Washers provide a smooth bearing surface and are used under the head of a bolt and/or a nut. Flat washers are covered under the ASTM specification F844. These washers are unhardened and intended for general use.
Chemical Requirements
Washers shall be steel, and unless otherwise specified, are not furnished to any chemical composition requirements.
Mechanical Properties
Unless otherwise specified, F844 washers are not furnished to any mechanical requirements.
Dimensional Requirements
Washers are typically supplied per ASME B18.2.1, standard flat washer dimensions.
Bolt Size |
A |
B |
C |
Weight (lbs.) Per 100 Pieces |
Inside Diameter |
Outside Diameter |
Thickness |
||
1⁄2 |
9⁄16 |
13⁄8 |
0.109 |
4 |
5⁄8 |
11⁄16 |
13⁄4 |
0.134 |
8 |
3⁄4 |
13⁄16 |
2 |
0.148 |
11 |
7⁄8 |
15⁄16 |
21⁄4 |
0.165 |
15 |
1 |
11⁄16 |
21⁄2 |
0.165 |
19 |
11⁄8 |
11⁄4 |
23⁄4 |
0.165 |
22 |
11⁄4 |
13⁄8 |
3 |
0.165 |
26 |
13⁄8 |
11⁄2 |
31⁄4 |
0.180 |
33 |
11⁄2 |
15⁄8 |
31⁄2 |
0.180 |
38 |
15⁄8 |
13⁄4 |
33⁄4 |
0.180 |
43 |
13⁄4 |
17⁄8 |
4 |
0.180 |
50 |
17⁄8 |
2 |
41⁄4 |
0.180 |
57 |
2 |
21⁄8 |
41⁄2 |
0.180 |
63 |
21⁄4 |
23⁄8 |
43⁄4 |
0.220 |
83 |
21⁄2 |
25⁄8 |
5 |
0.238 |
96 |
23⁄4 |
27⁄8 |
51⁄4 |
0.259 |
110 |
3 |
31⁄8 |
51⁄2 |
0.284 |
130 |