108 2.641 1.625
7/16 0.438 Narrow 11.912 23.799 23.241 23.418 3.683 0.355 1.651 2.032 1.295
7/16 0.438 Wide 12.7 32.512 31.572 31.75 4.749 0.482 2.108 2.641 1.625
1/2 0.5 Narrow 13.487 27.736 26.797 26.974 5.486 0.533 2.413 3.073 1.879
1/2 0.5 Wide 14.274 35.687 34.747 34.925 6.121 0.584 2.768 3.352 2.184
9/16 0.562 Narrow 15.087 30.124 29.184 29.362 5.486 0.533 2.413 3.073 1.879
9/16 0.562 Wide 15.875 38.074 37.134 37.312 6.121 0.584 2.768 3.352 2.184
5/8 0.625 Narrow 16.662 34.086 33.147 33.324 5.486 0.533 2.413 3.073 1.879
5/8 0.625 Wide 17.475 45.212 44.272 44.45 7.467 0.66 3.403 4.064 2.743
3/4 0.75 Narrow 20.624 38.074 37.134 37.312 7.467 0.66 3.403 4.064 2.743
3/4 0.75 Wide 20.624 51.562 50.622 50.8 8.255 0.66 3.759 4.495 3.098
7/8 0.875 Narrow 23.825 45.212 44.272 44.45 7.467 0.66 3.403 4.064 2.743
7/8 0.875 Wide 23.825 57.912 56.972 57.15 9.067 0.736 4.191 4.876 3.454
1 1 Narrow 26.974 51.562 50.622 50.8 7.467 0.66 3.403 4.064 2.743
1 1 Wide 26.974 64.262 63.322 63.5 9.067 0.736 4.191 4.876 3.454
1 1/8 1.125 Narrow 31.75 57.912 56.972 57.15 7.467 0.66 3.403 4.064 2.743
1 1/8 1.125 Wide 31.75 70.612 69.672 69.85 9.067 0.736 4.191 4.876 3.454
1 1/4 1.25 Narrow 34.925 64.262 63.322 63.5 9.067 0.736 4.191 4.876 3.454
1 1/4 1.25 Wide 34.925 76.962 76.022 76.2 9.067 0.736 4.191 4.876 3.454
1 3/8 1.375 Narrow 38.1 70.612 69.672 69.85 9.067 0.736 4.191 4.876 3.454
1 3/8 1.375 Wide 38.1 83.693 82.296 82.55 9.982 0.685 4.572 5.41 3.886
1 1/2 1.5 Narrow 41.275 76.962 76.022 76.2 9.067 0.736 4.191 4.876 3.454
1 1/2 1.5 Wide 41.275 90.043 88.646 88.9 9.982 0.685 4.572 5.41 3.886
1 5/8 1.625 ... 44.45 96.393 94.996 95.25 9.982 0.685 4.572 5.41 3.886
1 3/4 1.75 ... 47.625 102.743 101.346 101.6 9.982 0.685 4.572 5.41 3.886
1 7/8 1.875 ... 50.8 109.093 107.696 107.95 9.982 0.685 4.572 5.41 3.886
2 2 ... 53.975 115.443 114.046 114.3 9.982 0.685 4.572 5.41 3.886
2 1/4 2.25 ... 60.325 121.793 120.396 120.65 11.887 0.685 5.588 6.299 4.902
2 1/2 2.5 ... 66.675 128.143 126.746 127 13.157 0.711 6.045 7.112 5.334
2 3/4 2.75 ... 73.025 135.001 133.096 133.35 14.452 0.787 6.578 7.874 5.791
3 3 ... 79.375 141.351 139.446 139.7 15.519 0.889 7.213 8.305 6.324

ASME B18.22.1 Type A Plain Washers Dimensions (Inch)

