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Hardened Round Washers

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The primary function of washers is to provide a smooth, uniform bearing surface. Washers are generally installed at the base of a nut or bolt head to distribute load and protect the connection surface.

The chemical, mechanical, and dimensional requirements for hardened washers are covered under ASTM Specification F436. These washers are fully hardened and carburized to enhance strength and performance. Although they are physically smaller than standard ASTM F844 flat washers, they offer superior load resistance.

Except for applications involving low carbon steel bolts, ASTM F436 hardened washers are the recommended choice for use with most structural and high-strength fasteners.

Stock

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

Dimensions

 
Click table to show drawing
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