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 SizeBACWeight (lbs.) Per 1000 PiecesPart Numbers
Outside DiameterInside DiameterThicknessDomestic
MinMaxPlainGalvanized
1⁄211⁄1617⁄320.0970.177181644016441
5⁄815⁄1611⁄160.1220.177331644216443
3⁄4115⁄3213⁄160.1220.177411644416445
7⁄813⁄415⁄160.1360.177641644616447
1211⁄160.1360.177821644816449
11⁄821⁄413⁄160.1360.1771051645016451
11⁄421⁄213⁄80.1360.1771331645216453
13⁄823⁄411⁄20.1360.1771631645416455
11⁄2315⁄80.1360.1772001645616457
15⁄831⁄413⁄40.1780.2832019481*19482*
13⁄433⁄817⁄80.1780.283071645816459
17⁄831⁄220.1780.2836016471*16472
233⁄421⁄80.1780.283801646016461
21⁄4423⁄80.240.345601646216463
21⁄241⁄225⁄80.240.347201646416465
23⁄4527⁄80.240.349201661116612
351⁄231⁄80.240.3410401661316614
31⁄4633⁄80.240.341350--
31⁄261⁄235⁄80.240.3416331849018460
33⁄4737⁄80.240.341880--
471⁄241⁄80.240.3422001846118462
Dimensions per ASTM F436
*Usually domestic

Extra Thick Washer Dimensions

Bolt SizeBACWeight (lbs) Per 1000pcsPart Numbers
Outside DiameterInside DiameterThicknessPlain
MinMax
1⁄211⁄1617⁄320.3050.3753211805
5⁄815⁄1611⁄160.3050.3755411806
3⁄4115⁄3213⁄160.3050.3756311807
7⁄813⁄415⁄160.3050.37512011808
1211⁄160.3050.37516011809
11⁄821⁄413⁄160.3050.37524511810
11⁄421⁄213⁄80.3050.37530011811
13⁄823⁄411⁄20.3050.37536811812
11⁄2315⁄80.3050.37544011813
*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.