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ASTM A325 Bolts

ASTM A325 Bolts

ASTM A325 Structural Bolts

ASTM A325 covers high strength structural bolts used in structural steel connections. A325s have a heavy hex head, a full body diameter, and are normally short in overall length since they are connecting steel to steel. Unlike other ASTM grades, A325 is specific not only in the chemical and mechanical requirements, but also in the allowed configuration. These bolts are available in a wide sizes in diameter from 1/2" through 1-1/2" and are produced from a medium-carbon or medium-carbon alloy steel material that is quenched and tempered to develop the desired mechanical properties.

Types of ASTM A325 Structural Bolts

ASTM A325 heavy hex structural bolts may be specified in three different types, one of which is no longer available, or as “T” or “M”. 

  • Type 1 ASTM A325 heavy hex structural bolts– Medium carbon, carbon boron, or medium carbon alloy steel which undergoes a heat treating operation to achieve the desired mechanical properties. Type 1 is most commonly specified and is likely most readily available in the marketplace. The head is a heavy hex pattern and these bolts will have a set thread length based on the diameter required.
  • Type 2 ASTM A325 heavy hex structural bolts – This type was withdrawn in November of 1991.
  • Type 3 ASTM A325 heavy hex structural bolts – Weathering steel, quenched and tempered. Although the strength is the same as  Type 1, Type 3 bolts are made from weathering steel which contains copper, chromium and nickel. This forms an oxide coating which protects the base material from corroding.
  • A325T heavy hex structural bolts – Fully threaded A325. A325T bolts are available up to four times the diameter in length. A325s longer that this will need to be specially made per ASTM F3125 Grade A325.
  • A325M heavy hex structural bolts – Metric sized A325s.

ASTM F3125
ASTM F3125 is a specification covering the chemical, physical and mechanical requirements for structural bolts and will eventually replace all six ASTM structural bolt standards, including A325.

ASTM A325 Structural Bolts Dimensions

(Dimensions per ASME B18.2.6 2011).

Diameters Allowed: 1/2" – 1-1/2"
Available Lengths: Up to 6" – 10" maximum (depending on diameter)
Available  Finish: Plain Finish or Hot Dip Galvanized
Origin: Import or Domestic

ASTM A325 Bolt Length Tolerances

Nominal Length, in. Nominal Size, in.
1⁄2 5⁄8 3⁄4 thru 1 11⁄8 thru 11⁄2
Thru 6 in. -0.12 -0.12 -0.19 -0.25
Over 6 in. -0.19 -0.25 -0.25 -0.25

ASTM A325 Structural Bolt Dimensions

ASTM A325 Structural Bolt Dimensions

ASME B18.2.6 2011, A325 heavy hex bolts

Bolt Diameter D F C H T
Body Diameter Width Across Flats Width Across Corners Height Thread Length
Max Basic Max Min Max Min Basic Max Min Basic
1⁄2 0.515 7⁄8 0.875 0.850 1.010 0.969 5⁄16 0.323 0.302 1.00
5⁄8 0.642 11⁄16 1.062 1.031 1.227 1.175 25⁄64 0.403 0.378 1.25
3⁄4 0.768 11⁄4 1.250 1.212 1.443 1.383 15⁄32 0.483 0.455 1.38
7⁄8 0.895 17⁄16 1.438 1.394 1.660 1.589 35⁄64 0.563 0.531 1.50
1 1.022 15⁄8 1.625 1.575 1.876 1.796 39⁄64 0.627 0.591 1.75
11⁄8 1.149 113⁄16 1.812 1.756 2.093 2.002 11⁄16 0.718 0.658 2.00
11⁄4 1.277 2 2.00 1.938 2.309 2.209 25⁄32 0.813 0.749 2.00
13⁄8 1.404 23⁄16 2.188 2.119 2.526 2.416 27⁄32 0.878 0.810 2.25
11⁄2 1.531 23⁄8 2.375 2.300 2.742 2.622 15⁄16 0.974 0.902 2.25

Dimensions per ASME B18.2.6 2011

A325 Chemical Properties

Type 1 Bolts
Element Carbon Steel Carbon Boron Steel Alloy Steel Alloy Boron Steel
Carbon 0.30 – 0.52% 0.30 – 0.52% 0.30 – 0.52% 0.30 – 0.52%
Manganese, min 0.60% 0.60% 0.60% 0.60%
Phosphorus, max 0.040% 0.040% 0.035% 0.035%
Sulfur, max 0.050% 0.050% 0.040% 0.040%
Silicon 0.15-0.30% 0.10 – 0.30% 0.15 – 0.35% 0.15 – 0.35%
Boron 0.0005 – 0.003% 0.0005 – 0.003%
Alloying Elements * *

A325 Alternatives

A325 Mechanical Properties

Size Tensile, ksi Yield, ksi Elong. %, min RA %, min
1⁄2 – 1 120 min 92 min 14 35
11⁄8 – 11⁄2 105 min 81 min 14 35

ASTM A449

Mechanically and chemically, A449 is virtually identical to A325

Size Tensile, ksi Yield, ksi Elong. %, min RA %, min
1⁄4 – 1 120 min 92 min 14 35
11⁄8 – 11⁄2 105 min 81 min 14 35
15⁄8 – 3 90 min 58 min 14 35

SAE J429 Grade 5

SAE J429 Grade 5 fasteners are typically used in the automotive industry or OEM type applications, but much like ASTM A449, are very similar mechanically and chemically to ASTM A325.

Size Tensile, ksi Yield, ksi Elong %, min RA %, min
1⁄4 thru 1 120 min 92 min 14 35
Over 1 thru 11⁄2 105 min 81 min 14 35
Types
  • Type : 1, 2, 3, T, M
  • Connection: SC, N, X
  • ASTM F3125 Grade A325
Dimensions
  • Stock sizes
  • Length tolerances
  • Bolt dimensions
Properties
  • Mechanical Requirements
  • Chemical Requirements
Alternatives
  • Similar Grades
  • Other Configurations
  • F3125 Requirements
Hardware
  • Nuts
  • Washers
  • Load Indicating Washers
Manufacturing
  • Cold Forging
  • Hot Forging
  • Testing & Certification

ASTM A325 BOLTS PRICE IN INDIA

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