Hex Nuts & Jam Nuts

Hex Nuts or Finished Hex Nuts are manufactured to the A563, A194 or F594 (Stainless Steel) specifications. Domestic and Import in Stock

Notes: As per the A563 spec“The requirements for any grade of nut may, at the supplier’s option, and with notice to the purchaser, be fulfilled by furnishing nuts of one of the stronger grades specified herein unless such a substitution is barred in the inquiry and purchase order”. The reason this provision was added to the A563 specification is due to the overall availability of some nut grades & finishes. This is particularly important when substituting A194 2H nuts in place of A563 DH nuts because of overall in larger size nuts, generally 3/4″ and above.  

Jam Nuts shorter in height than a standard hex nut, hex jam nuts have the same measurements across the widths and flats. They can be used to run up against a hex nut to lock the hex nut in place or as a leveling nut, among other uses. Imports 3/4″ and over in stock, domestic available for 1-1/2 and over on special order.

Grades A563, A194 & F594 (Stainless)

Finish: Plain (black) & Galvanized

Click on pictures for a closer look!


Hex & Jam Nut Dimensions and Weights

DiameterWidth Across FlatsAcross Corners (C)Thickness Hex NutsHex NutThickness Jam NutsJam Nut
Inch(F) BasicMaxMin(H) Basiclbs/100(h) Basiclbs/100
3/41 1/81.2991.24041/6411.927/6412
7/81 5/161.5161.4473/41931/6417.6

A194 Nut Compatibility Chart

Grade of BoltA194 Heavy Hex Nut Grade
A193 Grade B72H
A193 Grade B8 (Class 1 and 2)8
A320 Grade L74 or 7
A320 Grade B8 (Class 1 and 2)8

Table X1.1 Nut Suitability Chart

Grade of BoltFinishNominal SizeA563 Grade and ANSI Nut Style
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 A563-15 Appendix X1


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