Nominal Size Series Inside Diameter, A Outside Diameter, B Thickness, C
Basic Max. Min. Basic Max. Min. Basic Max. Min.
#0 ... ... 0.078 0.188 0.183 0.188 0.045 0.004 0.020 0.025 0.016
#2 ... ... 0.094 0.250 0.245 0.250 0.045 0.004 0.020 0.025 0.016
#4 ... ... 0.125 0.320 0.307 0.312 0.072 0.007 0.032 0.040 0.025
#6 0.138 ... 0.156 0.390 0.370 0.375 0.114 0.013 0.049 0.065 0.036
#8 0.164 ... 0.188 0.453 0.433 0.438 0.114 0.013 0.049 0.065 0.036
#10 0.19 ... 0.219 0.515 0.495 0.500 0.114 0.013 0.049 0.065 0.036
3/16 0.188 ... 0.250 0.577 0.557 0.562 0.114 0.013 0.049 0.065 0.036
#12 0.216 ... 0.250 0.577 0.557 0.562 0.145 0.014 0.065 0.080 0.051
1/4 0.25 Narrow 0.281 0.640 0.620 0.625 0.145 0.014 0.065 0.080 0.051
1/4 0.25 Wide 0.312 0.749 0.727 0.734 0.145 0.014 0.065 0.080 0.051
5/16 0.312 Narrow 0.344 0.703 0.681 0.688 0.145 0.014 0.065 0.080 0.051
5/16 0.312 Wide 0.375 0.905 0.868 0.875 0.187 0.019 0.083 0.104 0.064
3/8 0.375 Narrow 0.406 0.827 0.805 0.812 0.145 0.014 0.065 0.080 0.051
3/8 0.375 Wide 0.438 1.030 0.993 1.000 0.187 0.019 0.083 0.104 0.064
7/16 0.438 Narrow 0.469 0.937 0.915 0.922 0.145 0.014 0.065 0.080 0.051
7/16 0.438 Wide 0.500 1.280 1.243 1.250 0.187 0.019 0.083 0.104 0.064
1/2 0.5 Narrow 0.531 1.092 1.055 1.062 0.216 0.021 0.095 0.121 0.074
1/2 0.5 Wide 0.562 1.405 1.368 1.375 0.241 0.023 0.109 0.132 0.086
9/16 0.562 Narrow 0.594 1.186 1.149 1.156 0.216 0.021 0.095 0.121 0.074
9/16 0.562 Wide 0.625 1.499 1.462 1.469 0.241 0.023 0.109 0.132 0.086
5/8 0.625 Narrow 0.656 1.342 1.305 1.312 0.216 0.021 0.095 0.121 0.074
5/8 0.625 Wide 0.688 1.780 1.743 1.750 0.294 0.026 0.134 0.160 0.108
3/4 0.75 Narrow 0.812 1.499 1.462 1.469 0.294 0.026 0.134 0.160 0.108
3/4 0.75 Wide 0.812 2.030 1.993 2.000 0.325 0.026 0.148 0.177 0.122
7/8 0.875 Narrow 0.938 1.780 1.743 1.750 0.294 0.026 0.134 0.160 0.108
7/8 0.875 Wide 0.938 2.280 2.243 2.250 0.357 0.029 0.165 0.192 0.136
1 1 Narrow 1.062 2.030 1.993 2.000 0.294 0.026 0.134 0.160 0.108
1 1 Wide 1.062 2.530 2.493 2.500 0.357 0.029 0.165 0.192 0.136
1 1/8 1.125 Narrow 1.250 2.280 2.243 2.250 0.294 0.026 0.134 0.160 0.108
1 1/8 1.125 Wide 1.250 2.780 2.743 2.750 0.357 0.029 0.165 0.192 0.136
1 1/4 1.25 Narrow 1.375 2.530 2.493 2.500 0.357 0.029 0.165 0.192 0.136
1 1/4 1.25 Wide 1.375 3.030 2.993 3.000 0.357 0.029 0.165 0.192 0.136
1 3/8 1.375 Narrow 1.500 2.780 2.743 2.750 0.357 0.029 0.165 0.192 0.136
1 3/8 1.375 Wide 1.500 3.295 3.240 3.250 0.393 0.027 0.180 0.213 0.153
1 1/2 1.5 Narrow 1.625 3.030 2.993 3.000 0.357 0.029 0.165 0.192 0.136
1 1/2 1.5 Wide 1.625 3.545 3.490 3.500 0.393 0.027 0.180 0.213 0.153
1 5/8 1.625 ... 1.750 3.795 3.740 3.750 0.393 0.027 0.180 0.213 0.153
1 3/4 1.75 ... 1.875 4.045 3.990 4.000 0.393 0.027 0.180 0.213 0.153
1 7/8 1.875 ... 2.000 4.295 4.240 4.250 0.393 0.027 0.180 0.213 0.153
2 2 ... 2.125 4.545 4.490 4.500 0.393 0.027 0.180 0.213 0.153
2 1/4 2.25 ... 2.375 4.795 4.740 4.750 0.468 0.027 0.220 0.248 0.193
2 1/2 2.5 ... 2.625 5.045 4.990 5.000 0.518 0.028 0.238 0.280 0.210
2 3/4 2.75 ... 2.875 5.315 5.240 5.250 0.569 0.031 0.259 0.310 0.228
3 3 ... 3.125 5.565 5.490 5.500 0.611 0.035 0.284 0.327 0.249

ASME Material Specifications

ASTM A693 Washers
ASTM F436/F436M Washers
ASTM F959/959M Direct Tension Squirter DTI Washers
ASTM F2437/2437M Direct Tension Squirter DTI Washers
ASTM F844 Washers
ISO 898-3 Washers
ASTM A36 Washers
ASTM A240 Washers, Spacer, Flange
ASTM B96 Washers
ASTM B127 Washers
ASTM B162 Washers
ASTM B168 Washers
ASTM B171 Washers
ASTM B265 Washers
ASTM B409 Washers
ASTM B424 Washers
ASTM B551 Washers
ASTM B708 Washers

EN Material Specifications

ISO Material Specifications