ASTM A325 Specification
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The ASTM A325 specification covers high strength heavy hex structural bolts from 1/2″ diameter through 1-1/2″ diameter. These bolts are intended for use in structural connections and therefore have shorter thread lengths than standard hex bolts. This specification is applicable to heavy hex structural bolts only.
ASTM A325 cover Specification for heavy Hex Bolts for for Structural Applications including Medium carbon, carbon boron, or medium carbon alloy steel grade Type 1 & Weathering steel Type 3. JF Engg provides additional coating as required.We Also Offer Customized thread Length for these Specification bolts.
For quick Quote/Information on A325 Bolts/Studs, please Contact Us
A325 Types
| TYPE 1 | Medium carbon, carbon boron, or medium carbon alloy steel. |
|---|---|
| TYPE 2 | Withdrawn November 1991. |
| TYPE 3 | Weathering steel. |
| T | Fully threaded A325. (Restricted to 4 times the diameter in length) |
| M | Metric A325. |
A325 Connection Types
| SC | Slip critical connection. |
|---|---|
| N | Bearing type connection with threads included in the shear plane. |
| X | Bearing-type connection with threads excluded from the shear plane. |
A325 Mechanical Properties
Size |
Tensile, ksi |
Yield, ksi |
Elong. %, min |
RA %, min |
|---|---|---|---|---|
1/2 - 1 |
120 min |
92 min |
14 |
35 |
1-1/8 - 1-1/2 |
105 min |
81 min |
14 |
35 |
A325 Chemical Properties
Type 1 Bolts |
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|---|---|---|---|---|
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 |
* |
* |
||
* Steel, as defined by the American Iron and Steel Institute, shall be considered to be alloy when the maximum range given for the content of alloying elements exceeds one of more of the following limits: Manganese, 1.65%, silicon, 0.60%, copper, 0.60%, or in which a definite range or a minimum quantity of any of the following elements is specified or required within the limits of the recognized field of constructional alloy steels: aluminum, chromium up to 3.99%, cobalt, columbium, molybdenum, nickel, titanium, tungsten, vanadium, zirconium or any other alloying elements added to obtain a desired alloying effect. |
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| Type 3 Bolts, Class * | ||||||
|---|---|---|---|---|---|---|
| ELEMENT | A | B | C | D | E | F |
| Carbon | 0.33 - 0.40% | 0.38 - 0.48% | 0.15 - 0.25% | 0.15 - 0.25% | 0.20 - 0.25% | 0.20 - 0.25% |
| Manganese | 0.90 - 1.20% | 0.70 - 0.90% | 0.80 - 1.35% | 0.40 - 1.20% | 0.60 - 1.00% | 0.90 - 1.20% |
| Phosphorus, max | 0.035% max | 0.06 - 0.12% | 0.035% max | 0.035% max | 0.035% max | 0.035% max |
| Sulfur, max | 0.040% | 0.040% | 0.040% | 0.040% | 0.040% | 0.040% |
| Silicon | 0.15 - 0.35% | 0.30 - 0.50% | 0.15 - 0.35% | 0.25 - 0.50% | 0.15 - 0.35% | 0.15 - 0.35% |
| Copper | 0.25 - 0.45% | 0.20 - 0.4% | 0.20 - 0.5% | 0.30 - 0.50% | 0.30 - 0.60% | 0.20 - 0.40% |
| Nickel | 0.25 - 0.45% | 0.50 - 0.80% | 0.25 - 0.50% | 0.50 - 0.80% | 0.30 - 0.60% | 0.20 - 0.40% |
| Chromium | 0.45 - 0.65% | 0.50 - 0.75% | 0.30 - 0.50% | 0.50 - 1.00% | 0.60 - 0.90% | 0.45 - 0.65% |
| Vanadium | 0.020% min | |||||
| Molybdenum | 0.06% max | 0.10% max | ||||
| Titanium | 0.05% max | |||||
A325 Recommended Hardware
Nuts |
Washers |
|||
|---|---|---|---|---|
Type 1 |
Type 3 |
Type 1 |
Type 3 |
|
Plain |
Galvanized |
Plain |
||
A563C, C3, D, DH, DH3 |
A563DH |
A563C3, DH3 |
F436-1 |
F436-3 |
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