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- Type 2 ASTM A325 heavy hex structural bolts – This type was withdrawn in November of 1991.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
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 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
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