Heavy Hex Nuts

Heavy Hex Nuts are washer faced, are slightly larger Heavy Hex Nutsand thicker than standard hex nuts. The heavy hex pattern is typically used for large diameter and high strength bolts.

Finish:  Plain & Galvanized

Grades:  A563 Grade A,C,C3,DH,DH3 & A194 Grade 2H

Sizes: 1/2″ up to 4″ diameter

Domestic or Foreign are available and in stock!

Note: Galvanized nuts are always tapped over-size to accommodate for the extra thickness added by the galvanizing process.

Heavy Hex Nut Dimensions

Nominal Width Across Flats (F)Width Across Corners (C)Heavy Hex Nut Thickness (H)
SizeBasicMax MinMax MinBasicMax Min
1/41/20.5000.4880.5770.55615/640.2500.218
5/169/160.5620.5460.6500.62219/640.3140.280
3/811/160.6880.6690.7940.76323/640.3770.341
7/163/40.7500.7280.8660.83027/640.4410.403
1/27/80.8750.8501.0100.96931/640.5040.464
9/1615/160.9380.9091.0831.03735/640.5680.526
5/81 1/161.0621.0311.2271.17539/640.6310.587
3/41 1/41.2501.2121.4431.38247/640.7580.710
7/81 7/161.4381.3941.6601.58955/640.8850.833
11 5/81.6251.5751.8761.79663/641.0120.956
1 1/81 13/161.8121.7562.0932.0021 7/641.1391.079
1 1/422.0001.9382.3092.2091 7/321.2511.187
1 3/82 3/162.1882.1192.5262.4161 11/321.3781.310
1 1/22 3/82.3752.3002.7422.6221 15/321.5051.433
1 5/82 9/162.5622.4812.9592.8281 19/321.6321.556
1 3/42 3/42.7502.6623.1753.0351 23/321.7591.679
1 7/82 15/162.9382.8443.3923.2421 27/321.8861.802
23 1/83.1253.0253.6083.4491 31/322.0131.925
2 1/43 1/23.5003.3884.0413.8622 13/642.2512.155
2 1/23 7/83.8753.7504.4744.2752 29/642.5052.401
2 3/44 1/44.2504.1124.9074.6882 45/642.7592.647
34 5/84.6254.4755.3405.1022 61/643.0132.893
3 1/455.0004.8385.7745.5153 3/163.2523.124
3 1/25 3/85.3755.2006.2075.9283 7/163.5063.370
3 3/45 3/45.7505.5626.6406.3413 11/163.7603.616
46 1/86.1255.9257.0736.7553 15/164.0143.862

Table X1.1 Nut Compatibility Chart

Grade of BoltFinishNominal SizeA563 Grade and ANSI Nut Style
RecommendedSuitable
HexHeavy HexHexHeavy Hex
A307 Grade A & CAny1/4 to 1-1/2A-B,D,DHA,B,C,D,DH,DH3
A307 Grade A & CAny>1-1/2 to 2-AAC,D,DH,DH3
A307 Grade A & CAny>2 to 4-A-C,D,DH,DH3
A307 Grade BAny1/4 to 1-1/2-AB,D,DH B,C,D,DH,DH3
A307 Grade BAny>1-1/2 to 2-AA-
A307 Grade BAny>2 to 4-A--
A325 Type 1Plain1/2 - 1-1/2-C-C3, D, DH, DH3
A325 Type 1Galvanized1/2 - 1-1/2-DH--
A325 Type 3Plain1/2 - 1-1/2-C3-DH3
A354 Grade BCPlain1/4 to 1-1/2-C-C3, D, DH, DH3
A354 Grade BCPlain>1-1/2 to 4-C-C3, D, DH, DH3
A354 Grade BCGalvanized1/4 to 1-1/2-DH--
A354 Grade BCGalvanized>1-1/2 to 4-DH--
A354 Grade BDPlain1/4 to 1-1/2-DH-D, DH, DH3
A354 Grade BDPlain>1-1/2 to 4-DH-DH3
A449Plain1/4 to 1-1/2B-D, DHB,C,D,DH,DH3
A449Plain>1-1/2 to 3-A-C,C3,D,DH,DH3
A449Galvanized1/4 to 1-1/2-DHD, DHD
A449Galvanized>1-1/2 to 3-DH-D
A490 Type 1Plain1/2 - 1-1/2-DH-DH3
A490 Type 3Plain1/2 - 1-1/2-DH3--
A687Plain5/8 - 3-DH-DH, DH3
A687Galvanized5/8 - 3-DH3--
F1554 Grade 55Plain1/4 to 1-1/2A-B,D,DH A,B,C,D,DH,DH3
F1554 Grade 55Plain>1-1/2 to 4-A-C,D,DH,DH3
F1554 Grade 55Galvanized1/4 to 4-A-C,D,DH,DH3
F1554 Grade 105Plain1/4 to 1-1/2D--DH, DH3
F1554 Grade 105Plain>1-1/2 to 3-DH-DH3
F1554 Grade 105Galvanized1/4 to 3-DH-DH3
Source: ASTM A563-07a Appendix X1

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