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Product Overview
ASTM A325 bolts are high-strength, heavy hex structural bolts manufactured from medium carbon steel, quenched and tempered to achieve superior mechanical properties. Designed specifically for structural steel connections, these bolts are widely used in steel buildings, bridges, and other civil engineering projects. ASTM A325 bolts are available in Type 1 (carbon steel), Type 2 (withdrawn), and Type 3 (weathering steel) variants, with Type 1 being the most common.
These bolts are engineered to provide reliable clamping force and shear resistance in critical load-bearing applications. They are supplied with heavy hex nuts and hardened washers, conforming to ASTM A563 and ASTM F436, respectively. ASTM A325 bolts are specified for slip-critical and bearing-type connections in accordance with AISC and RCSC guidelines.
| Material | Medium Carbon Steel, Quenched & Tempered |
| ASTM Grade | A325 (Type 1, Type 3) |
| UNS Number | K10430 (Type 1) |
| DIN Number | 1.1181 (Type 1) |
| Material Standard | ASTM A325 |
| Bolt Standard (Metric) | ISO 898-1 Class 8.8 |
| Bolt Standard (Inch) | ASME B18.2.6 |
| Thread Form | UNC (Unified Coarse) |
| Diameter Range | 1/2"-1-1/2" (M12-M36) |
| Tensile Strength | 830 MPa (120 ksi) min |
| Yield Strength | 660 MPa (95 ksi) min |
| Hardness | 24-38 HRC |
Complete the Fastener Set
Technical Data
| Nominal Size (in) | Thread Pitch (UNC) | Head Width (A/F, in) | Head Height (in) | Min Length (in) | Max Length (in) |
|---|---|---|---|---|---|
| 1/2 | 13 | 7/8 | 0.344 | 1 | 6 |
| 5/8 | 11 | 1-1/16 | 0.430 | 1-1/4 | 8 |
| 3/4 | 10 | 1-1/4 | 0.516 | 1-1/2 | 10 |
| 7/8 | 9 | 1-7/16 | 0.602 | 1-3/4 | 10 |
| 1 | 8 | 1-5/8 | 0.688 | 2 | 10 |
| 1-1/8 | 7 | 1-13/16 | 0.773 | 2-1/4 | 10 |
| 1-1/4 | 7 | 2 | 0.859 | 2-1/2 | 10 |
| 1-3/8 | 6 | 2-3/16 | 0.945 | 2-3/4 | 10 |
| 1-1/2 | 6 | 2-3/8 | 1.031 | 3 | 10 |
| Standard | Covers | Thread |
|---|---|---|
| ASME B18.2.6 | Heavy hex structural bolts | UNC |
| ASTM A325 | Mechanical & chemical requirements | UNC |
| ASTM A563 | Heavy hex nuts | UNC |
| ASTM F436 | Hardened washers | - |
| ISO 898-1 | Metric property class 8.8 | Metric |
| Material Standard | Requirement |
|---|---|
| ASTM A325 | Structural bolts |
| ASTM A563 | Heavy hex nuts |
| ASTM F436 | Hardened washers |
| EN 10204 3.1 | Mill test certificate |
| EN 10204 3.2 | TPI-witnessed MTC |
Material Chemistry
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.30% max |
| Manganese (Mn) | 0.60-0.90% |
| Phosphorus (P) | 0.048% max |
| Sulfur (S) | 0.058% max |
| Silicon (Si) | 0.15-0.30% |
| Copper (Cu) | 0.35% max |
| Nickel (Ni) | 0.25% max |
| Chromium (Cr) | 0.04% max |
| Molybdenum (Mo) | 0.10% max |
Fastener Performance
| Bolt Size | Dry (Nm) | Lubricated (Nm) | Clamp Load (kN) |
|---|---|---|---|
| 1/2" | 120 | 95 | 38 |
| 5/8" | 230 | 185 | 61 |
| 3/4" | 410 | 330 | 90 |
| 7/8" | 660 | 530 | 125 |
| 1" | 990 | 790 | 181 |
| 1-1/8" | 1400 | 1120 | 246 |
| 1-1/4" | 1980 | 1580 | 318 |
| 1-3/8" | 2700 | 2160 | 405 |
| 1-1/2" | 3550 | 2840 | 509 |
Industry Applications
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