A325 Heavy Hex Bolt, Galvanized
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A325 Heavy Hex Bolt, Galvanized

ASTM F3125 Grade A325 heavy hex bolts are high strength structural bolts manufactured from medium carbon steel, carbon boron, or medium carbon alloy steel. 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 for grade A325 heavy hex bolts include 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.

Governing StandardsA325

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 A 325 or ASTM A 490; (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 F 959; (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.

A325 Head Marking
A325 Material Marking

Mechanical PropertiesA325

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

Chemical PropertiesA325

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

Dimensional SpecificationsA325

Heavy hex bolt dimensions
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.
A325 Heavy Hex Bolt, Galvanized
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Diameter Thread Pitch Length Threading Item # Availability Price Quantity UOM
1/2 13 1 1/4 Partial 325G0500125-I 3-5 Working Days $0.28202/EA EA
1/2 13 1 1/2 Partial 325G0500150-I In Stock $0.48766/EA EA
1/2 13 1 3/4 Partial 325G0500175-I In Stock $0.33083/EA EA
1/2 13 2 Partial 325G0500200-I In Stock $0.36068/EA EA
1/2 13 2 1/2 Partial 325G0500250-I In Stock $0.41112/EA EA
1/2 13 3 Partial 325G0500300-I In Stock $0.5643/EA EA
1/2 13 5 Partial 325G0500500-I In Stock $1.46353/EA EA
1/2 13 6 Partial 325G0500600-I In Stock $2.02115/EA EA
5/8 11 1 1/2 Partial 325G0620150-I In Stock $0.54994/EA EA
5/8 11 1 3/4 Partial 325G0620175-I In Stock $0.73995/EA EA
5/8 11 2 Partial 325G0620200-I In Stock $0.67939/EA EA
5/8 11 2 1/4 Partial 325G0620225-I In Stock $0.75217/EA EA
5/8 11 2 1/2 Partial 325G0620250-I In Stock $1.13723/EA EA
5/8 11 3 Partial 325G0620300-I In Stock $1.24263/EA EA
5/8 11 6 Partial 325G0620600-I In Stock $1.58402/EA EA
3/4 10 1 1/2 Partial 325G0750150-I In Stock $0.79833/EA EA
3/4 10 1 3/4 Partial 325G0750175-I In Stock $1.45692/EA EA
3/4 10 2 Partial 325G0750200-I In Stock $1.33535/EA EA
3/4 10 2 1/4 Partial 325G0750225-I In Stock $1.40738/EA EA
3/4 10 2 1/2 Partial 325G0750250-I In Stock $1.50169/EA EA
3/4 10 2 3/4 Partial 325G0750275-I In Stock $1.35709/EA EA
3/4 10 3 Partial 325G0750300-I In Stock $1.37387/EA EA
3/4 10 3 1/4 Partial 325G0750325-I 3-5 Working Days $1.54329/EA EA
3/4 10 3 1/2 Partial 325G0750350-I In Stock $1.54912/EA EA
3/4 10 3 3/4 Partial 325G0750375-I In Stock $1.48061/EA EA
3/4 10 4 Partial 325G0750400-I In Stock $1.78613/EA EA
3/4 10 4 1/2 Partial 325G0750450-I In Stock $3.02966/EA EA
3/4 10 5 Partial 325G0750500-I 3-5 Working Days $7.33403/EA EA
7/8 9 1 3/4 Partial 325G0870175-I In Stock $1.39835/EA EA
7/8 9 2 Partial 325G0870200-I In Stock $1.47669/EA EA
7/8 9 2 1/4 Partial 325G0870225-I In Stock $1.85749/EA EA
7/8 9 2 1/2 Partial 325G0870250-I In Stock $2.83694/EA EA
7/8 9 2 3/4 Partial 325G0870275-I In Stock $3.0181/EA EA
7/8 9 3 Partial 325G0870300-I In Stock $3.03112/EA EA
7/8 9 3 1/2 Partial 325G0870350-I In Stock $2.10179/EA EA
7/8 9 3 3/4 Partial 325G0870375-I In Stock $2.422/EA EA
7/8 9 4 Partial 325G0870400-I In Stock $2.06275/EA EA
1 8 2 1/4 Partial 325G1000225-I In Stock $1.94125/EA EA
1 8 2 1/2 Partial 325G1000250-I In Stock $2.46491/EA EA
1 8 2 3/4 Partial 325G1000275-I In Stock $2.48266/EA EA
1 8 3 Partial 325G1000300-I In Stock $2.63161/EA EA
1 8 3 1/4 Partial 325G1000325-I In Stock $2.78052/EA EA
1 8 3 1/2 Partial 325G1000350-I 3-5 Working Days $3.01401/EA EA
1 8 4 Partial 325G1000400-I In Stock $3.43925/EA EA
1 8 4 1/4 Partial 325G1000425-I In Stock $4.08644/EA EA
1 8 4 1/2 Partial 325G1000450-I In Stock $4.07076/EA EA
1 8 4 3/4 Partial 325G1000475-I In Stock $4.11375/EA EA
1 8 6 Partial 325G1000600-I In Stock $5.46886/EA EA
1 1/4 7 3 1/2 Partial 325G1250350-I In Stock $7.22242/EA EA
1 1/4 7 4 Partial 325G1250400-I In Stock $8.05753/EA EA
1 1/4 7 4 1/2 Partial 325G1250450-I In Stock $8.32635/EA EA
1 1/4 7 4 3/4 Partial 325G1250475-I In Stock $9.3302/EA EA