ASTM A394 is a standard material specification covering chemical and mechanical requirements of hexagon and square-head atmospheric corrosion-resistant bolts, made from quenched and tempered weathering steel, in nominal thread diameters of 1⁄2, 5⁄8, 3⁄4, 7⁄8 and 1 in. for use in the construction of transmission towers, substations, and similar steel structures.
Find chemical composition, mechanical properties, shear strength, marking, recommended nuts, surface finish or coating and other reference standards for ASTM A394 Type 3 Bolts.
| Element | Grade Type 3 |
|---|---|
| Carbon | 0.15 – 0.25 |
| Manganese, max | 0.80 – 1.35 |
| Phosphorus, max | 0.035 max |
| Sulfur, max | 0.040 max |
| Silicon | 0.15 – 0.35 |
| Copper | 0.20 – 0.50 |
| Nickel | 0.25 – 0.50 |
| Chromium | 0.30 – 0.50 |
| Vanadium | 0.02 min |
| Nominal size, Inch. | Minimum Tensile Load, lbf | Hardness |
|---|---|---|
| Type 3 | Type 3 | |
| 1/2 | 17 050 | 25 – 34 Rockwell C |
| 5/8 | 27 100 | |
| 3/4 | 40 100 | |
| 7/8 | 55 450 | |
| 1 | 72 700 |
| Grade | Nut Grade | Coating |
|---|---|---|
| Type 3 | A563 Grade DH3 | Plain |
| ASTM A563 | Specification for Carbon and Alloy Steel Nuts |
| ASTM F436 | Specification for Hardened Steel Washers |
| ASTM F2329 | Specification for Zinc Coating, Hot-Dip |
| ASME B1.1 | Unified Screw Threads |
| ASME B18.2.1 | Square and Hex Bolts and Screws |