Heavy Hex Nuts

Heavy Hex Nuts A563 A194 F594

Heavy hex nuts are slightly larger and thicker than standard (finished) hex nuts. There are numerous grades and the heavy pattern is typically used for large diameter and high strength bolts. See our nut compatibility chart to determine the compatible heavy hex nut(s) for a specific grade of bolt. Since hot-dip galvanizing typically adds 2.2 to 5 mils of thickness to the threaded portion of a fastener, galvanized heavy hex nuts are tapped oversize to compensate for the corrosion resistant coating on the bolts.

Heavy Hex Nuts

Heavy Hex Nuts

Diameters: 3/8″ – 2-3/4″
Origin: Domestic and import
Finish: Plain and hot-dip galvanized
Grades: A563 (grades A, C, and DH), A194 grade 2H

Dimensions

Bolt Diam.FCHWeight
(lbs.)
Part Numbers
Width Across FlatsWidth Across CornersThicknessA563AA1942HA563DH
ImportDomesticImportDomestic
BasicMaxMinMaxMinBasicMaxMinPlainGalv.PlainGalv.PlainGalv.PlainGalv.
12780.8750.8501.0100.96931640.5040.4640.07117291173016356117611176218345
5811161.0621.0311.2271.17539640.6310.5870.1211731117321635816359117631176418346
341141.2501.2121.4431.38247640.7580.7100.2011733117341636016361117651176618347
7817161.4381.3941.6601.58955640.8850.8330.3011735117361636216363117671176818348
11581.6251.5751.8761.79663641.0120.9560.4311737117381636416365117691177018349
118113161.8121.7562.0932.00217641.1391.0790.59117391174016366117711177216367
11422.0001.9382.3092.20917321.2511.1870.79117411174216370117731177416371
13823162.1882.1192.5262.416111321.3781.3101.02117431174416374117751177616375
1122382.3752.3002.7422.622115321.5051.4331.31117451174616378117771177816379
15829162.5622.4812.9592.828119321.6321.5561.621775017751163801638111779117801638016381
1342342.7502.6623.1753.035123321.7591.6792.041174711748163841638512549125501638416385
178215162.9382.8443.3923.242127321.8861.8022.411943319434
23183.1253.0253.6083.449131322.0131.9252.991174911750163901639111783117841639016391
2143123.5003.3884.0413.862213642.2512.1554.191175111752163961639712681126821639616397
2123783.8753.7504.4744.275229642.5052.4015.641175311754163981639912553125541639816399
2344144.2504.1124.9074.688245642.7592.6477.3815864 16041164001640112555125561640016401
34584.6254.4755.3405.102261643.0132.8939.501586316042164021640312601126021640216403
31455.0004.8385.7745.51533163.2523.12411.9418395
3125385.3755.2006.2075.92837163.5063.37015.2618495
3345345.7505.5626.6406.341311163.7603.61618.12
46186.1255.9257.0736.755315164.0143.86221.80117551175616404164051640416405
Dimensions per ASME B18.2.2 1987 (1999)
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