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A325 Heavy Hex Bolt W/Nut, Galvanized Us/Ca

Selected Strucutral A325 Heavy Hex Bolt With A563 DH Heavy Hex Nut Hot Dipped GalavanizedA325 Heavy Hex Bolt W/Nut, Galvanized US/CA
Strucutral A325 Heavy Hex Bolt With A563 DH Heavy Hex Nut Hot Dipped GalavanizedA325 Heavy Hex Bolt W/Nut, Galvanized US/CA

ASTM F3125 Grade A325 heavy hex bolts with nuts are high strength structural bolts manufactured from medium carbon steel, carbon boron, or medium carbon alloy steel. Fasteners listed below are melted and manufactured in the USA or Canada. A325 hex bolts are available in diameters from 1/2" through 1 1/2" inclusive. Dimensional specifications are governed by ASME B18.2.6. Grade markings consists of both the grade symbol "A325" and the manufacturer's identification mark. Inch series fasteners meeting ASTM F3125 Grade A325 specifications are intended for use in steel to steel structural connections. Grade A325 heavy hex bolts offer a heavy pattern head to increase the bearing surface and distribute the clamping load over a larger area. Available in hot dip galvanized finish, which provides a corrosion resistant zinc coating. One hot dip galvanized dyed & waxed A563 Grade DH heavy hex nut supplied per bolt, unassembled.

Products

Mechanical Properties

A325 Bolt: Alloy Steel, Quenched & Tempered Per ASTM F3125/F3125M-15a
Grade A325 Tensile
Strength		 Yield
Strength		 Elongation
in 4D		 Reduction
in Area
Min psi Min psi Min % Min %
Inch 120   ksi 120,000 92,000 14 35
DH Nut: Carbon & Alloy Steel Per ASTM A563-2015
Diameter Proof Load Stress Core Hardness
ksi   (1) Rockwell
Non-Zinc-
Coated (2)		 Zinc-
Coated (2)		 Min Max
1/4" thru 4" (3) 175 150 C24 C38
  1. 1. To determine nut proof load in pounds, multiply the appropriate nut proof load stress by the tensile stress area of the thread.
  2. 2. Non-zinc-coated nuts are nuts intended for use with externally threaded fasteners which have a plain (nonplated or noncoated) finish or have a plating or coating of insufficient thickness to necessitate overtapping the nut thread to provide assemblability. Zinc-coated nuts are nuts intended for use with externally threaded fasteners which are hot-dip zinc-coated, mechanically zinc-coated, or have a plating or coating of sufficient thickness to necessitate overtapping the nut thread to provide assemblability.
  3. 3. Nuts made in accordance with the requirements of Specification A194/A194M, Grade 2H, and marked with its grade symbol are an acceptable equivalent for Grade DH nuts. When A194 zinc-coated inch series nuts are supplied, the zinc coating, overtapping, lubrication and rotational capacity testing shall be in accordance with Specification A563.

