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Product Overview
ASTM A325 nuts are high-strength, heavy hex structural nuts manufactured to complement ASTM A325 structural bolts in critical steel construction applications. Produced from medium carbon steel, these nuts are heat-treated to achieve the mechanical properties required for high-load, slip-critical, and tensioned bolted connections in bridges, buildings, and other steel structures.
ASTM A325 nuts are designed for use with A325 bolts and are dimensionally compatible with heavy hex profiles per ASME B18.2.2. They are available in plain, hot-dip galvanized, and mechanically galvanized finishes, ensuring reliable performance in both indoor and outdoor environments. All nuts are supplied with full traceability and certification to ASTM A563 or A194, as specified.
| Material | Medium Carbon Steel |
| ASTM Nut Standard | ASTM A563 / ASTM A194 |
| Nut Grade | A563 DH / A194 2H |
| Nut Type | Heavy Hex |
| Nut Standard (Metric) | ISO 4032 / DIN 934 |
| Nut Standard (Inch) | ASME B18.2.2 |
| Thread Form | UNC / UNF / Metric Coarse |
| Size Range | 1/2"-1-1/2" (M12-M36) |
| Proof Load | 175 ksi (1207 MPa) min |
| Hardness | Rockwell C24-C38 |
| Finish | Plain / Hot Dip Galvanized / Mechanical Galvanized |
Complete the Fastener Set
Technical Data
| Nominal Size (in) | Width Across Flats (in) | Height (in) | Thread Pitch (UNC) |
|---|---|---|---|
| 1/2 | 0.875 | 0.500 | 13 |
| 5/8 | 1.062 | 0.640 | 11 |
| 3/4 | 1.250 | 0.750 | 10 |
| 7/8 | 1.438 | 0.875 | 9 |
| 1 | 1.625 | 1.000 | 8 |
| 1-1/8 | 1.812 | 1.125 | 7 |
| 1-1/4 | 2.000 | 1.250 | 7 |
| 1-3/8 | 2.188 | 1.375 | 6 |
| 1-1/2 | 2.375 | 1.500 | 6 |
| Size (M) | Width Across Flats (mm) | Height (mm) | Thread Pitch (mm) |
|---|---|---|---|
| M12 | 18 | 10 | 1.75 |
| M16 | 24 | 13 | 2.0 |
| M20 | 30 | 16 | 2.5 |
| M24 | 36 | 19 | 3.0 |
| M30 | 46 | 24 | 3.5 |
| M36 | 55 | 29 | 4.0 |
| Standard | Covers | Thread |
|---|---|---|
| ASME B18.2.2 | Heavy hex nuts (inch) | UNC/UNF |
| ISO 4032 | Hex nuts (metric) | Metric |
| DIN 934 | Hex nuts (metric) | Metric |
| ASTM A563 | Carbon/alloy steel nuts | UNC/UNF |
| ASTM A194 | High-temp nuts | UNC/UNF |
| Material Standard | Requirement |
|---|---|
| ASTM A563 DH | Heavy hex, high-strength |
| ASTM A194 2H | Heavy hex, high-temp |
| ASTM F2329 | Hot-dip galvanizing |
| EN 10204 3.1 | Mill test certificate |
| EN 10204 3.2 | TPI-witnessed MTC |
Material Chemistry
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.55% max |
| Manganese (Mn) | 0.60-1.35% |
| Phosphorus (P) | 0.04% max |
| Sulfur (S) | 0.05% max |
| Silicon (Si) | 0.15-0.35% |
| Copper (Cu) | 0.20% max |
| Other Elements | Residuals as per standard |
Fastener Performance
| Nut Size | Proof Load (kN) | Recommended Torque (Nm) |
|---|---|---|
| 1/2" | 53 | 135 |
| 5/8" | 85 | 270 |
| 3/4" | 124 | 480 |
| 7/8" | 170 | 780 |
| 1" | 225 | 1200 |
| 1-1/8" | 290 | 1700 |
| 1-1/4" | 360 | 2400 |
| 1-3/8" | 440 | 3200 |
| 1-1/2" | 530 | 4100 |
Industry Applications
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