Washers offer a smooth bearing surface. They are typically at the base of the head of a bolt/nut. The mechanical, chemical, and dimensional requirements in terms of hardened washers seem to be covered under ASTM specification F436. While these washers are thoroughly hardened / carburized in order to add strength, they are physically smaller compared to standard F844 flat washers. Excluding low carbon steel bolts, hardened washers are the recommended washers for any other fastener.

Stock

Diameters: 1/2″ – 2-3/4″
Origin: Domestic
Finish: Plain and hot-dip galvanized

Dimensions

Click table to show drawingWasher
Bolt Size B A C Weight (lbs.) Per 1000 Pieces Part Numbers
Outside Diameter Inside Diameter Thickness Domestic
Min Max Plain Galvanized
1⁄2 11⁄16 17⁄32 0.097 0.177 18 16440 16441
5⁄8 15⁄16 11⁄16 0.122 0.177 33 16442 16443
3⁄4 115⁄32 13⁄16 0.122 0.177 41 16444 16445
7⁄8 13⁄4 15⁄16 0.136 0.177 64 16446 16447
1 2 11⁄16 0.136 0.177 82 16448 16449
11⁄8 21⁄4 13⁄16 0.136 0.177 105 16450 16451
11⁄4 21⁄2 13⁄8 0.136 0.177 133 16452 16453
13⁄8 23⁄4 11⁄2 0.136 0.177 163 16454 16455
11⁄2 3 15⁄8 0.136 0.177 200 16456 16457
15⁄8 31⁄4 13⁄4 0.178 0.28 320 19481* 19482*
13⁄4 33⁄8 17⁄8 0.178 0.28 307 16458 16459
17⁄8 31⁄2 2 0.178 0.28 360 16471* 16472
2 33⁄4 21⁄8 0.178 0.28 380 16460 16461
21⁄4 4 23⁄8 0.24 0.34 560 16462 16463
21⁄2 41⁄2 25⁄8 0.24 0.34 720 16464 16465
23⁄4 5 27⁄8 0.24 0.34 920 16611 16612
3 51⁄2 31⁄8 0.24 0.34 1040 16613 16614
31⁄4 6 33⁄8 0.24 0.34 1350 - -
31⁄2 61⁄2 35⁄8 0.24 0.34 1633 18490 18460
33⁄4 7 37⁄8 0.24 0.34 1880 - -
4 71⁄2 41⁄8 0.24 0.34 2200 18461 18462
Dimensions per ASTM F436
*Usually domestic