Table 2: Heavy Hex Nut Selection Guidelines
(dimensions in inches)
Bolt or Stud Nut
ASTM
Spec
Grade or
Type

Description

Size

Coating
Suitable Grades
ASTM A563
Suitable Nut
Style
Notes
(See below)
A307 Grade A or C Bolts and Studs 1/4 to 1-1/2  Plain, Zinc  A  Hex  
1-1/2 to 4 Plain, Zinc A Heavy Hex  
A307 Grade B Bolts and Studs 1/4 to 4 Plain, Zinc A Heavy Hex  
A325 Type 1 Structural Bolts 1/2 to 1-1/2 Plain C, C3, D, DH, DH3 Heavy Hex A
1/2 to 1-1/2 Zinc DH Heavy Hex A
A325 Type 3 Structural Bolts 1/2 to 1-1/2 Plain C3, DH3 Heavy Hex A
A354 Grade BC Bolts and Studs 1/4 to 4 Plain C Heavy Hex A, B
1/4 to 4 Zinc DH Heavy Hex A, B
A354 Grade BD Bolts and Studs 1/4 to 4 Plain DH Heavy Hex A, C, D
A449 Type 1 or 2 Bolts and Studs 1/4 to 1-1/2 Plain B Hex A, B
over 1-1/2 to 3 Plain A Heavy Hex A, B
1/4 to 3 Zinc DH Heavy Hex A, C
A490 Type 1 or 2 Structural Bolts 1/2 to 1-1/2 Plain DH, DH3 Heavy Hex D
A490 Type 3 Structural Bolts 1/2 to 1-1/2 Plain DH3 Heavy Hex D
F1554 Grade 36 Anchor Bolts 1/4 to 1-1/2 Plain, Zinc A Hex E
over 1-1/2 to 4 Plain, Zinc A Heavy Hex E
F1554 Grade 55 Anchor Bolts 1/4 to 1-1/2 Plain A Hex E
over 1-1/2 to 4 Plain A Heavy Hex E
over 1/4 to 4 Zinc A Heavy Hex E
F1554 Grade 105 Anchor Bolts 1/4 to 1-1/2 Plain D Hex E
1/4 to 1-1/2 Zinc DH Heavy Hex E
1/4 to 3 Plain, Zinc DH Heavy Hex E

Notes

  1. Nuts of other grades and styles in ASTM A563 having specified proof load stresses greater than the grade and style of nut listed are also suitable.
  2. For nut selection purposes, fasteners with coatings that are not thick enough to require over-size tapped nuts are considered to be plain.
  3. For nut selection purposes, fasteners with any coating thick enough to require over-size tapped nuts are considered to be zinc coated.
  4. These fasteners are not normally supplied zinc coated due to risk of hydrogen embrittlement.
  5. Nuts of other grades and styles listed in ASTM A563 or A194 with proof load stress equal or greater than the minimum tensile strength of the anchor bolt are also suitable.
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