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| ASTM Standard | A325 Type 1 |
| Tensile Strength | 830-1035 MPa |
| Yield Strength (min) | 635 MPa |
| Hardness | 24-35 HRC |
| Density | 7.85 g/cm³ |
| Max Service Temp | 230°C |
| Element | Composition (%) |
|---|---|
| C | 0.30–0.52 |
| Mn | 0.60–1.20 |
| P | ≤0.040 |
| S | ≤0.050 |
| B | trace (if alloy) |
ASTM A325 fasteners are manufactured from medium carbon boron steel, with controlled additions of carbon, manganese, and boron that enhance hardenability during quench and temper heat treatment. Boron improves core hardness in larger diameters, while manganese contributes to strength and toughness balance. Chromium and molybdenum may be present in trace amounts to refine grain structure and support uniform mechanical properties across bolt sizes, ensuring consistent performance in structural steel connections.
These alloying elements combine to deliver high tensile strength, reliable yield performance, and excellent fatigue resistance, making A325 fasteners ideal for structural bolting in bridges, buildings, and heavy steel frameworks. The quenched and tempered microstructure provides superior clamping force retention under cyclic and static loads. Although not stainless, protective zinc or mechanical galvanizing coatings enhance corrosion resistance in outdoor environments. Their proven mechanical reliability, cost-effectiveness, and compliance with structural codes make them the preferred choice for high-strength structural joints requiring dependable, long-term performance.
Specifications
ASTM A325 Fasteners are high-strength structural fastening components defined by standardized mechanical properties and dimensional tolerances, with technical data covering thread form, size range, and load-bearing requirements for bolted steel connections in demanding construction and fabrication applications under ASTM A325 specifications.
| Tensile Strength | 830-1035 MPa |
| Yield Strength | 635 MPa min |
| Elongation | 14% min |
| Reduction of Area | 35% min |
| Hardness | 24-35 HRC |
| Modulus of Elasticity | 200 GPa |
| Thermal Expansion | 11.9 µm/m·°C |
| Thermal Conductivity | 46 W/m·K |
| Density | 7.85 g/cm³ |
| Heat Treatment | Quenched & Tempered |
| Max Service Temperature | 230°C |
| Bolt Standard | ASTM A325 Type 1/2/3 |
| Stud Bolt Standard | ASTM A325 Continuous Thread |
| Nut Standard | ASTM A563 DH |
| Washer Standard | ASTM F436 |
| Thread Form | UNC / UN Series |
| Diameter Range | 1/2 in to 1-1/2 in |
| Length Range | 1 in to 8 in |
| Available Forms | Hex Bolts, Studs, Nuts, Washers |
| Custom Sizes | Available on request |
| Inspection Standard | ASTM F606 / RCSC Specification |
Applications