Dimensional Specifications

Heavy hex bolt and DH nut dimensions
A325 Bolt Per ASME B18.2.6-2010
Nominal Diameter UNC UNF E F G H LT Y
Body Diameter Width Across Flats Width Across Corners Head Height Thread Length Transition Length
Max Min Basic Max Min Max Min Basic Max Min Ref Max
1/2 0.500 13 20 0.515 0.482 7/8 0.875 0.850 1.010 0.969 11/32 0.364 0.302 1.000 0.190
5/8 0.625 11 18 0.642 0.605 1 1/16 1.062 1.031 1.227 1.175 27/64 0.444 0.378 1.250 0.220
3/4 0.750 10 16 0.768 0.729 1 1/4 1.250 1.212 1.443 1.383 1/2 0.524 0.455 1.380 0.250
7/8 0.875 9 14 0.895 0.852 1 7/16 1.438 1.394 1.660 1.589 37/64 0.604 0.531 1.500 0.280
1 1.000 8 14 1.022 0.976 1 5/8 1.625 1.575 1.876 1.796 43/64 0.700 0.591 1.750 0.310
1 1/8 1.125 7 12 1.149 1.098 1 13/16 1.812 1.756 2.093 2.002 3/4 0.780 0.658 2.000 0.340
1 1/4 1.250 7 12 1.277 1.223 2 2.000 1.938 2.309 2.209 27/32 0.876 0.749 2.000 0.380
1 3/8 1.375 6 12 1.404 1.345 2 3/16 2.188 2.119 2.526 2.416 29/32 0.940 0.810 2.250 0.440
1 1/2 1.500 6 12 1.531 1.470 2 3/8 2.375 2.300 2.742 2.622 1 1.036 0.902 2.250 0.440
  1. All dimensions are in inches.
Heavy hex bolt and DH nut dimensions
DH Nut Per ASME B18.2.2-2015
Nominal Diameter UNC UNF UN8 Width Across Flats Width Across Corners Thickness
Basic Max Min Max Min Basic Max Min
1/4 0.250 20 28   1/2 0.500 0.488 0.577 0.556 15/64 0.250 0.218
5/16 0.313 18 24   9/16 0.562 0.546 0.650 0.220 19/64 0.314 0.280
3/8 0.375 16 24   11/16 0.688 0.669 0.794 0.763 23/64 0.377 0.341
7/16 0.438 14 20   3/4 0.750 0.728 0.866 0.830 27/64 0.441 0.403
1/2 0.500 13 20   7/8 0.875 0.850 1.010 0.990 31/64 0.504 0.464
9/16 0.563 12 18   15/16 0.938 0.909 1.083 1.037 35/64 0.568 0.526
5/8 0.625 11 18   1 1/16 1.062 1.031 1.227 1.175 39/64 0.631 0.587
3/4 0.750 10 16   1 1/4 0.250 1.212 1.443 1.382 47/64 0.758 0.710
7/8 0.875 9 14   1 7/16 1.438 1.394 1.660 1.589 55/64 0.885 0.833
1 1.000 8 14   1 5/8 1.625 1.575 1.876 1.796 63/64 1.012 0.956
1 1/8 1.125 7 12 8 1 13/16 1.812 1.756 2.093 2.002 1 7/64 1.139 1.079
1 1/4 1.250 7 12 8 2 2.000 1.380 2.309 2.209 1 7/32 1.251 1.187
1 3/8 1.375 6 12 8 2 3/16 2.188 2.119 2.526 2.416 1 11/32 1.378 1.310
1 1/2 1.500 6 12 8 2 3/8 2.375 2.300 2.742 2.622 1 15/32 1.505 1.433
1 5/8 1.625 5 1/2 12 8 2 9/16 2.562 2.481 2.959 2.828 1 19/32 1.632 1.556
1 3/4 1.750 5 12 8 2 3/4 2.750 2.662 3.175 3.035 1 23/32 1.759 1.679
1 7/8 1.875 5 12 8 2 15/16 2.938 2.844 3.392 3.242 1 27/32 1.886 1.802
2 2.000 4 1/2 12 8 3 1/8 3.125 3.025 3.608 3.449 1 31/32 2.013 1.925
2 1/4 2.250 4 1/2 12 8 3 1/2 3.500 3.388 4.041 3.862 2 13/64 2.251 2.155
2 1/2 2.500 4 12 8 3 7/8 3.875 3.750 4.474 4.275 2 29/64 2.505 2.401
2 3/4 2.750 4 12 8 4 1/4 4.250 4.112 4.907 4.688 2 45/64 2.759 2.647
3 3.000 4 12 8 4 5/8 4.625 4.475 5.340 5.102 2 61/64 3.013 2.893
3 1/4 3.250 4 12 8 5 5.000 4.838 5.774 5.515 3 3/16 3.252 3.124
3 1/2 3.500 4 12 8 5 3/8 5.375 5.200 6.207 5.928 3 7/16 3.506 3.370
3 3/4 3.750 4 12 8 5 3/4 5.750 5.562 5.562 6.341 3 11/16 3.670 3.616
4 4.000 4 12 8 6 1/8 6.125 5.925 5.925 6.755 3 15/16 4.014 3.862
  1. All dimensions are in inches.

Governing Standards

A325 Bolt
ASTM F3125 Covers the mechanical and material requirements for inch series fasteners used in automotive and related industries in diameters through 1-1/2″.
ASME B18.2.6 Covers the general and dimensional data for five products in the inch series recognized as American National Standard. These five structural products include: (a) Heavy Hex Structural Bolts: ASTM A325 or ASTM A490; (b) Heavy Hex Nuts: ASTM A 563; (c) Hardened Steel Washers; Circular, Circular Clipped or Beveled: ASTM F436; (d) Compressible Washer-Type Direct Tension Indicators: ASTM F959; (e) Twist-Off-Type Tension Control Structural Bolts: Heavy Hex and Round: ASTM F1852.
ASME B1.1 UNC & UNF Class 2A Specifies the thread form, series, class, allowance, tolerance, and designation for unified screw threads.
SC Slip Critical Connection
N Bearing type connection with threads in the shear plane.
X Bearing type connection with no threads in the shear plane.
DH Nut
ASTM A563 Covers the chemical and mechanical requirements for eight grades of carbon and alloy steel nuts for general structural and mechanical uses on bolts, studs, and other externally threaded parts.
ASME B18.2.2 Covers the complete general and dimensional data for the various types of inch series square and hex nuts, including machine screw nuts and coupling nuts.
ASME B1.1 UNC & UNF Class 2B Specifies the thread form, series, class, allowance, tolerance, and designation for unified screw threads.

A325 Head Markings
A325 Material Marking

Grade 5 Head Marking
DH Material Marking

Chemical Properties

A325 Bolt Per ASTM F3125/F3125M-15a
Grade Material Carbon Manganese Phosphorus Sulfur Silicon Boron
% by weight % by weight % by weight % by weight % by weight % by weight
A325 Type 1 Carbon or Alloy Steel with or without Boron 0.30-0.52 0.60 min 0.035 max 0.040 max 0.15-0.30 0.003 max
DH Nut Per ASTM A563-2015
Grade Material Carbon Manganese Phosphorus Sulfur
% by weight % by weight % by weight % by weight
DH (1) Carbon & Alloy Steel 0.20-0.55 0.60 0.04 0.05
  1. 1. For Grade DH a sulfur content of 0.05 – 0.15 % is acceptable provided the manganese is 1.35 % min.