Washers provide a smooth bearing surface and are used under the head of a bolt and/or a nut. The chemical, mechanical, and dimensional requirements for hardened washers are covered under the ASTM specification F436. These washers are through hardened or carburized to add strength, but are physically smaller than a standard F844 flat washer. They are the recommended washer for any fastener other than a low carbon steel bolt.

Manufacturing

Portland Bolt has the ability to manufacture or provide nonstandard square, rectangular, or round washers meeting the requirements of ASTM A36, A572 Grade 50, or F436.

Stock

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

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

Extra Thick Washer Dimensions

Bolt Size B A C Weight (lbs) Per 1000pcs Part Numbers
Outside Diameter Inside Diameter Thickness Plain
Min Max
1⁄2 11⁄16 17⁄32 0.305 0.375 32 11805
5⁄8 15⁄16 11⁄16 0.305 0.375 54 11806
3⁄4 115⁄32 13⁄16 0.305 0.375 63 11807
7⁄8 13⁄4 15⁄16 0.305 0.375 120 11808
1 2 11⁄16 0.305 0.375 160 11809
11⁄8 21⁄4 13⁄16 0.305 0.375 245 11810
11⁄4 21⁄2 13⁄8 0.305 0.375 300 11811
13⁄8 23⁄4 11⁄2 0.305 0.375 368 11812
11⁄2 3 15⁄8 0.305 0.375 440 11813
*F436 defines dimensions for extra thick washers up to 4” diameter, but sizes larger than 1-1/2” often need to be custom manufactured.
*Some extra thick washers available in the marketplace are not made to these dimensions. Care should be taken to specify 5/16” thick washers when 5/16” thick washers are required per AISC.

Other Washer Dimensions

Also available in the marketplace are large OD hardened washers, in both standard thickness and extra thick pattern. These washers are made with the same OD as F844 washers, but the same hardness as F436 washers. Washers with these dimensions are not specifically covered by F436, but they are available and can be used when larger OD hardened washers are needed.