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

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
12 1116 1732 0.097 0.177 18 16440 16441
58 1516 1116 0.122 0.177 33 16442 16443
34 11532 1316 0.122 0.177 41 16444 16445
78 134 1516 0.136 0.177 64 16446 16447
1 2 1116 0.136 0.177 82 16448 16449
118 214 1316 0.136 0.177 105 16450 16451
114 212 138 0.136 0.177 133 16452 16453
138 234 112 0.136 0.177 163 16454 16455
112 3 158 0.136 0.177 200 16456 16457
158 314 134 0.178 0.28 320 19481* 19482*
134 338 178 0.178 0.28 307 16458 16459
178 312 2 0.178 0.28 360 16471* 16472
2 334 218 0.178 0.28 380 16460 16461
214 4 238 0.24 0.34 560 16462 16463
212 412 258 0.24 0.34 720 16464 16465
234 5 278 0.24 0.34 920 16611 16612
3 512 318 0.24 0.34 1040 16613 16614
314 6 338 0.24 0.34 1350 - -
312 612 358 0.24 0.34 1633 18490 18460
334 7 378 0.24 0.34 1880 - -
4 712 418 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
12 1116 1732 0.305 0.375 32 11805
58 1516 1116 0.305 0.375 54 11806
34 11532 1316 0.305 0.375 63 11807
78 134 1516 0.305 0.375 120 11808
1 2 1116 0.305 0.375 160 11809
118 214 1316 0.305 0.375 245 11810
114 212 138 0.305 0.375 300 11811
138 234 112 0.305 0.375 368 11812
112 3 158 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.